v3.25.2
Condensed Consolidated Schedule of Investments (Parenthetical) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Schedule of Investments [Line Items]    
Percentage of portfolio above floor rate 89.80% 89.40%
Fair Value as % of Net Assets 210.80% 215.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance $ 13,092,518,000  
Ending balance $ 13,252,800,000 $ 13,092,518,000
Non-controlled/non-affiliated investments    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 210.30% [1],[2] 214.95% [3],[4]
Unfunded commitments $ 1,866,882,000 $ 1,707,094,000
Fair Value (5,955,000) (7,253,000)
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4] 13,063,171,000  
Ending balance $ 13,223,290,000 [1],[2] $ 13,063,171,000 [3],[4]
Non-controlled/affiliated investments    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.48% [1],[2] 0.48% [3],[4]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4] $ 29,347,000  
Ending balance 29,510,000 [1],[2] $ 29,347,000 [3],[4]
Non-controlled/affiliated investments | Blackstone Donegal Holdings LP    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance 6,403,000 5,790,000
Gross Additions 0 0
Gross Reductions 0 0
Net Change in Unrealized Gains (Losses) 334,000 613,000
Net Realized Gain (Loss) 0 0
Ending balance 6,737,000 6,403,000
Dividend and Interest Income 0 0
Non-controlled/affiliated investments | Material Holdings, LLC 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance 21,547,000 0
Gross Additions 865,000 21,384,000
Gross Reductions 0 0
Net Change in Unrealized Gains (Losses) (32,000) 163,000
Net Realized Gain (Loss) 0 0
Ending balance 22,380,000 21,547,000
Dividend and Interest Income 1,151,000 1,378,000
Non-controlled/affiliated investments | Material Holdings, LLC 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance 1,397,000 0
Gross Additions 148,000 5,114,000
Gross Reductions 0 0
Net Change in Unrealized Gains (Losses) (1,152,000) (3,717,000)
Net Realized Gain (Loss) 0 0
Ending balance 393,000 1,397,000
Dividend and Interest Income 0 314,000
Non-controlled/affiliated investments | Material+ Holding Company, LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance 0 0
Gross Additions 0 0
Gross Reductions 0 0
Net Change in Unrealized Gains (Losses) 0 0
Net Realized Gain (Loss) 0 0
Ending balance 0 0
Dividend and Interest Income 0 0
Affiliated investments    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance 29,347,000 5,790,000
Gross Additions 1,013,000 26,498,000
Gross Reductions 0 0
Net Change in Unrealized Gains (Losses) (850,000) (2,941,000)
Net Realized Gain (Loss) 0 0
Ending balance 29,510,000 29,347,000
Dividend and Interest Income $ 1,151,000 $ 1,692,000
Qualifying Assets    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 70.00% 70.00%
Non-qualifying Assets    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 14.60% 14.80%
Restricted Securities    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 210.76% 215.43%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance $ 13,092,500,000  
Ending balance 13,251,400,000 $ 13,092,500,000
Investment, Identifier [Axis]: 123Dentist, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[7],[8],[9]   0.03%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[7],[8],[9] $ 1,577,000  
Ending balance [3],[4],[5],[6],[7],[8],[9]   $ 1,577,000
Investment, Identifier [Axis]: 123Dentist, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[11],[12],[13] 0.03%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[11],[12],[13] $ 1,602,000  
Investment, Identifier [Axis]: 123Dentist, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[11],[12],[13],[14] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[11],[12],[13],[14] $ 133,000  
Investment, Identifier [Axis]: 123Dentist, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 104,000 191,000
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: ACI Group Holdings, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 1.97% [1],[2],[10],[13] 2.03% [3],[4],[5],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 123,643,000  
Ending balance $ 123,713,000 [1],[2],[10],[13] $ 123,643,000 [3],[4],[5],[9]
Investment, Identifier [Axis]: ACI Group Holdings, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.03% [1],[2],[10],[12],[13],[14] 0.01% [3],[4],[5],[6],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 694,000  
Ending balance 1,909,000 [1],[2],[10],[12],[13],[14] $ 694,000 [3],[4],[5],[6],[8],[9]
Investment, Identifier [Axis]: ACI Group Holdings, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 9,022,000 10,410,000
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: ADCS Clinics Intermediate Holdings, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.11% [1],[2],[13],[15] 0.11% [3],[4],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[16] $ 6,779,000  
Ending balance $ 6,743,000 [1],[2],[13],[15] $ 6,779,000 [3],[4],[9],[16]
Investment, Identifier [Axis]: ADCS Clinics Intermediate Holdings, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.03% [1],[2],[12],[13],[15] 0.03% [3],[4],[8],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[8],[9],[16] $ 1,625,000  
Ending balance $ 1,616,000 [1],[2],[12],[13],[15] $ 1,625,000 [3],[4],[8],[9],[16]
Investment, Identifier [Axis]: ADCS Clinics Intermediate Holdings, LLC 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [1],[2],[12],[13],[14],[15] 0.00% [3],[4],[6],[8],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[8],[9],[16] $ 111,000  
Ending balance 111,000 [1],[2],[12],[13],[14],[15] $ 111,000 [3],[4],[6],[8],[9],[16]
Investment, Identifier [Axis]: ADCS Clinics Intermediate Holdings, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,189,000 1,189,000
Fair Value 0 $ 0
Investment, Identifier [Axis]: AGI Group Holdings LP - Class A-2 Common Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[9]   0.02%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 1,239,000  
Ending balance [3],[4],[9]   $ 1,239,000
Investment, Identifier [Axis]: AGI Group Holdings, LP - Class A-2 Common Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[13] 0.02%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[13] $ 1,323,000  
Investment, Identifier [Axis]: AGI-CFI Holdings, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[9]   1.55%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 94,440,000  
Ending balance [3],[4],[5],[9]   $ 94,440,000
Investment, Identifier [Axis]: AGI-CFI Holdings, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13] 1.49%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13] $ 93,889,000  
Investment, Identifier [Axis]: AGI-CFI Holdings, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13] 0.10%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13] $ 6,118,000  
Investment, Identifier [Axis]: AI Altius Luxembourg S.à r.l.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.02% [1],[2],[12],[13],[17] 0.02% [6],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [6],[8],[9] $ 1,058,000  
Ending balance $ 1,116,000 [1],[2],[12],[13],[17] $ 1,058,000 [6],[8],[9]
Investment, Identifier [Axis]: AI Altius US Bidco, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.12% [1],[2],[10],[13],[14] 0.12% [3],[4],[5],[6],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[9] $ 7,531,000  
Ending balance 7,531,000 [1],[2],[10],[13],[14] $ 7,531,000 [3],[4],[5],[6],[9]
Investment, Identifier [Axis]: AI Altius US Bidco, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 500,000 500,000
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: AI Titan Group Holdings, LP - Class A-2 Common Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [1],[2],[13] 0.00% [3],[4],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 45,000  
Ending balance 52,000 [1],[2],[13] $ 45,000 [3],[4],[9]
Investment, Identifier [Axis]: AI Titan Parent Inc    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[8],[9]   0.07%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 4,332,000  
Ending balance [3],[4],[5],[6],[8],[9]   $ 4,332,000
Investment, Identifier [Axis]: AI Titan Parent Inc, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   870,000
Fair Value   (4,000)
Investment, Identifier [Axis]: AI Titan Parent Inc, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   544,000
Fair Value   $ (5,000)
Investment, Identifier [Axis]: AI Titan Parent, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.07%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 4,343,000  
Investment, Identifier [Axis]: AI Titan Parent, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 870,000  
Fair Value (4,000)  
Investment, Identifier [Axis]: AI Titan Parent, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 544,000  
Fair Value $ (5,000)  
Investment, Identifier [Axis]: ALKU, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.01% [1],[2],[10],[12],[13] 0.01% [3],[4],[5],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] $ 790,000  
Ending balance $ 780,000 [1],[2],[10],[12],[13] $ 790,000 [3],[4],[5],[8],[9]
Investment, Identifier [Axis]: ALKU, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.41% [1],[2],[10],[13] 0.43% [3],[4],[5],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 26,330,000  
Ending balance $ 25,802,000 [1],[2],[10],[13] $ 26,330,000 [3],[4],[5],[9]
Investment, Identifier [Axis]: AVE Holdings I Corp. - Series A-1 Preferred Shares    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.01% [1],[2],[13] 0.01% [3],[4],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 679,000  
Ending balance 721,000 [1],[2],[13] $ 679,000 [3],[4],[9]
Investment, Identifier [Axis]: Abacus Holdco 2 Oy    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[6],[7],[8],[9],[18]   0.01%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[7],[8],[9],[18] $ 748,000  
Ending balance [3],[4],[6],[7],[8],[9],[18]   $ 748,000
Investment, Identifier [Axis]: Abacus Holdco 2 Oy, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   298,000
Fair Value   $ 0
Investment, Identifier [Axis]: Abacus Holdco 2, Oy    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[14],[17] 0.02%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[14],[17] $ 979,000  
Investment, Identifier [Axis]: Abacus Holdco 2, Oy, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 177,000  
Fair Value $ 0  
Investment, Identifier [Axis]: Accuity Delivery Systems, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[12],[13],[14],[19] 0.50%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[12],[13],[14],[19] $ 31,699,000  
Investment, Identifier [Axis]: Accuity Delivery Systems, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 15,982,000  
Fair Value (80,000)  
Investment, Identifier [Axis]: Accuity Delivery Systems, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 5,327,000  
Fair Value (27,000)  
Investment, Identifier [Axis]: Acumatica Holdings, Inc, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,916,000  
Fair Value 0  
Investment, Identifier [Axis]: Acumatica Holdings, Inc, Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 11,497,000  
Fair Value $ 0  
Investment, Identifier [Axis]: Aevex Holdings, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.74% [1],[2],[13],[15] 0.78% [3],[4],[8],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[8],[9],[16] $ 47,309,000  
Ending balance $ 46,835,000 [1],[2],[13],[15] $ 47,309,000 [3],[4],[8],[9],[16]
Investment, Identifier [Axis]: Albireo Energy, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 1.19% [1],[2],[12],[13],[15] 1.22% [3],[4],[8],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[8],[9],[16] $ 73,860,000  
Ending balance $ 74,630,000 [1],[2],[12],[13],[15] $ 73,860,000 [3],[4],[8],[9],[16]
Investment, Identifier [Axis]: Albireo Energy, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.36% [1],[2],[12],[13],[15] 0.36% [3],[4],[8],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[8],[9],[16] $ 22,169,000  
Ending balance $ 22,400,000 [1],[2],[12],[13],[15] $ 22,169,000 [3],[4],[8],[9],[16]
Investment, Identifier [Axis]: Albireo Energy, LLC 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.10% [1],[2],[12],[13],[15] 0.10% [3],[4],[8],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[8],[9],[16] $ 5,981,000  
Ending balance 6,043,000 [1],[2],[12],[13],[15] $ 5,981,000 [3],[4],[8],[9],[16]
Investment, Identifier [Axis]: Alera Group, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[9]   0.06%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] 3,628,000  
Ending balance [3],[4],[5],[9]   $ 3,628,000
Investment, Identifier [Axis]: Alera Group, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[6],[9],[12],[16]   0.02%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[9],[12],[16] $ 1,218,000  
Ending balance [3],[4],[6],[9],[12],[16]   $ 1,218,000
Investment, Identifier [Axis]: Alera Group, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   69,000
Fair Value   $ 0
Investment, Identifier [Axis]: Allium Buyer, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.02% [1],[2],[12],[13],[14],[15] 0.03% [3],[4],[6],[8],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[8],[9],[16] $ 1,573,000  
Ending balance 1,565,000 [1],[2],[12],[13],[14],[15] $ 1,573,000 [3],[4],[6],[8],[9],[16]
Investment, Identifier [Axis]: Allium Buyer, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 249,000 249,000
Fair Value $ (7,000) $ (7,000)
Investment, Identifier [Axis]: American Restoration Holdings, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.07% [1],[2],[12],[13],[15] 0.08% [3],[4],[8],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[8],[9],[16] $ 4,625,000  
Ending balance $ 4,602,000 [1],[2],[12],[13],[15] $ 4,625,000 [3],[4],[8],[9],[16]
Investment, Identifier [Axis]: American Restoration Holdings, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.02% [1],[2],[12],[13],[15] 0.02% [3],[4],[6],[8],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[8],[9],[16] $ 1,377,000  
Ending balance $ 1,370,000 [1],[2],[12],[13],[15] $ 1,377,000 [3],[4],[6],[8],[9],[16]
Investment, Identifier [Axis]: American Restoration Holdings, LLC 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.01% [1],[2],[12],[13],[14],[15] 0.00% [3],[4],[6],[8],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[8],[9],[16] $ 286,000  
Ending balance $ 762,000 [1],[2],[12],[13],[14],[15] $ 286,000 [3],[4],[6],[8],[9],[16]
Investment, Identifier [Axis]: American Restoration Holdings, LLC 4    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.06% [1],[2],[12],[13],[15] 0.04% [3],[4],[6],[8],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[8],[9],[16] $ 2,451,000  
Ending balance $ 3,550,000 [1],[2],[12],[13],[15] $ 2,451,000 [3],[4],[6],[8],[9],[16]
Investment, Identifier [Axis]: American Restoration Holdings, LLC 5    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[12],[13],[14],[15] 0.04%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[12],[13],[14],[15] $ 2,645,000  
Investment, Identifier [Axis]: American Restoration Holdings, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 5,635,000 1,105,000
Fair Value 0 0
Investment, Identifier [Axis]: American Restoration Holdings, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 547,000 1,024,000
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Amerilife Holdings, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 1.54% [1],[2],[10],[13],[14] 0.04% [3],[4],[5],[9],[12]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9],[12] $ 2,654,000  
Ending balance $ 96,867,000 [1],[2],[10],[13],[14] $ 2,654,000 [3],[4],[5],[9],[12]
Investment, Identifier [Axis]: Amerilife Holdings, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [12] 0.03% [1],[2],[10],[13],[14] 0.01% [3],[4],[6],[9],[20]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[9],[12],[20] $ 357,000  
Ending balance [12] 1,889,000 [1],[2],[10],[13],[14] $ 357,000 [3],[4],[6],[9],[20]
Investment, Identifier [Axis]: Amerilife Holdings, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   340,000
Fair Value   0
Investment, Identifier [Axis]: Amerilife Holdings, LLC, Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments 104,000  
Fair Value 0  
Investment, Identifier [Axis]: Amerilife Holdings, LLC, Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments 31,555,000  
Fair Value 0  
Investment, Identifier [Axis]: Amerilife Holdings, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 14,685,000 243,000
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Amerivet Partners Management, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.09% [1],[2],[13],[14],[15] 0.09% [3],[4],[6],[8],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[8],[9],[16] $ 5,543,000  
Ending balance 5,443,000 [1],[2],[13],[14],[15] $ 5,543,000 [3],[4],[6],[8],[9],[16]
Investment, Identifier [Axis]: Amerivet Partners Management, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 589,000 589,000
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Anaplan, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.33% [1],[2],[10],[13] 0.03% [3],[4],[5],[6],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 1,804,000  
Ending balance $ 20,925,000 [1],[2],[10],[13] $ 1,804,000 [3],[4],[5],[6],[8],[9]
Investment, Identifier [Axis]: Anaplan, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.05% [1],[2],[10],[12],[13],[14] 0.32% [3],[4],[5],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 19,227,000  
Ending balance 3,438,000 [1],[2],[10],[12],[13],[14] $ 19,227,000 [3],[4],[5],[9]
Investment, Identifier [Axis]: Anaplan, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 161,000 161,000
Fair Value $ (3,000) $ 0
Investment, Identifier [Axis]: Apex Companies, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.17% [1],[2],[12],[13],[15] 0.18% [3],[4],[8],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[8],[9],[16] $ 10,869,000  
Ending balance $ 10,896,000 [1],[2],[12],[13],[15] $ 10,869,000 [3],[4],[8],[9],[16]
Investment, Identifier [Axis]: Apex Companies, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.03% [1],[2],[12],[13],[15] 0.03% [3],[4],[8],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[8],[9],[16] $ 1,957,000  
Ending balance $ 1,966,000 [1],[2],[12],[13],[15] $ 1,957,000 [3],[4],[8],[9],[16]
Investment, Identifier [Axis]: Apex Companies, LLC 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.04% [1],[2],[12],[13],[14],[15] 0.04% [3],[4],[6],[8],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[8],[9],[16] $ 2,731,000  
Ending balance 2,779,000 [1],[2],[12],[13],[14],[15] $ 2,731,000 [3],[4],[6],[8],[9],[16]
Investment, Identifier [Axis]: Apex Companies, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 5,507,000 5,507,000
Fair Value 0 $ 0
Investment, Identifier [Axis]: Armada Parent, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[9]   0.42%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[9] $ 25,479,000  
Ending balance [3],[4],[5],[6],[9]   $ 25,479,000
Investment, Identifier [Axis]: Armada Parent, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 744,000  
Investment, Identifier [Axis]: Armada Parent, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13] 0.40%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13] $ 25,350,000  
Investment, Identifier [Axis]: Armada Parent, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 1,250,000  
Fair Value 0  
Investment, Identifier [Axis]: Armada Parent, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 2,250,000 3,000,000
Fair Value 0 $ 0
Investment, Identifier [Axis]: Arnhem BidCo GmbH    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[6],[7],[9],[18]   0.82%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[7],[9],[18] $ 50,061,000  
Ending balance [3],[4],[6],[7],[9],[18]   $ 50,061,000
Investment, Identifier [Axis]: Arnhem BidCo GmbH, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   12,293,000
Fair Value   (58,000)
Investment, Identifier [Axis]: Arnhem BidCo, GmbH    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[13],[14],[17] 0.91%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[13],[14],[17] $ 57,505,000  
Investment, Identifier [Axis]: Arnhem BidCo, GmbH, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 12,332,000  
Fair Value $ (65,000)  
Investment, Identifier [Axis]: Artisan Acquisitionco Ltd, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   7,938,000
Fair Value   $ 0
Investment, Identifier [Axis]: Artisan Acquisitionco, Ltd.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.89% [1],[2],[11],[13],[14],[17] 0.92% [3],[4],[6],[7],[9],[18]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[7],[9],[18] $ 56,154,000  
Ending balance 56,075,000 [1],[2],[11],[13],[14],[17] $ 56,154,000 [3],[4],[6],[7],[9],[18]
Investment, Identifier [Axis]: Artisan Acquisitionco, Ltd., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 7,938,000  
Fair Value $ (79,000)  
Investment, Identifier [Axis]: Ascend Buyer, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.32% [1],[2],[10],[13],[14] 0.34% [3],[4],[5],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 20,460,000  
Ending balance $ 20,354,000 [1],[2],[10],[13],[14] $ 20,460,000 [3],[4],[5],[9]
Investment, Identifier [Axis]: Ascend Buyer, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.03% [1],[2],[10],[12],[13] 0.01% [3],[4],[5],[6],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 647,000  
Ending balance 1,607,000 [1],[2],[10],[12],[13] $ 647,000 [3],[4],[5],[6],[8],[9]
Investment, Identifier [Axis]: Ascend Buyer, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 2,991,000 1,293,000
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Auctane, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13] 4.35%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13] $ 273,427,000  
Investment, Identifier [Axis]: Auctane, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13] 0.05%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13] $ 3,216,000  
Investment, Identifier [Axis]: AuditBoard Inc    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[9]   0.15%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[9] $ 9,138,000  
Ending balance [3],[4],[5],[6],[9]   $ 9,138,000
Investment, Identifier [Axis]: AuditBoard Inc, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   4,414,000
Fair Value   (22,000)
Investment, Identifier [Axis]: AuditBoard Inc, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   1,766,000
Fair Value   $ (18,000)
Investment, Identifier [Axis]: AuditBoard, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13],[14] 0.15%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13],[14] $ 9,220,000  
Investment, Identifier [Axis]: AuditBoard, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 4,414,000  
Fair Value (22,000)  
Investment, Identifier [Axis]: AuditBoard, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,766,000  
Fair Value $ (4,000)  
Investment, Identifier [Axis]: Axsome Therapeutics, Inc. - Common Stock    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11] 0.02%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11] $ 1,430,000  
Investment, Identifier [Axis]: Axsome Therapeutics, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[17] 0.18%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[17] $ 11,622,000  
Investment, Identifier [Axis]: Axsome Therapeutics, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[17] 0.11%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[17] $ 6,814,000  
Investment, Identifier [Axis]: Axsome Therapeutics, Inc., Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments 8,805,000  
Fair Value 0  
Investment, Identifier [Axis]: Axsome Therapeutics, Inc., Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments 8,805,000  
Fair Value 0  
Investment, Identifier [Axis]: Azurite Intermediate Holdings Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[9]   0.61%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[9] $ 36,936,000  
Ending balance [3],[4],[5],[6],[9]   $ 36,936,000
Investment, Identifier [Axis]: Azurite Intermediate Holdings Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   4,104,000
Fair Value   $ 0
Investment, Identifier [Axis]: Azurite Intermediate Holdings, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13],[14] 0.59%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13],[14] $ 36,936,000  
Investment, Identifier [Axis]: Azurite Intermediate Holdings, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 4,104,000  
Fair Value $ 0  
Investment, Identifier [Axis]: BP Purchaser, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.10% [1],[2],[10],[13] 0.10% [3],[4],[5],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 6,338,000  
Ending balance 6,400,000 [1],[2],[10],[13] $ 6,338,000 [3],[4],[5],[9]
Investment, Identifier [Axis]: BPPH2 Limited 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[7],[8],[9],[18]   0.54%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[8],[9],[18] 32,925,000  
Ending balance [3],[4],[7],[8],[9],[18]   $ 32,925,000
Investment, Identifier [Axis]: BPPH2 Limited 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[7],[8],[9],[18]   0.11%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[8],[9],[18] 6,689,000  
Ending balance [3],[4],[7],[8],[9],[18]   $ 6,689,000
Investment, Identifier [Axis]: BPPH2 Limited 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[7],[8],[9]   0.04%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[7],[8],[9] 2,288,000  
Ending balance [3],[4],[5],[7],[8],[9]   $ 2,288,000
Investment, Identifier [Axis]: BPPH2 Limited 4    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[7],[8],[9]   0.03%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[7],[8],[9] 1,709,000  
Ending balance [3],[4],[5],[7],[8],[9]   $ 1,709,000
Investment, Identifier [Axis]: Baker Tilly Advisory Group LP    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[9]   0.77%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[9] $ 46,559,000  
Ending balance [3],[4],[5],[6],[9]   $ 46,559,000
Investment, Identifier [Axis]: Baker Tilly Advisory Group LP, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   7,034,000
Fair Value   (53,000)
Investment, Identifier [Axis]: Baker Tilly Advisory Group LP, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   9,856,000
Fair Value   $ 0
Investment, Identifier [Axis]: Baker Tilly Advisory Group, LP 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13] 0.85%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13] $ 53,404,000  
Investment, Identifier [Axis]: Baker Tilly Advisory Group, LP 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.05%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 3,390,000  
Investment, Identifier [Axis]: Baker Tilly Advisory Group, LP, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 1,484,000  
Fair Value 0  
Investment, Identifier [Axis]: Baker Tilly Advisory Group, LP, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 10,339,000  
Fair Value $ 0  
Investment, Identifier [Axis]: Bamboo US BidCo, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.01% [1],[2],[12],[13] 0.01% [3],[4],[6],[8],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[8],[9],[16] $ 759,000  
Ending balance $ 707,000 [1],[2],[12],[13] $ 759,000 [3],[4],[6],[8],[9],[16]
Investment, Identifier [Axis]: Bamboo US BidCo, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.01% [1],[2],[12],[13],[15] 0.01% [3],[4],[8],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[8],[9],[16] $ 367,000  
Ending balance $ 415,000 [1],[2],[12],[13],[15] $ 367,000 [3],[4],[8],[9],[16]
Investment, Identifier [Axis]: Bamboo US BidCo, LLC 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[12],[13],[15] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[12],[13],[15] $ 106,000  
Investment, Identifier [Axis]: Bamboo US BidCo, LLC, Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments 146,000 43,000
Fair Value 0 0
Investment, Identifier [Axis]: Bamboo US BidCo, LLC, Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments 132,000 146,000
Fair Value 0 0
Investment, Identifier [Axis]: Bamboo US BidCo, LLC, Delayed Draw Term Loan 3    
Schedule of Investments [Line Items]    
Unfunded commitments   146,000
Fair Value   (1,000)
Investment, Identifier [Axis]: Bamboo US BidCo, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 142,000 142,000
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Banyan Software Holdings, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[12],[13],[15] 0.15%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[12],[13],[15] $ 9,321,000  
Investment, Identifier [Axis]: Banyan Software Holdings, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[12],[13],[14],[15] 0.05%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[12],[13],[14],[15] $ 3,148,000  
Investment, Identifier [Axis]: Banyan Software Holdings, LLC, Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments 1,986,000  
Fair Value 0  
Investment, Identifier [Axis]: Banyan Software Holdings, LLC, Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments 1,771,000  
Fair Value (9,000)  
Investment, Identifier [Axis]: Banyan Software Holdings, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 859,000  
Fair Value $ 0  
Investment, Identifier [Axis]: Barbri Holdings, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13] 1.28%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13] $ 80,581,000  
Investment, Identifier [Axis]: Barbri Holdings, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[9]   1.01%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] 61,249,000  
Ending balance [3],[4],[5],[9]   $ 61,249,000
Investment, Identifier [Axis]: Barbri Holdings, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[9]   0.32%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] 19,381,000  
Ending balance [3],[4],[5],[9]   $ 19,381,000
Investment, Identifier [Axis]: Bayshore Intermediate #2 LP    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[8],[9]   1.55%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 94,115,000  
Ending balance [3],[4],[5],[6],[8],[9]   $ 94,115,000
Investment, Identifier [Axis]: Bayshore Intermediate #2 LP, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   4,217,000
Fair Value   (42,000)
Investment, Identifier [Axis]: Bayshore Intermediate #2 LP, Revolver 2    
Schedule of Investments [Line Items]    
Unfunded commitments   5,006,000
Fair Value   $ 0
Investment, Identifier [Axis]: Bayshore Intermediate #2, LP    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13],[14] 1.54%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13],[14] $ 96,857,000  
Investment, Identifier [Axis]: Bayshore Intermediate #2, LP, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 8,116,000  
Fair Value $ 0  
Investment, Identifier [Axis]: Bazaarvoice, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 3.79% [1],[2],[13],[14],[17] 4.07% [3],[4],[6],[9],[18]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[9],[18] $ 247,360,000  
Ending balance 238,337,000 [1],[2],[13],[14],[17] $ 247,360,000 [3],[4],[6],[9],[18]
Investment, Identifier [Axis]: Bazaarvoice, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 37,992,000 20,255,000
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Bending Spoons US, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[15] 0.23%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[15] $ 14,272,000  
Investment, Identifier [Axis]: Bidco 76 S.p.A.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.34% [1],[2],[11],[13],[14],[17] 0.33% [3],[4],[6],[7],[9],[18]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[7],[9],[18] $ 20,325,000  
Ending balance 21,566,000 [1],[2],[11],[13],[14],[17] $ 20,325,000 [3],[4],[6],[7],[9],[18]
Investment, Identifier [Axis]: Bidco 76 S.p.A., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 3,849,000 4,199,000
Fair Value 0 $ 0
Investment, Identifier [Axis]: Bimini Group Purchaser Inc 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[9]   0.84%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] 50,912,000  
Ending balance [3],[4],[5],[9]   $ 50,912,000
Investment, Identifier [Axis]: Bimini Group Purchaser Inc 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[8],[9]   0.03%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 2,008,000  
Ending balance [3],[4],[5],[6],[8],[9]   $ 2,008,000
Investment, Identifier [Axis]: Bimini Group Purchaser Inc, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   18,925,000
Fair Value   (95,000)
Investment, Identifier [Axis]: Bimini Group Purchaser Inc, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   2,804,000
Fair Value   $ 0
Investment, Identifier [Axis]: Bimini Group Purchaser, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13] 1.11%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13] $ 69,534,000  
Investment, Identifier [Axis]: Bimini Group Purchaser, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.07%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 4,391,000  
Investment, Identifier [Axis]: Bimini Group Purchaser, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 8,580,000  
Fair Value (43,000)  
Investment, Identifier [Axis]: Bimini Group Purchaser, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 7,337,000  
Fair Value $ 0  
Investment, Identifier [Axis]: BlackRock ICS US Treasury Fund    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.01% [1],[2] 0.00% [3],[4]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4] $ 260,000  
Ending balance $ 360,000 [1],[2] $ 260,000 [3],[4]
Investment, Identifier [Axis]: Blackstone Donegal Holdings LP - LP Interest (Westland Insurance Group LTD)    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.11% [1],[2],[11],[13],[21] 0.11% [3],[4],[7],[9],[22]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[9],[22] $ 6,403,000  
Ending balance $ 6,737,000 [1],[2],[11],[13],[21] $ 6,403,000 [3],[4],[7],[9],[22]
Investment, Identifier [Axis]: BlueCat Networks USA, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.03% [1],[2],[10],[13] 0.03% [3],[4],[5],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] $ 1,950,000  
Ending balance $ 1,930,000 [1],[2],[10],[13] $ 1,950,000 [3],[4],[5],[8],[9]
Investment, Identifier [Axis]: BlueCat Networks USA, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.01% [1],[2],[10],[12],[13] 0.01% [3],[4],[5],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] $ 344,000  
Ending balance $ 341,000 [1],[2],[10],[12],[13] $ 344,000 [3],[4],[5],[8],[9]
Investment, Identifier [Axis]: BlueCat Networks USA, Inc. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [1],[2],[10],[12],[13] 0.00% [3],[4],[5],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] $ 237,000  
Ending balance $ 234,000 [1],[2],[10],[12],[13] $ 237,000 [3],[4],[5],[8],[9]
Investment, Identifier [Axis]: BlueCat Networks USA, Inc. 4    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.02% [1],[2],[10],[12],[13] 0.03% [3],[4],[5],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] $ 1,583,000  
Ending balance $ 1,567,000 [1],[2],[10],[12],[13] $ 1,583,000 [3],[4],[5],[8],[9]
Investment, Identifier [Axis]: Bluefin Holding, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.43% [1],[2],[13],[14],[15] 0.45% [3],[4],[6],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[9],[16] $ 27,217,000  
Ending balance 27,291,000 [1],[2],[13],[14],[15] $ 27,217,000 [3],[4],[6],[9],[16]
Investment, Identifier [Axis]: Bluefin Holding, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 2,244,000 2,244,000
Fair Value 0 $ (6,000)
Investment, Identifier [Axis]: Box Co-Invest Blocker, LLC - (BP Alpha Holdings, L.P.) - Class A Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[9]   0.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] 0  
Ending balance [3],[4],[9]   $ 0
Investment, Identifier [Axis]: Box Co-Invest Blocker, LLC - (BP Alpha Holdings, L.P.) - Class C Preferred Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[9]   0.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 16,000  
Ending balance [3],[4],[9]   $ 16,000
Investment, Identifier [Axis]: Box Co-Invest Blocker, LLC - (BP Alpha Holdings, LP) - Class A Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[13] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[13] $ 0  
Investment, Identifier [Axis]: Box Co-Invest Blocker, LLC - (BP Alpha Holdings, LP) - Class C Preferred Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[13] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[13] $ 0  
Investment, Identifier [Axis]: Bradyplus Holdings LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4]   1.61%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4] 97,868,000  
Ending balance [3],[4]   $ 97,868,000
Investment, Identifier [Axis]: Bradyplus Holdings LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[6],[9],[16]   0.01%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[9],[16] $ 619,000  
Ending balance [3],[4],[6],[9],[16]   $ 619,000
Investment, Identifier [Axis]: Bradyplus Holdings LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   2,260,000
Fair Value   $ 0
Investment, Identifier [Axis]: Bradyplus Holdings, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[13],[15] 1.55%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[13],[15] $ 97,331,000  
Investment, Identifier [Axis]: Bradyplus Holdings, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[12],[13],[14],[15] 0.02%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[12],[13],[14],[15] $ 945,000  
Investment, Identifier [Axis]: Bradyplus Holdings, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 1,930,000  
Fair Value $ 0  
Investment, Identifier [Axis]: Brave Parent Holdings, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 1.07% [1],[2],[10],[13],[14] 1.12% [3],[4],[5],[6],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[9] $ 67,765,000  
Ending balance 67,447,000 [1],[2],[10],[13],[14] $ 67,765,000 [3],[4],[5],[6],[9]
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   3,058,000
Fair Value   0
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 3,641,000 3,641,000
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Brilliance Technologies, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[12],[13],[14],[19] 0.02%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[12],[13],[14],[19] $ 1,487,000  
Investment, Identifier [Axis]: Brilliance Technologies, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[12],[13],[19] 0.04%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[12],[13],[19] $ 2,388,000  
Investment, Identifier [Axis]: Brilliance Technologies, Inc. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[12],[13],[19] 0.03%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[12],[13],[19] $ 2,119,000  
Investment, Identifier [Axis]: Brilliance Technologies, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 1,200,000  
Fair Value 0  
Investment, Identifier [Axis]: Brilliance Technologies, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 900,000  
Fair Value (5,000)  
Investment, Identifier [Axis]: CB Nike Holdco LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[8],[9],[16]   0.61%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[8],[9],[16] 36,964,000  
Ending balance [3],[4],[8],[9],[16]   $ 36,964,000
Investment, Identifier [Axis]: CB Nike Holdco LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[6],[8],[9],[16]   0.19%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[8],[9],[16] $ 11,258,000  
Ending balance [3],[4],[6],[8],[9],[16]   $ 11,258,000
Investment, Identifier [Axis]: CB Nike Holdco LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   11,606,000
Fair Value   (87,000)
Investment, Identifier [Axis]: CB Nike Holdco LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   5,803,000
Fair Value   $ (87,000)
Investment, Identifier [Axis]: CB Nike Holdco, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[13],[15] 0.59%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[13],[15] $ 37,002,000  
Investment, Identifier [Axis]: CCBlue Bidco, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.16% [1],[2],[10],[12],[13] 0.17% [3],[4],[5],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] $ 10,382,000  
Ending balance $ 10,200,000 [1],[2],[10],[12],[13] $ 10,382,000 [3],[4],[5],[8],[9]
Investment, Identifier [Axis]: CCI Buyer, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.35%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 21,846,000  
Investment, Identifier [Axis]: CCI Buyer, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,289,000  
Fair Value $ (13,000)  
Investment, Identifier [Axis]: CFCo, LLC (Benefytt Technologies, Inc.)    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [12] 0.00% [1],[2],[13],[17],[23],[24] 0.00% [3],[4],[8],[9],[18],[25],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[8],[9],[12],[18],[25],[26] $ 0  
Ending balance [12] $ 0 [1],[2],[13],[17],[23],[24] $ 0 [3],[4],[8],[9],[18],[25],[26]
Investment, Identifier [Axis]: CFCo, LLC (Benefytt Technologies, Inc.) - Class B Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [1],[2],[13] 0.00% [3],[4],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 0  
Ending balance $ 0 [1],[2],[13] $ 0 [3],[4],[9]
Investment, Identifier [Axis]: CFGI Holdings, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.11% [1],[2],[10],[13],[14] 0.11% [3],[4],[5],[6],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[9] $ 6,866,000  
Ending balance 6,827,000 [1],[2],[10],[13],[14] $ 6,866,000 [3],[4],[5],[6],[9]
Investment, Identifier [Axis]: CFGI Holdings, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,050,000 1,050,000
Fair Value $ (21,000) $ (21,000)
Investment, Identifier [Axis]: CFS Brands, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 2.05% [1],[2],[13],[14],[15] 2.02% [3],[4],[6],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[9],[16] $ 123,041,000  
Ending balance 129,003,000 [1],[2],[13],[14],[15] $ 123,041,000 [3],[4],[6],[9],[16]
Investment, Identifier [Axis]: CFS Brands, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   6,241,000
Fair Value   (62,000)
Investment, Identifier [Axis]: CFS Brands, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 18,177,000 18,177,000
Fair Value 0 $ (364,000)
Investment, Identifier [Axis]: COP Home Services TopCo IV, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[6],[9],[16]   0.61%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[9],[16] 37,292,000  
Ending balance [3],[4],[6],[9],[16]   $ 37,292,000
Investment, Identifier [Axis]: COP Home Services TopCo IV, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   3,509,000
Fair Value   $ (38,000)
Investment, Identifier [Axis]: CPI Buyer, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[9]   0.45%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] 27,292,000  
Ending balance [3],[4],[5],[9]   $ 27,292,000
Investment, Identifier [Axis]: CPI Buyer, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[8],[9]   0.05%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] 2,913,000  
Ending balance [3],[4],[5],[8],[9]   $ 2,913,000
Investment, Identifier [Axis]: CPI Buyer, LLC 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[8],[9]   0.02%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] 1,505,000  
Ending balance [3],[4],[5],[6],[8],[9]   $ 1,505,000
Investment, Identifier [Axis]: CPI Buyer, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   985,000
Fair Value   0
Investment, Identifier [Axis]: CPI Buyer, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   3,214,000
Fair Value   $ (64,000)
Investment, Identifier [Axis]: CRCI Longhorn Holdings Inc 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[8],[9]   0.19%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] 11,412,000  
Ending balance [3],[4],[5],[8],[9]   $ 11,412,000
Investment, Identifier [Axis]: CRCI Longhorn Holdings Inc 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[9]   0.01%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[9] $ 836,000  
Ending balance [3],[4],[5],[6],[9]   $ 836,000
Investment, Identifier [Axis]: CRCI Longhorn Holdings Inc, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   2,867,000
Fair Value   (14,000)
Investment, Identifier [Axis]: CRCI Longhorn Holdings Inc, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   1,051,000
Fair Value   $ 0
Investment, Identifier [Axis]: CRCI Longhorn Holdings, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.18%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 11,398,000  
Investment, Identifier [Axis]: CRCI Longhorn Holdings, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 2,867,000  
Fair Value (14,000)  
Investment, Identifier [Axis]: CRCI Longhorn Holdings, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,912,000  
Fair Value $ 0  
Investment, Identifier [Axis]: CT Technologies Intermediate Holdings, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.45% [1],[2],[10],[13],[14] 0.47% [3],[4],[5],[6],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[9] $ 28,322,000  
Ending balance 28,180,000 [1],[2],[10],[13],[14] $ 28,322,000 [3],[4],[5],[6],[9]
Investment, Identifier [Axis]: CT Technologies Intermediate Holdings, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 973,000 973,000
Fair Value 0 0
Investment, Identifier [Axis]: CT Technologies Intermediate Holdings, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 2,433,000 2,433,000
Fair Value $ 0 $ (24,000)
Investment, Identifier [Axis]: Caerus Midco 2 S.à r.l. - Additional Vehicle Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [1],[2],[11],[13] 0.00% [3],[4],[7],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[9] $ 1,000  
Ending balance $ 1,000 [1],[2],[11],[13] $ 1,000 [3],[4],[7],[9]
Investment, Identifier [Axis]: Caerus Midco 2 S.à r.l. - Vehicle Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [1],[2],[11],[13] 0.00% [3],[4],[7],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[9] $ 54,000  
Ending balance $ 54,000 [1],[2],[11],[13] $ 54,000 [3],[4],[7],[9]
Investment, Identifier [Axis]: Caerus US 1, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.18% [1],[2],[10],[11],[12],[13] 0.19% [3],[4],[5],[7],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[7],[8],[9] $ 11,284,000  
Ending balance $ 11,227,000 [1],[2],[10],[11],[12],[13] $ 11,284,000 [3],[4],[5],[7],[8],[9]
Investment, Identifier [Axis]: Caerus US 1, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.03% [1],[2],[10],[11],[12],[13] 0.04% [3],[4],[5],[7],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[7],[8],[9] $ 2,176,000  
Ending balance $ 2,165,000 [1],[2],[10],[11],[12],[13] $ 2,176,000 [3],[4],[5],[7],[8],[9]
Investment, Identifier [Axis]: Caerus US 1, Inc. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.01% [1],[2],[10],[11],[12],[13] 0.01% [3],[4],[5],[7],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[7],[8],[9] $ 318,000  
Ending balance $ 317,000 [1],[2],[10],[11],[12],[13] $ 318,000 [3],[4],[5],[7],[8],[9]
Investment, Identifier [Axis]: Caerus US 1, Inc. 4    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.79% [1],[2],[10],[11],[13] 0.82% [3],[4],[7],[9],[18]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[9],[18] $ 49,714,000  
Ending balance $ 49,500,000 [1],[2],[10],[11],[13] $ 49,714,000 [3],[4],[7],[9],[18]
Investment, Identifier [Axis]: Caerus US 1, Inc. 5    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [1],[2],[10],[11],[12],[13],[14] 0.00% [3],[4],[6],[7],[8],[9],[27]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[7],[8],[9],[27] $ 97,000  
Ending balance 249,000 [1],[2],[10],[11],[12],[13],[14] $ 97,000 [3],[4],[6],[7],[8],[9],[27]
Investment, Identifier [Axis]: Caerus US 1, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,038,000 1,190,000
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Cambium Holdings, LLC - Senior Preferred Interest    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.29% [1],[2],[13] 0.29% [3],[4],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 17,874,000  
Ending balance $ 18,228,000 [1],[2],[13] $ 17,874,000 [3],[4],[9]
Investment, Identifier [Axis]: Cambium Learning Group, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 4.53% [1],[2],[10],[13],[14] 4.71% [3],[4],[5],[6],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[9] $ 286,185,000  
Ending balance 284,706,000 [1],[2],[10],[13],[14] $ 286,185,000 [3],[4],[5],[6],[9]
Investment, Identifier [Axis]: Cambium Learning Group, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 43,592,000 43,592,000
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Cambrex Corp.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.35%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 22,105,000  
Investment, Identifier [Axis]: Cambrex Corp., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 3,323,000  
Fair Value (17,000)  
Investment, Identifier [Axis]: Cambrex Corp., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 2,907,000  
Fair Value (29,000)  
Investment, Identifier [Axis]: Canadian Hospital Specialties Ltd.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[7],[8],[9],[18]   0.11%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[8],[9],[18] 6,723,000  
Ending balance [3],[4],[7],[8],[9],[18]   $ 6,723,000
Investment, Identifier [Axis]: Canadian Hospital Specialties Ltd. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[7],[8],[9],[16]   0.33%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[8],[9],[16] 20,100,000  
Ending balance [3],[4],[7],[8],[9],[16]   $ 20,100,000
Investment, Identifier [Axis]: Canadian Hospital Specialties Ltd. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[7],[8],[9]   0.02%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[7],[8],[9] $ 1,507,000  
Ending balance [3],[4],[5],[6],[7],[8],[9]   $ 1,507,000
Investment, Identifier [Axis]: Canadian Hospital Specialties Ltd., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   1,198,000
Fair Value   $ 0
Investment, Identifier [Axis]: Canadian Hospital Specialties, Ltd.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[17] 0.11%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[17] $ 7,155,000  
Investment, Identifier [Axis]: Canadian Hospital Specialties, Ltd. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[15] 0.34%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[15] $ 21,210,000  
Investment, Identifier [Axis]: Canadian Hospital Specialties, Ltd. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[11],[12],[13],[14] 0.03%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[11],[12],[13],[14] $ 1,604,000  
Investment, Identifier [Axis]: Canadian Hospital Specialties, Ltd., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,232,000  
Fair Value 0  
Investment, Identifier [Axis]: Capstone Acquisition Holdings Inc    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[9],[16]   0.09%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[16] $ 5,459,000  
Ending balance [3],[4],[9],[16]   $ 5,459,000
Investment, Identifier [Axis]: Capstone Acquisition Holdings, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[13],[15] 0.09%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[13],[15] $ 5,432,000  
Investment, Identifier [Axis]: Caribou Bidco Ltd    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[6],[7],[9],[18]   0.73%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[7],[9],[18] $ 44,135,000  
Ending balance [3],[4],[6],[7],[9],[18]   $ 44,135,000
Investment, Identifier [Axis]: Caribou Bidco Ltd, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   5,106,000
Fair Value   $ (25,000)
Investment, Identifier [Axis]: Caribou Bidco, Ltd.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[13],[17] 0.86%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[13],[17] $ 53,918,000  
Investment, Identifier [Axis]: Carr Riggs & Ingram Capital LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[8],[9],[28]   0.12%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[8],[9],[28] 7,369,000  
Ending balance [3],[4],[8],[9],[28]   $ 7,369,000
Investment, Identifier [Axis]: Carr Riggs & Ingram Capital LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[6],[8],[9],[28]   0.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[8],[9],[28] $ 180,000  
Ending balance [3],[4],[6],[8],[9],[28]   $ 180,000
Investment, Identifier [Axis]: Carr Riggs & Ingram Capital LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   3,776,000
Fair Value   (19,000)
Investment, Identifier [Axis]: Carr Riggs & Ingram Capital LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   1,510,000
Fair Value   $ 0
Investment, Identifier [Axis]: Carr Riggs & Ingram Capital, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[12],[13],[19] 0.12%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[12],[13],[19] $ 7,388,000  
Investment, Identifier [Axis]: Carr Riggs & Ingram Capital, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[12],[13],[14],[19] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[12],[13],[14],[19] $ 771,000  
Investment, Identifier [Axis]: Carr Riggs & Ingram Capital, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 2,975,000  
Fair Value 0  
Investment, Identifier [Axis]: Carr Riggs & Ingram Capital, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,726,000  
Fair Value $ (9,000)  
Investment, Identifier [Axis]: Cassipoee, SASU    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[17] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[17] $ 185,000  
Investment, Identifier [Axis]: Castle Management Borrower, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.38% [1],[2],[13],[14],[15] 0.38% [3],[4],[6],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[9],[16] $ 23,100,000  
Ending balance 23,858,000 [1],[2],[13],[14],[15] $ 23,100,000 [3],[4],[6],[9],[16]
Investment, Identifier [Axis]: Castle Management Borrower, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 2,042,000 2,917,000
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Channelside AcquisitionCo, Inc    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.31%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 19,604,000  
Investment, Identifier [Axis]: Channelside AcquisitionCo, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[8],[9]   0.32%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] 19,694,000  
Ending balance [3],[4],[5],[6],[8],[9]   $ 19,694,000
Investment, Identifier [Axis]: Channelside AcquisitionCo, Inc., Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments   1,980,000
Fair Value   (10,000)
Investment, Identifier [Axis]: Channelside AcquisitionCo, Inc., Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments   19,000
Fair Value   0
Investment, Identifier [Axis]: Channelside AcquisitionCo, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 3,178,000 3,178,000
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Charger Debt Merger Sub, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.19% [1],[2],[10],[12],[13] 0.20% [3],[4],[5],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] $ 11,927,000  
Ending balance $ 11,867,000 [1],[2],[10],[12],[13] $ 11,927,000 [3],[4],[5],[8],[9]
Investment, Identifier [Axis]: Charger Debt Merger Sub, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.06% [1],[2],[10],[12],[13],[14] 0.04% [3],[4],[5],[6],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 2,528,000  
Ending balance 4,062,000 [1],[2],[10],[12],[13],[14] $ 2,528,000 [3],[4],[5],[6],[8],[9]
Investment, Identifier [Axis]: Charger Debt Merger Sub, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   3,972,000
Fair Value   0
Investment, Identifier [Axis]: Charger Debt Merger Sub, LLC, Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments 2,404,000  
Fair Value 0  
Investment, Identifier [Axis]: Charger Debt Merger Sub, LLC, Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments 6,235,000  
Fair Value (16,000)  
Investment, Identifier [Axis]: Charger Debt Merger Sub, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,522,000 1,522,000
Fair Value $ (15,000) $ (15,000)
Investment, Identifier [Axis]: Chartwell Cumming Holding, Corp. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[13],[14],[15] 1.38%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[13],[14],[15] $ 86,698,000  
Investment, Identifier [Axis]: Chartwell Cumming Holding, Corp. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[12],[13],[14],[15] 0.16%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[12],[13],[14],[15] $ 9,828,000  
Investment, Identifier [Axis]: Chartwell Cumming Holding, Corp. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[13],[15] 0.22%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[13],[15] $ 14,003,000  
Investment, Identifier [Axis]: Chartwell Cumming Holding, Corp., Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments 1,629,000  
Fair Value 0  
Investment, Identifier [Axis]: Chartwell Cumming Holding, Corp., Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments 16,136,000  
Fair Value (81,000)  
Investment, Identifier [Axis]: Chartwell Cumming Holding, Corp., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 18,894,000  
Fair Value $ 0  
Investment, Identifier [Axis]: Cielo Bidco, Ltd. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[17] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[17] $ 206,000  
Investment, Identifier [Axis]: Cielo Bidco, Ltd. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[14],[17] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[14],[17] $ 63,000  
Investment, Identifier [Axis]: Cielo Bidco, Ltd. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[17] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[17] $ 75,000  
Investment, Identifier [Axis]: Cielo Bidco, Ltd. 4    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[14],[17] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[14],[17] $ 35,000  
Investment, Identifier [Axis]: Cielo Bidco, Ltd., Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments 35,000  
Fair Value 0  
Investment, Identifier [Axis]: Cielo Bidco, Ltd., Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments 107,000  
Fair Value 0  
Investment, Identifier [Axis]: Cisive Holdings Corp    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[9]   0.14%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[9] $ 8,252,000  
Ending balance [3],[4],[5],[6],[9]   $ 8,252,000
Investment, Identifier [Axis]: Cisive Holdings Corp, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   1,111,000
Fair Value   $ (22,000)
Investment, Identifier [Axis]: Cisive Holdings Corp.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[13],[14],[15] 0.13%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[13],[14],[15] $ 8,168,000  
Investment, Identifier [Axis]: Cisive Holdings Corp., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,111,000  
Fair Value $ 0  
Investment, Identifier [Axis]: Clearview Buyer, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.11% [1],[2],[10],[13],[14] 0.12% [3],[4],[5],[6],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 7,276,000  
Ending balance 7,229,000 [1],[2],[10],[13],[14] $ 7,276,000 [3],[4],[5],[6],[8],[9]
Investment, Identifier [Axis]: Clearview Buyer, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,142,000 898,000
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Color Intermediate, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.32% [1],[2],[10],[13] 0.33% [3],[4],[5],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 19,958,000  
Ending balance $ 19,858,000 [1],[2],[10],[13] $ 19,958,000 [3],[4],[5],[9]
Investment, Identifier [Axis]: Commander Buyer, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.50%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 31,345,000  
Investment, Identifier [Axis]: Commander Buyer, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 8,671,000  
Fair Value (43,000)  
Investment, Identifier [Axis]: Commander Buyer, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 5,781,000  
Fair Value (58,000)  
Investment, Identifier [Axis]: Community Management Holdings Midco 2 LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[8],[9]   0.17%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] 10,087,000  
Ending balance [3],[4],[5],[8],[9]   $ 10,087,000
Investment, Identifier [Axis]: Community Management Holdings Midco 2 LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[8],[9]   0.01%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 422,000  
Ending balance [3],[4],[5],[6],[8],[9]   $ 422,000
Investment, Identifier [Axis]: Community Management Holdings Midco 2 LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   4,096,000
Fair Value   (31,000)
Investment, Identifier [Axis]: Community Management Holdings Midco 2 LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   1,229,000
Fair Value   $ 0
Investment, Identifier [Axis]: Community Management Holdings Midco 2, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13] 0.15%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13] $ 9,626,000  
Investment, Identifier [Axis]: Community Management Holdings Midco 2, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.04%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 2,287,000  
Investment, Identifier [Axis]: Community Management Holdings Midco 2, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 1,994,000  
Fair Value 0  
Investment, Identifier [Axis]: Community Management Holdings Midco 2, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,158,000  
Fair Value $ 0  
Investment, Identifier [Axis]: Community Management Holdings Parent, LP - Series A Preferred Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.01% [1],[2],[13] 0.01% [3],[4],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 310,000  
Ending balance 329,000 [1],[2],[13] $ 310,000 [3],[4],[9]
Investment, Identifier [Axis]: Compsych Investments Corp    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[8],[9]   0.20%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 12,086,000  
Ending balance [3],[4],[5],[6],[8],[9]   $ 12,086,000
Investment, Identifier [Axis]: Compsych Investments Corp, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   3,471,000
Fair Value   $ (9,000)
Investment, Identifier [Axis]: Compsych Investments Corp.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13],[14] 0.19%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13],[14] $ 12,055,000  
Investment, Identifier [Axis]: Compsych Investments Corp., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 3,471,000  
Fair Value $ (9,000)  
Investment, Identifier [Axis]: Confine Visual Bidco 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.20% [1],[2],[11],[13],[17] 0.21% [3],[4],[7],[9],[18]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[9],[18] $ 12,813,000  
Ending balance $ 12,734,000 [1],[2],[11],[13],[17] $ 12,813,000 [3],[4],[7],[9],[18]
Investment, Identifier [Axis]: Confine Visual Bidco 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [1],[2],[11],[12],[13],[17] 0.01% [3],[4],[7],[8],[9],[18]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[8],[9],[18] $ 306,000  
Ending balance $ 304,000 [1],[2],[11],[12],[13],[17] $ 306,000 [3],[4],[7],[8],[9],[18]
Investment, Identifier [Axis]: Confluence Technologies, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[12],[13],[19] 0.03%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[12],[13],[19] $ 2,182,000  
Investment, Identifier [Axis]: Connatix Buyer, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.33% [1],[2],[10],[13] 0.34% [3],[4],[5],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 20,937,000  
Ending balance $ 20,928,000 [1],[2],[10],[13] $ 20,937,000 [3],[4],[5],[9]
Investment, Identifier [Axis]: Connatix Buyer, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.04% [1],[2],[10],[12],[13],[14] 0.02% [3],[4],[5],[6],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 1,332,000  
Ending balance $ 2,308,000 [1],[2],[10],[12],[13],[14] $ 1,332,000 [3],[4],[5],[6],[8],[9]
Investment, Identifier [Axis]: Connatix Buyer, Inc. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.02% [1],[2],[10],[12],[13],[14] 0.02% [3],[4],[5],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] $ 1,120,000  
Ending balance 1,273,000 [1],[2],[10],[12],[13],[14] $ 1,120,000 [3],[4],[5],[8],[9]
Investment, Identifier [Axis]: Connatix Buyer, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 848,000 1,015,000
Fair Value 0 0
Investment, Identifier [Axis]: Connatix Buyer, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 3,042,000 3,976,000
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Connatix Parent, LLC - Class L Common Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [1],[2],[13] 0.00% [3],[4],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 209,000  
Ending balance $ 209,000 [1],[2],[13] $ 209,000 [3],[4],[9]
Investment, Identifier [Axis]: Consor Intermediate II, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.10% [1],[2],[10],[12],[13],[14] 0.07% [3],[4],[5],[6],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 4,371,000  
Ending balance 5,992,000 [1],[2],[10],[12],[13],[14] $ 4,371,000 [3],[4],[5],[6],[8],[9]
Investment, Identifier [Axis]: Consor Intermediate II, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 3,218,000 4,002,000
Fair Value 0 (20,000)
Investment, Identifier [Axis]: Consor Intermediate II, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 213,000 1,067,000
Fair Value 0 $ 0
Investment, Identifier [Axis]: Continental Buyer Inc    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[8],[9]   0.30%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 18,360,000  
Ending balance [3],[4],[5],[6],[8],[9]   $ 18,360,000
Investment, Identifier [Axis]: Continental Buyer Inc, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   7,239,000
Fair Value   (54,000)
Investment, Identifier [Axis]: Continental Buyer Inc, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   2,715,000
Fair Value   $ 0
Investment, Identifier [Axis]: Continental Buyer, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.42%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 26,373,000  
Investment, Identifier [Axis]: Continental Buyer, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 10,729,000  
Fair Value 0  
Investment, Identifier [Axis]: Continental Buyer, Inc., Revolver 1    
Schedule of Investments [Line Items]    
Unfunded commitments 2,715,000  
Fair Value 0  
Investment, Identifier [Axis]: Continental Buyer, Inc., Revolver 2    
Schedule of Investments [Line Items]    
Unfunded commitments 4,350,000  
Fair Value (22,000)  
Investment, Identifier [Axis]: Corfin Holdings, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[9]   4.35%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 264,053,000  
Ending balance [3],[4],[5],[9]   $ 264,053,000
Investment, Identifier [Axis]: Corfin Holdings, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13] 4.16%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13] $ 261,327,000  
Investment, Identifier [Axis]: Corfin Holdings, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13] 0.02%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13] $ 1,564,000  
Investment, Identifier [Axis]: Corfin Holdings, Inc., Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   1,636,000
Fair Value   $ 0
Investment, Identifier [Axis]: Coupa Software Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[7],[8],[9]   0.03%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[7],[8],[9] $ 1,825,000  
Ending balance [3],[4],[5],[6],[7],[8],[9]   $ 1,825,000
Investment, Identifier [Axis]: Coupa Software Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   164,000
Fair Value   (2,000)
Investment, Identifier [Axis]: Coupa Software Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   126,000
Fair Value   $ 0
Investment, Identifier [Axis]: Coupa Software, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[11],[12],[13],[14] 0.03%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[11],[12],[13],[14] $ 1,816,000  
Investment, Identifier [Axis]: Coupa Software, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 164,000  
Fair Value (2,000)  
Investment, Identifier [Axis]: Coupa Software, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 126,000  
Fair Value 0  
Investment, Identifier [Axis]: Creek Parent Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[9]   1.11%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[9] $ 67,421,000  
Ending balance [3],[4],[5],[6],[9]   $ 67,421,000
Investment, Identifier [Axis]: Creek Parent Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   9,893,000
Fair Value   $ (173,000)
Investment, Identifier [Axis]: Creek Parent, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13],[14] 1.08%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13],[14] $ 67,939,000  
Investment, Identifier [Axis]: Creek Parent, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 9,893,000  
Fair Value $ (173,000)  
Investment, Identifier [Axis]: Crewline Buyer, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.98% [1],[2],[13],[14],[15] 1.01% [3],[4],[6],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[9],[16] $ 61,615,000  
Ending balance 61,615,000 [1],[2],[13],[14],[15] $ 61,615,000 [3],[4],[6],[9],[16]
Investment, Identifier [Axis]: Crewline Buyer, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 6,438,000 6,438,000
Fair Value $ (31,000) $ (31,000)
Investment, Identifier [Axis]: Cronos Crimson Holdings, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13] 1.13%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13] $ 71,173,000  
Investment, Identifier [Axis]: Cronos Crimson Holdings, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13] 0.23%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13] $ 14,758,000  
Investment, Identifier [Axis]: Cronos Crimson Holdings, Inc. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13] 0.28%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13] $ 17,647,000  
Investment, Identifier [Axis]: Crumbl Enterprises, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13] 0.02%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13] $ 1,485,000  
Investment, Identifier [Axis]: Crumbl Enterprises, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 18,000  
Investment, Identifier [Axis]: Crumbl Enterprises, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 101,000  
Fair Value 0  
Investment, Identifier [Axis]: Cumming Group, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[9],[16]   1.44%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[16] 87,227,000  
Ending balance [3],[4],[9],[16]   $ 87,227,000
Investment, Identifier [Axis]: Cumming Group, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[6],[8],[9],[16]   0.16%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[8],[9],[16] $ 9,487,000  
Ending balance [3],[4],[6],[8],[9],[16]   $ 9,487,000
Investment, Identifier [Axis]: Cumming Group, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   3,161,000
Fair Value   0
Investment, Identifier [Axis]: Cumming Group, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   9,648,000
Fair Value   $ 0
Investment, Identifier [Axis]: CustomInk, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 2.80% [1],[2],[13],[15],[24] 2.69% [3],[4],[9],[16],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[16],[26] $ 163,594,000  
Ending balance $ 175,836,000 [1],[2],[13],[15],[24] $ 163,594,000 [3],[4],[9],[16],[26]
Investment, Identifier [Axis]: CustomInk, LLC - Series A Preferred Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.10% [1],[2],[13] 0.13% [3],[4],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[29] $ 7,844,000  
Ending balance $ 6,368,000 [1],[2],[13] $ 7,844,000 [3],[4],[29]
Investment, Identifier [Axis]: DCA Investment Holdings, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.49% [1],[2],[10],[13] 0.52% [3],[4],[5],[6],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[9] $ 31,506,000  
Ending balance $ 30,553,000 [1],[2],[10],[13] $ 31,506,000 [3],[4],[5],[6],[9]
Investment, Identifier [Axis]: DCA Investment Holdings, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.01% [1],[2],[10],[12],[13] 0.02% [3],[4],[5],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] $ 955,000  
Ending balance $ 926,000 [1],[2],[10],[12],[13] $ 955,000 [3],[4],[5],[8],[9]
Investment, Identifier [Axis]: DCA Investment Holdings, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   29,000
Fair Value   $ 0
Investment, Identifier [Axis]: DCG Acquisition Corp.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.61% [1],[2],[10],[13],[14] 0.58% [3],[4],[5],[6],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[9] $ 35,327,000  
Ending balance 38,594,000 [1],[2],[10],[13],[14] $ 35,327,000 [3],[4],[5],[6],[9]
Investment, Identifier [Axis]: DCG Acquisition Corp., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 2,375,000 5,937,000
Fair Value 0 (30,000)
Investment, Identifier [Axis]: DCG Acquisition Corp., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 5,937,000 5,937,000
Fair Value (59,000) $ (59,000)
Investment, Identifier [Axis]: DM Intermediate Parent LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[8],[9]   0.29%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 17,811,000  
Ending balance [3],[4],[5],[6],[8],[9]   $ 17,811,000
Investment, Identifier [Axis]: DM Intermediate Parent LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   7,809,000
Fair Value   (59,000)
Investment, Identifier [Axis]: DM Intermediate Parent LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   5,206,000
Fair Value   $ (78,000)
Investment, Identifier [Axis]: DM Intermediate Parent, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.29%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 17,994,000  
Investment, Identifier [Axis]: DM Intermediate Parent, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 7,809,000  
Fair Value (59,000)  
Investment, Identifier [Axis]: DM Intermediate Parent, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 5,206,000  
Fair Value (78,000)  
Investment, Identifier [Axis]: DTA Intermediate II Ltd. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[9],[27]   0.70%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[27] 42,754,000  
Ending balance [3],[4],[9],[27]   $ 42,754,000
Investment, Identifier [Axis]: DTA Intermediate II Ltd. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[6],[9],[16]   0.09%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[9],[16] $ 5,196,000  
Ending balance [3],[4],[6],[9],[16]   $ 5,196,000
Investment, Identifier [Axis]: DTA Intermediate II Ltd., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   14,000,000
Fair Value   0
Investment, Identifier [Axis]: DTA Intermediate II Ltd., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   10,769,000
Fair Value   $ 0
Investment, Identifier [Axis]: DTA Intermediate II, Ltd. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[13],[15] 0.67%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[13],[15] $ 41,900,000  
Investment, Identifier [Axis]: DTA Intermediate II, Ltd. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[13],[14],[15] 0.08%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[13],[14],[15] $ 4,902,000  
Investment, Identifier [Axis]: DTA Intermediate II, Ltd., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 14,000,000  
Fair Value 0  
Investment, Identifier [Axis]: DTA Intermediate II, Ltd., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 10,769,000  
Fair Value (162,000)  
Investment, Identifier [Axis]: DTA LP - Class A Common Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[9]   0.04%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 2,171,000  
Ending balance [3],[4],[9]   $ 2,171,000
Investment, Identifier [Axis]: DTA, LP - Class A Common Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[13] 0.03%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[13] $ 1,845,000  
Investment, Identifier [Axis]: Daylight Beta Parent, LLC (Benefytt Technologies, Inc.)    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [12] 0.01% [1],[2],[13],[17],[23],[24] 0.02% [3],[4],[8],[9],[18],[25],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[8],[9],[12],[18],[25],[26] $ 1,381,000  
Ending balance [12] 854,000 [1],[2],[13],[17],[23],[24] $ 1,381,000 [3],[4],[8],[9],[18],[25],[26]
Investment, Identifier [Axis]: Dechra Pharmaceuticals Holdings Ltd 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[6],[7],[8],[9],[18]   0.02%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[7],[8],[9],[18] 1,062,000  
Ending balance [3],[4],[6],[7],[8],[9],[18]   $ 1,062,000
Investment, Identifier [Axis]: Dechra Pharmaceuticals Holdings Ltd 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[7],[8],[9]   0.02%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[7],[8],[9] 1,032,000  
Ending balance [3],[4],[5],[6],[7],[8],[9]   $ 1,032,000
Investment, Identifier [Axis]: Dechra Pharmaceuticals Holdings Ltd, Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments   260,000
Fair Value   (3,000)
Investment, Identifier [Axis]: Dechra Pharmaceuticals Holdings Ltd, Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments   218,000
Fair Value   $ (3,000)
Investment, Identifier [Axis]: Dellner Couplers Group AB    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[7],[8],[18]   0.02%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[8],[18] $ 1,026,000  
Ending balance [3],[4],[7],[8],[18]   $ 1,026,000
Investment, Identifier [Axis]: Dellner Couplers Group, AB    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[17] 0.02%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[17] $ 1,184,000  
Investment, Identifier [Axis]: Denali Bidco Ltd 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[6],[7],[8],[9],[16]   0.08%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[7],[8],[9],[16] 5,033,000  
Ending balance [3],[4],[6],[7],[8],[9],[16]   $ 5,033,000
Investment, Identifier [Axis]: Denali Bidco Ltd 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[7],[8],[9],[18]   0.02%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[8],[9],[18] 1,207,000  
Ending balance [3],[4],[7],[8],[9],[18]   $ 1,207,000
Investment, Identifier [Axis]: Denali Bidco Ltd 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[7],[8],[9],[18]   0.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[8],[9],[18] 273,000  
Ending balance [3],[4],[7],[8],[9],[18]   $ 273,000
Investment, Identifier [Axis]: Denali Bidco Ltd 4    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[7],[8],[9],[18]   0.03%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[8],[9],[18] $ 1,691,000  
Ending balance [3],[4],[7],[8],[9],[18]   $ 1,691,000
Investment, Identifier [Axis]: Denali Bidco Ltd, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   300,000
Fair Value   $ (3,000)
Investment, Identifier [Axis]: Denali Bidco, Ltd. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[11],[12],[13],[14] 0.09%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[11],[12],[13],[14] $ 5,518,000  
Investment, Identifier [Axis]: Denali Bidco, Ltd. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[17] 0.02%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[17] $ 1,373,000  
Investment, Identifier [Axis]: Denali Bidco, Ltd. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[17] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[17] $ 310,000  
Investment, Identifier [Axis]: Denali Bidco, Ltd. 4    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[17] 0.03%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[17] $ 1,923,000  
Investment, Identifier [Axis]: Denali Bidco, Ltd., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 300,000  
Fair Value (3,000)  
Investment, Identifier [Axis]: Descartes Holdings, Inc - Class A Common Stock    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[9]   0.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 3,000  
Ending balance [3],[4],[9]   $ 3,000
Investment, Identifier [Axis]: Descartes Holdings, Inc. - Class A Common Stock    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[13] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[13] $ 0  
Investment, Identifier [Axis]: Diligent Corp 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[9]   0.82%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] 49,683,000  
Ending balance [3],[4],[5],[9]   $ 49,683,000
Investment, Identifier [Axis]: Diligent Corp 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[9]   0.14%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 8,517,000  
Ending balance [3],[4],[5],[9]   $ 8,517,000
Investment, Identifier [Axis]: Diligent Corp. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13] 0.79%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13] $ 49,683,000  
Investment, Identifier [Axis]: Diligent Corp. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13] 0.14%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13] $ 8,517,000  
Investment, Identifier [Axis]: Discovery Education, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.45% [1],[2],[10],[13] 0.45% [3],[4],[5],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 27,596,000  
Ending balance $ 28,172,000 [1],[2],[10],[13] $ 27,596,000 [3],[4],[5],[9]
Investment, Identifier [Axis]: Discovery Education, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.04% [1],[2],[10],[12],[13] 0.03% [3],[4],[5],[6],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 1,726,000  
Ending balance $ 2,479,000 [1],[2],[10],[12],[13] $ 1,726,000 [3],[4],[5],[6],[8],[9]
Investment, Identifier [Axis]: Discovery Education, Inc. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.05% [1],[2],[10],[12],[13] 0.05% [3],[4],[8],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[8],[9],[16] $ 3,106,000  
Ending balance $ 3,170,000 [1],[2],[10],[12],[13] $ 3,106,000 [3],[4],[8],[9],[16]
Investment, Identifier [Axis]: Discovery Education, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   767,000
Fair Value   $ 0
Investment, Identifier [Axis]: Divisions Holding Corp.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.03%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 1,593,000  
Investment, Identifier [Axis]: Divisions Holding Corp., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 140,000  
Fair Value (1,000)  
Investment, Identifier [Axis]: Doc Generici (Diocle S.p.A.)    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[6],[7],[8],[9],[18]   0.03%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[7],[8],[9],[18] $ 1,808,000  
Ending balance [3],[4],[6],[7],[8],[9],[18]   $ 1,808,000
Investment, Identifier [Axis]: Doc Generici (Diocle S.p.A.), Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   1,682,000
Fair Value   $ (13,000)
Investment, Identifier [Axis]: Doit International, Ltd.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[12],[13],[14],[15] 0.18%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[12],[13],[14],[15] $ 11,229,000  
Investment, Identifier [Axis]: Doit International, Ltd., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 11,606,000  
Fair Value (87,000)  
Investment, Identifier [Axis]: Doit International, Ltd., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 5,803,000  
Fair Value $ (87,000)  
Investment, Identifier [Axis]: Dolcetto Holdco S.p.A. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[17] 0.03%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[17] $ 2,071,000  
Investment, Identifier [Axis]: Dolcetto Holdco S.p.A. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[17] 0.03%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[17] $ 2,066,000  
Investment, Identifier [Axis]: Dropbox Inc 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[7],[8],[9]   0.43%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[7],[8],[9] 26,150,000  
Ending balance [3],[4],[5],[7],[8],[9]   $ 26,150,000
Investment, Identifier [Axis]: Dropbox Inc 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[7],[8],[9],[26]   0.57%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[7],[8],[9],[26] $ 34,426,000  
Ending balance [3],[4],[5],[6],[7],[8],[9],[26]   $ 34,426,000
Investment, Identifier [Axis]: Dropbox Inc, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   88,235,000
Fair Value   $ (441,000)
Investment, Identifier [Axis]: Dropbox, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[11],[13],[14],[24] 0.55%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[11],[13],[14],[24] $ 34,325,000  
Investment, Identifier [Axis]: Dropbox, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 88,235,000  
Fair Value (441,000)  
Investment, Identifier [Axis]: Duro Dyne National Corp    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[9]   0.55%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[9] $ 33,185,000  
Ending balance [3],[4],[5],[6],[9]   $ 33,185,000
Investment, Identifier [Axis]: Duro Dyne National Corp, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   6,002,000
Fair Value   (30,000)
Investment, Identifier [Axis]: Duro Dyne National Corp, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   6,002,000
Fair Value   $ (60,000)
Investment, Identifier [Axis]: Duro Dyne National Corp. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13] 0.53%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13] $ 33,443,000  
Investment, Identifier [Axis]: Duro Dyne National Corp. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 450,000  
Investment, Identifier [Axis]: Duro Dyne National Corp., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 6,002,000  
Fair Value (30,000)  
Investment, Identifier [Axis]: Duro Dyne National Corp., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 5,522,000  
Fair Value 0  
Investment, Identifier [Axis]: Dwyer Instruments LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[8],[9]   0.13%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] 8,150,000  
Ending balance [3],[4],[5],[8],[9]   $ 8,150,000
Investment, Identifier [Axis]: Dwyer Instruments LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[8],[9]   0.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 167,000  
Ending balance [3],[4],[5],[6],[8],[9]   $ 167,000
Investment, Identifier [Axis]: Dwyer Instruments LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   1,069,000
Fair Value   (5,000)
Investment, Identifier [Axis]: Dwyer Instruments LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   1,098,000
Fair Value   $ 0
Investment, Identifier [Axis]: Dwyer Instruments, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.13%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 8,316,000  
Investment, Identifier [Axis]: Dwyer Instruments, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 1,069,000  
Fair Value (5,000)  
Investment, Identifier [Axis]: Dwyer Instruments, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,106,000  
Fair Value $ 0  
Investment, Identifier [Axis]: EIS Acquisition Holdings, LP - Class A Common Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.11% [1],[2],[13] 0.14% [3],[4],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 8,752,000  
Ending balance $ 6,920,000 [1],[2],[13] $ 8,752,000 [3],[4],[9]
Investment, Identifier [Axis]: ELK Bidco, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[12],[13],[14],[19] 0.28%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[12],[13],[14],[19] $ 17,871,000  
Investment, Identifier [Axis]: ELK Bidco, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 3,747,000  
Fair Value (9,000)  
Investment, Identifier [Axis]: ELK Bidco, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 3,373,000  
Fair Value $ (17,000)  
Investment, Identifier [Axis]: EMB Purchaser, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13] 0.43%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13] $ 27,178,000  
Investment, Identifier [Axis]: EMB Purchaser, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.10%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 6,184,000  
Investment, Identifier [Axis]: EMB Purchaser, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 10,089,000  
Fair Value 0  
Investment, Identifier [Axis]: EMB Purchaser, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 3,294,000  
Fair Value (33,000)  
Investment, Identifier [Axis]: ENV Bidco AB 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[7],[8],[9]   0.02%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[7],[8],[9] 1,115,000  
Ending balance [3],[4],[5],[7],[8],[9]   $ 1,115,000
Investment, Identifier [Axis]: ENV Bidco AB 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[6],[7],[8],[9],[18]   0.02%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[7],[8],[9],[18] $ 1,381,000  
Ending balance [3],[4],[6],[7],[8],[9],[18]   $ 1,381,000
Investment, Identifier [Axis]: ENV Bidco AB, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   302,000
Fair Value   $ 0
Investment, Identifier [Axis]: ENV Bidco, AB 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[11],[12],[13] 0.02%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[11],[12],[13] $ 1,115,000  
Investment, Identifier [Axis]: ENV Bidco, AB 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[14],[17] 0.02%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[14],[17] $ 1,571,000  
Investment, Identifier [Axis]: ENV Bidco, AB, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 302,000  
Fair Value (4,000)  
Investment, Identifier [Axis]: Eagle Midstream Canada Finance Inc    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[7],[9]   0.81%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[7],[9] $ 49,396,000  
Ending balance [3],[4],[5],[7],[9]   $ 49,396,000
Investment, Identifier [Axis]: Eagle Midstream Canada Finance, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[11],[13] 0.79%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[11],[13] $ 49,396,000  
Investment, Identifier [Axis]: East River Bidco, GmbH    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[13],[14],[17] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[13],[14],[17] $ 104,000  
Investment, Identifier [Axis]: East River Bidco, GmbH, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 39,000  
Fair Value 0  
Investment, Identifier [Axis]: Eden Acquisitionco Ltd    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[7],[9]   0.33%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[7],[9] $ 19,787,000  
Ending balance [3],[4],[5],[6],[7],[9]   $ 19,787,000
Investment, Identifier [Axis]: Eden Acquisitionco Ltd, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   43,344,000
Fair Value   $ (601,000)
Investment, Identifier [Axis]: Eden Acquisitionco, Ltd.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[11],[13],[14] 0.54%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[11],[13],[14] $ 34,013,000  
Investment, Identifier [Axis]: Eden Acquisitionco, Ltd., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 29,230,000  
Fair Value (472,000)  
Investment, Identifier [Axis]: Edifecs, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[9]   0.22%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] 13,572,000  
Ending balance [3],[4],[5],[9]   $ 13,572,000
Investment, Identifier [Axis]: Edifecs, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[9],[16]   3.60%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[16] 218,935,000  
Ending balance [3],[4],[9],[16]   $ 218,935,000
Investment, Identifier [Axis]: Edison Bidco AS    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[6],[7],[8],[9],[18]   0.01%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[7],[8],[9],[18] $ 342,000  
Ending balance [3],[4],[6],[7],[8],[9],[18]   $ 342,000
Investment, Identifier [Axis]: Edison Bidco AS, Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments   655,000
Fair Value   0
Investment, Identifier [Axis]: Edison Bidco AS, Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments   1,875,000
Fair Value   $ 0
Investment, Identifier [Axis]: Edison Bidco, AS    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[14],[17] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[14],[17] $ 336,000  
Investment, Identifier [Axis]: Edison Bidco, AS, Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments 687,000  
Fair Value 0  
Investment, Identifier [Axis]: Edison Bidco, AS, Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments 3,161,000  
Fair Value $ (53,000)  
Investment, Identifier [Axis]: Elanco Animal Health, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[17] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[17] $ 883,000  
Investment, Identifier [Axis]: Elements Finco Ltd 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[7],[8],[9],[18]   0.08%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[8],[9],[18] 5,008,000  
Ending balance [3],[4],[7],[8],[9],[18]   $ 5,008,000
Investment, Identifier [Axis]: Elements Finco Ltd 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[7],[8],[9],[18]   0.40%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[8],[9],[18] 24,065,000  
Ending balance [3],[4],[7],[8],[9],[18]   $ 24,065,000
Investment, Identifier [Axis]: Elements Finco Ltd 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[7],[8],[9],[18]   0.10%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[8],[9],[18] 6,017,000  
Ending balance [3],[4],[7],[8],[9],[18]   $ 6,017,000
Investment, Identifier [Axis]: Elements Finco Ltd 4    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[7],[8],[9],[18]   0.18%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[8],[9],[18] 10,788,000  
Ending balance [3],[4],[7],[8],[9],[18]   $ 10,788,000
Investment, Identifier [Axis]: Elements Finco Ltd 5    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[7],[8],[9],[18]   0.07%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[8],[9],[18] $ 4,436,000  
Ending balance [3],[4],[7],[8],[9],[18]   $ 4,436,000
Investment, Identifier [Axis]: Elements Finco, Ltd. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[17] 0.08%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[17] $ 5,008,000  
Investment, Identifier [Axis]: Elements Finco, Ltd. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[17] 0.42%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[17] $ 26,698,000  
Investment, Identifier [Axis]: Elements Finco, Ltd. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[17] 0.10%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[17] $ 6,081,000  
Investment, Identifier [Axis]: Elements Finco, Ltd. 4    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[17] 0.19%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[17] $ 11,965,000  
Investment, Identifier [Axis]: Elements Finco, Ltd. 5    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[17] 0.08%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[17] $ 4,918,000  
Investment, Identifier [Axis]: Emergency Power Holdings, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[6],[9],[16]   0.75%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[9],[16] $ 45,809,000  
Ending balance [3],[4],[6],[9],[16]   $ 45,809,000
Investment, Identifier [Axis]: Emergency Power Holdings, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[13],[14],[15] 0.74%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[13],[14],[15] $ 46,582,000  
Investment, Identifier [Axis]: Emergency Power Holdings, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 13,589,000 14,586,000
Fair Value $ (136,000) $ (146,000)
Investment, Identifier [Axis]: Endeavor Schools Holdings, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.32% [1],[2],[13],[15] 0.35% [3],[4],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[16] $ 21,413,000  
Ending balance $ 20,324,000 [1],[2],[13],[15] $ 21,413,000 [3],[4],[9],[16]
Investment, Identifier [Axis]: Endeavor Schools Holdings, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.06% [1],[2],[12],[13],[15] 0.06% [3],[4],[6],[8],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[8],[9],[16] $ 3,885,000  
Ending balance $ 3,741,000 [1],[2],[12],[13],[15] $ 3,885,000 [3],[4],[6],[8],[9],[16]
Investment, Identifier [Axis]: Endeavor Schools Holdings, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   5,776,000
Fair Value   $ 0
Investment, Identifier [Axis]: Epoch Acquisition, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.38% [1],[2],[13],[15] 0.39% [3],[4],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[16] $ 23,807,000  
Ending balance 23,674,000 [1],[2],[13],[15] $ 23,807,000 [3],[4],[9],[16]
Investment, Identifier [Axis]: Essential Services Holding Corp    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[8],[9]   0.19%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 11,687,000  
Ending balance [3],[4],[5],[6],[8],[9]   $ 11,687,000
Investment, Identifier [Axis]: Essential Services Holding Corp, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   2,297,000
Fair Value   (11,000)
Investment, Identifier [Axis]: Essential Services Holding Corp, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   1,436,000
Fair Value   $ (14,000)
Investment, Identifier [Axis]: Essential Services Holding Corp.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.19%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 11,746,000  
Investment, Identifier [Axis]: Essential Services Holding Corp., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 2,297,000  
Fair Value (11,000)  
Investment, Identifier [Axis]: Essential Services Holding Corp., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,264,000  
Fair Value $ 0  
Investment, Identifier [Axis]: Everbridge Holdings, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.35% [1],[2],[10],[11],[13] 0.36% [3],[4],[5],[7],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[7],[9] $ 22,167,000  
Ending balance $ 22,111,000 [1],[2],[10],[11],[13] $ 22,167,000 [3],[4],[5],[7],[9]
Investment, Identifier [Axis]: Everbridge Holdings, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.03% [1],[2],[10],[11],[12],[13],[14] 0.04% [3],[4],[5],[6],[7],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[7],[8],[9] $ 2,158,000  
Ending balance 2,167,000 [1],[2],[10],[11],[12],[13],[14] $ 2,158,000 [3],[4],[5],[6],[7],[8],[9]
Investment, Identifier [Axis]: Everbridge Holdings, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 3,378,000 3,378,000
Fair Value 0 0
Investment, Identifier [Axis]: Everbridge Holdings, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 2,222,000 2,222,000
Fair Value $ 0 $ (6,000)
Investment, Identifier [Axis]: Expedition Holdco, LLC - Class A Common Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [1],[2],[13] 0.00% [3],[4],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 48,000  
Ending balance $ 49,000 [1],[2],[13] $ 48,000 [3],[4],[9]
Investment, Identifier [Axis]: Expedition Holdco, LLC - Class B Common Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[13] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[13] $ 14,000  
Investment, Identifier [Axis]: Expedition Holdco, LLC - Class B Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[9]   0.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 14,000  
Ending balance [3],[4],[9]   $ 14,000
Investment, Identifier [Axis]: Experity, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.19% [1],[2],[10],[12],[13] 0.19% [3],[4],[5],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] $ 11,845,000  
Ending balance $ 12,055,000 [1],[2],[10],[12],[13] $ 11,845,000 [3],[4],[5],[8],[9]
Investment, Identifier [Axis]: Experity, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.06% [1],[2],[10],[12],[13],[14] 0.06% [3],[4],[5],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] $ 3,785,000  
Ending balance 3,857,000 [1],[2],[10],[12],[13],[14] $ 3,785,000 [3],[4],[5],[8],[9]
Investment, Identifier [Axis]: Experity, Inc. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[8],[9]   0.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] 234,000  
Ending balance [3],[4],[5],[6],[8],[9]   $ 234,000
Investment, Identifier [Axis]: Experity, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 4,457,000 4,457,000
Fair Value (22,000) (22,000)
Investment, Identifier [Axis]: Experity, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,495,000 1,238,000
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Falcon Parent Holdings, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.36% [1],[2],[10],[12],[13],[14] 0.23% [3],[4],[5],[6],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 14,252,000  
Ending balance 22,396,000 [1],[2],[10],[12],[13],[14] $ 14,252,000 [3],[4],[5],[6],[8],[9]
Investment, Identifier [Axis]: Falcon Parent Holdings, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 1,699,000 4,470,000
Fair Value 0 (34,000)
Investment, Identifier [Axis]: Falcon Parent Holdings, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 2,669,000 2,669,000
Fair Value $ (40,000) $ (40,000)
Investment, Identifier [Axis]: Falcon Top Parent, LLC - Class A Common Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.01% [1],[2],[13] 0.01% [3],[4],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 773,000  
Ending balance $ 773,000 [1],[2],[13] $ 773,000 [3],[4],[9]
Investment, Identifier [Axis]: Fastener Distribution Holdings LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.49% [1],[2],[10],[13],[14] 0.50% [3],[4],[5],[6],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[9] $ 30,647,000  
Ending balance 30,648,000 [1],[2],[10],[13],[14] $ 30,647,000 [3],[4],[5],[6],[9]
Investment, Identifier [Axis]: Fastener Distribution Holdings LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   11,594,000
Fair Value   $ (58,000)
Investment, Identifier [Axis]: Fastener Distribution Holdings, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 11,594,000  
Fair Value $ (58,000)  
Investment, Identifier [Axis]: Fencing Supply Group Acquisition, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.81% [1],[2],[13],[15] 0.85% [3],[4],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[16] $ 51,688,000  
Ending balance 50,761,000 [1],[2],[13],[15] $ 51,688,000 [3],[4],[9],[16]
Investment, Identifier [Axis]: Fern Bidco Ltd 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[7],[8],[9],[18]   0.41%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[8],[9],[18] 25,117,000  
Ending balance [3],[4],[7],[8],[9],[18]   $ 25,117,000
Investment, Identifier [Axis]: Fern Bidco Ltd 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[6],[7],[8],[9],[18]   0.04%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[7],[8],[9],[18] $ 2,623,000  
Ending balance [3],[4],[6],[7],[8],[9],[18]   $ 2,623,000
Investment, Identifier [Axis]: Fern Bidco Ltd, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   10,035,000
Fair Value   $ 0
Investment, Identifier [Axis]: Fern Bidco, Ltd. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[17] 0.44%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[17] $ 27,401,000  
Investment, Identifier [Axis]: Fern Bidco, Ltd. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[14],[17] 0.04%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[14],[17] $ 2,806,000  
Investment, Identifier [Axis]: Fern Bidco, Ltd., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 10,035,000  
Fair Value 0  
Investment, Identifier [Axis]: Formulations Parent Corp.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[9]   0.14%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[9] $ 8,408,000  
Ending balance [3],[4],[5],[6],[9]   $ 8,408,000
Investment, Identifier [Axis]: Formulations Parent Corp., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   1,429,000
Fair Value   $ (14,000)
Investment, Identifier [Axis]: Foundation Risk Partners Corp. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.23% [1],[2],[10],[13] 0.24% [3],[4],[5],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 14,433,000  
Ending balance $ 14,359,000 [1],[2],[10],[13] $ 14,433,000 [3],[4],[5],[9]
Investment, Identifier [Axis]: Foundation Risk Partners Corp. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.08% [1],[2],[10],[13] 0.08% [3],[4],[5],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 4,785,000  
Ending balance $ 4,760,000 [1],[2],[10],[13] $ 4,785,000 [3],[4],[5],[9]
Investment, Identifier [Axis]: Foundation Risk Partners Corp. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.11% [1],[2],[10],[13] 0.11% [3],[4],[5],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 6,892,000  
Ending balance $ 6,857,000 [1],[2],[10],[13] $ 6,892,000 [3],[4],[5],[9]
Investment, Identifier [Axis]: Foundation Risk Partners Corp. 4    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.07% [1],[2],[10],[12],[13],[14] 0.04% [3],[4],[5],[6],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 2,275,000  
Ending balance 4,236,000 [1],[2],[10],[12],[13],[14] $ 2,275,000 [3],[4],[5],[6],[8],[9]
Investment, Identifier [Axis]: Foundation Risk Partners Corp., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   2,245,000
Fair Value   0
Investment, Identifier [Axis]: Foundation Risk Partners Corp., Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments 252,000  
Fair Value 0  
Investment, Identifier [Axis]: Foundation Risk Partners Corp., Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments 7,140,000  
Fair Value (18,000)  
Investment, Identifier [Axis]: Foundation Risk Partners Corp., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 4,101,000 4,101,000
Fair Value (62,000) $ (62,000)
Investment, Identifier [Axis]: Frontgrade Technologies Holdings, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[8],[9]   0.04%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 2,347,000  
Ending balance [3],[4],[5],[6],[8],[9]   $ 2,347,000
Investment, Identifier [Axis]: Frontgrade Technologies Holdings, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.04%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 2,335,000  
Investment, Identifier [Axis]: Frontgrade Technologies Holdings, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13] $ 354,000  
Investment, Identifier [Axis]: Frontgrade Technologies Holdings, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 516,000 516,000
Fair Value 0 $ 0
Investment, Identifier [Axis]: Frontline Road Safety Investments, LLC - Class A Common Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[9]   0.12%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 7,460,000  
Ending balance [3],[4],[9]   $ 7,460,000
Investment, Identifier [Axis]: Frontline Road Safety, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.24% [1],[2],[13],[17] 1.54% [3],[4],[5],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 93,849,000  
Ending balance $ 14,941,000 [1],[2],[13],[17] $ 93,849,000 [3],[4],[5],[9]
Investment, Identifier [Axis]: Frontline Road Safety, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.09% [1],[2],[12],[13],[14],[17] 0.18% [3],[4],[5],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 10,969,000  
Ending balance 5,746,000 [1],[2],[12],[13],[14],[17] $ 10,969,000 [3],[4],[5],[9]
Investment, Identifier [Axis]: Frontline Road Safety, LLC 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[9]   0.18%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[9] 10,919,000  
Ending balance [3],[4],[5],[6],[9]   $ 10,919,000
Investment, Identifier [Axis]: Frontline Road Safety, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 3,835,000 33,000
Fair Value 0 $ 0
Investment, Identifier [Axis]: Frontline Road Safety, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 2,004,000  
Fair Value $ 0  
Investment, Identifier [Axis]: FusionSite Midco, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[13],[14],[15] 0.91%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[13],[14],[15] $ 57,501,000  
Investment, Identifier [Axis]: FusionSite Midco, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[9],[16]   0.42%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[16] 25,721,000  
Ending balance [3],[4],[9],[16]   $ 25,721,000
Investment, Identifier [Axis]: FusionSite Midco, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[9],[16]   0.18%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[16] 11,124,000  
Ending balance [3],[4],[9],[16]   $ 11,124,000
Investment, Identifier [Axis]: FusionSite Midco, LLC 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[6],[8],[9],[16]   0.33%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[8],[9],[16] 19,889,000  
Ending balance [3],[4],[6],[8],[9],[16]   $ 19,889,000
Investment, Identifier [Axis]: FusionSite Midco, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 23,773,000 1,276,000
Fair Value (178,000) 0
Investment, Identifier [Axis]: FusionSite Midco, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 7,006,000 4,209,000
Fair Value $ (158,000) $ (95,000)
Investment, Identifier [Axis]: G&A Partners Holding Company II, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.53% [1],[2],[10],[13] 0.50% [3],[4],[9],[28]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[28] $ 30,095,000  
Ending balance $ 33,609,000 [1],[2],[10],[13] $ 30,095,000 [3],[4],[9],[28]
Investment, Identifier [Axis]: G&A Partners Holding Company II, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.33% [1],[2],[10],[12],[13] 0.02% [3],[4],[6],[8],[9],[28]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[8],[9],[28] $ 1,058,000  
Ending balance $ 20,665,000 [1],[2],[10],[12],[13] $ 1,058,000 [3],[4],[6],[8],[9],[28]
Investment, Identifier [Axis]: G&A Partners Holding Company II, LLC 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 592,000  
Investment, Identifier [Axis]: G&A Partners Holding Company II, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 8,811,000 11,967,000
Fair Value 0 0
Investment, Identifier [Axis]: G&A Partners Holding Company II, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 3,288,000 3,288,000
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: GCX Corporation Buyer, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.33% [1],[2],[10],[13] 0.35% [3],[4],[5],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 20,966,000  
Ending balance $ 20,649,000 [1],[2],[10],[13] $ 20,966,000 [3],[4],[5],[9]
Investment, Identifier [Axis]: GCX Corporation Buyer, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.08% [1],[2],[10],[13] 0.09% [3],[4],[5],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 5,309,000  
Ending balance $ 5,228,000 [1],[2],[10],[13] $ 5,309,000 [3],[4],[5],[9]
Investment, Identifier [Axis]: GCX Corporation Group Holdings, L.P. - Class A-2 Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [1],[2],[13] 0.00% [3],[4],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 291,000  
Ending balance $ 270,000 [1],[2],[13] $ 291,000 [3],[4],[9]
Investment, Identifier [Axis]: GI Ranger Intermediate, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13],[14] 0.26%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13],[14] $ 16,218,000  
Investment, Identifier [Axis]: GI Ranger Intermediate, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[9]   0.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[9] 134,000  
Ending balance [3],[4],[5],[6],[9]   $ 134,000
Investment, Identifier [Axis]: GI Ranger Intermediate, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[9]   0.27%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[9] 16,220,000  
Ending balance [3],[4],[5],[6],[9]   $ 16,220,000
Investment, Identifier [Axis]: GI Ranger Intermediate, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,200,000 1,060,000
Fair Value 0 $ 0
Investment, Identifier [Axis]: GS Acquisitionco Inc 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[8],[9]   0.01%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] 577,000  
Ending balance [3],[4],[5],[6],[8],[9]   $ 577,000
Investment, Identifier [Axis]: GS Acquisitionco Inc 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[6],[8],[9],[28]   0.09%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[8],[9],[28] $ 5,295,000  
Ending balance [3],[4],[6],[8],[9],[28]   $ 5,295,000
Investment, Identifier [Axis]: GS Acquisitionco Inc, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   2,053,000
Fair Value   0
Investment, Identifier [Axis]: GS Acquisitionco Inc, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   2,000,000
Fair Value   $ (10,000)
Investment, Identifier [Axis]: GS Acquisitionco, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.02%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 1,104,000  
Investment, Identifier [Axis]: GS Acquisitionco, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[12],[13],[15] 0.08%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[12],[13],[15] $ 5,277,000  
Investment, Identifier [Axis]: GS Acquisitionco, Inc., Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments 1,653,000  
Fair Value 0  
Investment, Identifier [Axis]: GS Acquisitionco, Inc., Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments 1,429,000  
Fair Value (4,000)  
Investment, Identifier [Axis]: GS Acquisitionco, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,852,000  
Fair Value 0  
Investment, Identifier [Axis]: GTCR Investors LP - Class A-1 Common Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[9]   0.01%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 465,000  
Ending balance [3],[4],[9]   $ 465,000
Investment, Identifier [Axis]: GTCR Investors, LP - Class A-1 Common Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[13] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[13] $ 500,000  
Investment, Identifier [Axis]: GTCR/Jupiter Blocker, LLC - Blocker Note    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[13] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[13] $ 6,000  
Investment, Identifier [Axis]: GTCR/Jupiter Blocker, LLC - Blocker Notes    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[9]   0.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 6,000  
Ending balance [3],[4],[9]   $ 6,000
Investment, Identifier [Axis]: GTCR/Jupiter Blocker, LLC - Class Z Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [1],[2],[13] 0.00% [3],[4],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 57,000  
Ending balance $ 63,000 [1],[2],[13] $ 57,000 [3],[4],[9]
Investment, Identifier [Axis]: Galway Borrower, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.23% [1],[2],[10],[12],[13] 0.24% [3],[4],[5],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] $ 14,788,000  
Ending balance $ 14,705,000 [1],[2],[10],[12],[13] $ 14,788,000 [3],[4],[5],[8],[9]
Investment, Identifier [Axis]: Galway Borrower, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.05% [1],[2],[10],[12],[13],[14] 0.01% [3],[4],[5],[6],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 834,000  
Ending balance $ 2,855,000 [1],[2],[10],[12],[13],[14] $ 834,000 [3],[4],[5],[6],[8],[9]
Investment, Identifier [Axis]: Galway Borrower, LLC 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.14% [1],[2],[10],[12],[13],[14] 0.01% [3],[4],[5],[6],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 691,000  
Ending balance 8,699,000 [1],[2],[10],[12],[13],[14] $ 691,000 [3],[4],[5],[6],[8],[9]
Investment, Identifier [Axis]: Galway Borrower, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 44,509,000 52,181,000
Fair Value 0 0
Investment, Identifier [Axis]: Galway Borrower, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 6,247,000 8,341,000
Fair Value 0 $ 0
Investment, Identifier [Axis]: Gannett Fleming Inc    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[9]   1.01%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[9] $ 61,655,000  
Ending balance [3],[4],[5],[6],[9]   $ 61,655,000
Investment, Identifier [Axis]: Gannett Fleming Inc, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   6,237,000
Fair Value   (94,000)
Investment, Identifier [Axis]: Gannett Fleming, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13],[14] 1.02%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13],[14] $ 64,196,000  
Investment, Identifier [Axis]: Gannett Fleming, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 6,237,000  
Fair Value $ (94,000)  
Investment, Identifier [Axis]: Gatekeeper Systems Inc, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   10,584,000
Fair Value   (106,000)
Investment, Identifier [Axis]: Gatekeeper Systems Inc, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   1,588,000
Fair Value   $ 0
Investment, Identifier [Axis]: Gatekeeper Systems, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.69% [1],[2],[10],[13] 0.73% [3],[4],[5],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 44,114,000  
Ending balance $ 43,451,000 [1],[2],[10],[13] $ 44,114,000 [3],[4],[5],[9]
Investment, Identifier [Axis]: Gatekeeper Systems, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.07% [1],[2],[10],[12],[13],[14] 0.02% [3],[4],[5],[6],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 1,458,000  
Ending balance 4,704,000 [1],[2],[10],[12],[13],[14] $ 1,458,000 [3],[4],[5],[6],[8],[9]
Investment, Identifier [Axis]: Gatekeeper Systems, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 7,218,000  
Fair Value 0  
Investment, Identifier [Axis]: Gatekeeper Systems, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,588,000  
Fair Value $ 0  
Investment, Identifier [Axis]: Genstar Neptune Blocker, LLC - Blocker Note    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [1],[2],[13] 0.00% [3],[4],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 9,000  
Ending balance $ 9,000 [1],[2],[13] $ 9,000 [3],[4],[9]
Investment, Identifier [Axis]: Genstar Neptune Blocker, LLC - Blocker Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.01% [1],[2],[13] 0.01% [3],[4],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 336,000  
Ending balance $ 368,000 [1],[2],[13] $ 336,000 [3],[4],[9]
Investment, Identifier [Axis]: Genstar Neptune Blocker, LLC - Class Z Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [1],[2],[13] 0.00% [3],[4],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 79,000  
Ending balance $ 87,000 [1],[2],[13] $ 79,000 [3],[4],[9]
Investment, Identifier [Axis]: Genuine Cable Group, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 2.48% [1],[2],[10],[13] 2.60% [3],[4],[5],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 158,176,000  
Ending balance 155,703,000 [1],[2],[10],[13] $ 158,176,000 [3],[4],[5],[9]
Investment, Identifier [Axis]: Gigamon Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[9],[16]   0.11%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[16] 6,798,000  
Ending balance [3],[4],[9],[16]   $ 6,798,000
Investment, Identifier [Axis]: Gigamon Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[8],[9]   0.01%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] $ 410,000  
Ending balance [3],[4],[5],[8],[9]   $ 410,000
Investment, Identifier [Axis]: Gigamon, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13] 0.11%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13] $ 6,690,000  
Investment, Identifier [Axis]: Gigamon, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 318,000  
Investment, Identifier [Axis]: Gigamon, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 87,000  
Fair Value 0  
Investment, Identifier [Axis]: Gimlet Bidco GmbH 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[7],[9],[18]   0.51%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[9],[18] 31,242,000  
Ending balance [3],[4],[7],[9],[18]   $ 31,242,000
Investment, Identifier [Axis]: Gimlet Bidco GmbH 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[6],[7],[9],[18]   0.08%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[7],[9],[18] $ 4,946,000  
Ending balance [3],[4],[6],[7],[9],[18]   $ 4,946,000
Investment, Identifier [Axis]: Gimlet Bidco GmbH, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   8,040,000
Fair Value   $ 0
Investment, Identifier [Axis]: Gimlet Bidco, GmbH 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[13],[17] 0.57%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[13],[17] $ 36,069,000  
Investment, Identifier [Axis]: Gimlet Bidco, GmbH 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[13],[14],[17] 0.16%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[13],[14],[17] $ 10,223,000  
Investment, Identifier [Axis]: Gimlet Bidco, GmbH, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 4,063,000  
Fair Value $ 0  
Investment, Identifier [Axis]: Go Car Wash Management Corp.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.34% [1],[2],[13],[15] 0.36% [3],[4],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[16] $ 21,717,000  
Ending balance 21,606,000 [1],[2],[13],[15] $ 21,717,000 [3],[4],[9],[16]
Investment, Identifier [Axis]: Gorilla Investor LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[9]   0.41%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 24,695,000  
Ending balance [3],[4],[5],[9]   $ 24,695,000
Investment, Identifier [Axis]: Gorilla Investor, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13] 0.39%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13] $ 24,557,000  
Investment, Identifier [Axis]: GovernmentJobs.com, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.14% [1],[2],[10],[13],[14] 0.14% [3],[4],[5],[6],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[9] $ 8,447,000  
Ending balance 8,620,000 [1],[2],[10],[13],[14] $ 8,447,000 [3],[4],[5],[6],[9]
Investment, Identifier [Axis]: GovernmentJobs.com, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 2,086,000 2,086,000
Fair Value 0 0
Investment, Identifier [Axis]: GovernmentJobs.com, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 956,000 1,153,000
Fair Value 0 $ (18,000)
Investment, Identifier [Axis]: Granicus Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[9]   0.29%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] 17,509,000  
Ending balance [3],[4],[5],[9]   $ 17,509,000
Investment, Identifier [Axis]: Granicus Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[9]   0.08%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[9] $ 4,665,000  
Ending balance [3],[4],[5],[6],[9]   $ 4,665,000
Investment, Identifier [Axis]: Granicus Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   817,000
Fair Value   (4,000)
Investment, Identifier [Axis]: Granicus Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   2,448,000
Fair Value   $ 0
Investment, Identifier [Axis]: Granicus, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13] 0.28%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13] $ 17,618,000  
Investment, Identifier [Axis]: Granicus, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13] 0.08%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13] $ 4,741,000  
Investment, Identifier [Axis]: Granicus, Inc. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 339,000  
Investment, Identifier [Axis]: Granicus, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 817,000  
Fair Value (4,000)  
Investment, Identifier [Axis]: Granicus, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 2,105,000  
Fair Value $ 0  
Investment, Identifier [Axis]: Graphpad Software, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.38% [1],[2],[10],[13] 0.40% [3],[4],[5],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 24,085,000  
Ending balance $ 23,964,000 [1],[2],[10],[13] $ 24,085,000 [3],[4],[5],[9]
Investment, Identifier [Axis]: Graphpad Software, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.01% [1],[2],[10],[12],[13],[14] 0.01% [3],[4],[5],[6],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 591,000  
Ending balance 588,000 [1],[2],[10],[12],[13],[14] $ 591,000 [3],[4],[5],[6],[8],[9]
Investment, Identifier [Axis]: Graphpad Software, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 5,433,000 5,433,000
Fair Value 0 0
Investment, Identifier [Axis]: Graphpad Software, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 2,264,000 2,264,000
Fair Value (11,000) (11,000)
Investment, Identifier [Axis]: Grid Alliance Partners LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 4,718,000  
Fair Value 0  
Investment, Identifier [Axis]: Grid Alliance Partners LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 2,949,000  
Fair Value 0  
Investment, Identifier [Axis]: Grid Alliance Partners LLC, Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 15,333,000  
Fair Value 0  
Investment, Identifier [Axis]: Griffon Bidco, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 4,031,000  
Fair Value 0  
Investment, Identifier [Axis]: Griffon Bidco, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 4,031,000  
Fair Value 0  
Investment, Identifier [Axis]: Griffon Bidco, Inc., Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 22,170,000  
Fair Value $ 0  
Investment, Identifier [Axis]: Ground Penetrating Radar Systems LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   563,000
Fair Value   0
Investment, Identifier [Axis]: Ground Penetrating Radar Systems LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   300,000
Fair Value   0
Investment, Identifier [Axis]: Ground Penetrating Radar Systems LLC, Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   2,929,000
Fair Value   $ 0
Investment, Identifier [Axis]: Ground Penetrating Radar Systems, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13] 0.05%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13] $ 2,936,000  
Investment, Identifier [Axis]: Ground Penetrating Radar Systems, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 52,000  
Investment, Identifier [Axis]: Ground Penetrating Radar Systems, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 569,000  
Fair Value (3,000)  
Investment, Identifier [Axis]: Ground Penetrating Radar Systems, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 247,000  
Fair Value $ 0  
Investment, Identifier [Axis]: Guidehouse, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 4.97% [1],[2],[10],[13] 5.12% [3],[4],[5],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 311,085,000  
Ending balance 312,623,000 [1],[2],[10],[13] $ 311,085,000 [3],[4],[5],[9]
Investment, Identifier [Axis]: Gusto Sing Bidco Pte Ltd    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[7],[8],[9]   0.01%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[7],[8],[9] $ 612,000  
Ending balance [3],[4],[5],[6],[7],[8],[9]   $ 612,000
Investment, Identifier [Axis]: Gusto Sing Bidco Pte Ltd, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   101,000
Fair Value   0
Investment, Identifier [Axis]: Gusto Sing Bidco Pte, Ltd.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[11],[12],[13],[14] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[11],[12],[13],[14] $ 653,000  
Investment, Identifier [Axis]: Gusto Sing Bidco Pte, Ltd., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 101,000  
Fair Value $ 0  
Investment, Identifier [Axis]: Hargreaves Lansdown, Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   17,799,000
Fair Value   $ 0
Investment, Identifier [Axis]: Harp Finco, Ltd.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[17] 0.31%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[17] $ 19,516,000  
Investment, Identifier [Axis]: Healthcomp Holding Company, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 1.57% [1],[2],[10],[13] 0.19% [3],[4],[8],[9],[18]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[8],[9],[18] $ 11,429,000  
Ending balance $ 98,443,000 [1],[2],[10],[13] $ 11,429,000 [3],[4],[8],[9],[18]
Investment, Identifier [Axis]: Healthcomp Holding Company, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[12],[13],[17] 0.19%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[12],[13],[17] $ 11,839,000  
Investment, Identifier [Axis]: Healthcomp Holding Company, LLC - Preferred Interest    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.01% [1],[2],[13] 0.01% [3],[4],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 906,000  
Ending balance 788,000 [1],[2],[13] $ 906,000 [3],[4],[9]
Investment, Identifier [Axis]: Healthcomp Holding Company, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[9]   1.66%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 100,797,000  
Ending balance [3],[4],[5],[9]   $ 100,797,000
Investment, Identifier [Axis]: Helix TS, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.39% [1],[2],[10],[13],[14] 0.33% [3],[4],[5],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 20,195,000  
Ending balance $ 24,311,000 [1],[2],[10],[13],[14] $ 20,195,000 [3],[4],[5],[9]
Investment, Identifier [Axis]: Helix TS, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.33% [1],[2],[10],[13] 0.34% [3],[4],[5],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 20,554,000  
Ending balance $ 20,492,000 [1],[2],[10],[13] $ 20,554,000 [3],[4],[5],[9]
Investment, Identifier [Axis]: Helix TS, LLC 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.06% [1],[2],[10],[12],[13] 0.06% [3],[4],[5],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] $ 3,719,000  
Ending balance $ 3,700,000 [1],[2],[10],[12],[13] $ 3,719,000 [3],[4],[5],[8],[9]
Investment, Identifier [Axis]: Helix TS, LLC 4    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.02% [1],[2],[10],[12],[13] 0.01% [3],[4],[5],[6],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 826,000  
Ending balance 963,000 [1],[2],[10],[12],[13] $ 826,000 [3],[4],[5],[6],[8],[9]
Investment, Identifier [Axis]: Helix TS, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 9,715,000 14,165,000
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Higginbotham Insurance Agency, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.08% [1],[2],[11],[12],[13],[15] 0.08% [3],[4],[7],[8],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[8],[9],[16] $ 4,975,000  
Ending balance 4,950,000 [1],[2],[11],[12],[13],[15] $ 4,975,000 [3],[4],[7],[8],[9],[16]
Investment, Identifier [Axis]: High Street Buyer, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[9]   1.32%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[9] $ 80,232,000  
Ending balance [3],[4],[5],[6],[9]   $ 80,232,000
Investment, Identifier [Axis]: High Street Buyer, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13] 0.16%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13] $ 10,279,000  
Investment, Identifier [Axis]: High Street Buyer, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13],[14] 1.12%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13],[14] $ 70,732,000  
Investment, Identifier [Axis]: High Street Buyer, Inc. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.21%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 13,065,000  
Investment, Identifier [Axis]: High Street Buyer, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 7,878,000  
Fair Value 0  
Investment, Identifier [Axis]: High Street Buyer, Inc., Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments   1,187,000
Fair Value   0
Investment, Identifier [Axis]: High Street Buyer, Inc., Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments   20,953,000
Fair Value   0
Investment, Identifier [Axis]: High Street Buyer, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 2,254,000 2,254,000
Fair Value $ 0 $ (45,000)
Investment, Identifier [Axis]: Home Service TopCo IV, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[13],[14],[15] 0.59%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[13],[14],[15] $ 37,102,000  
Investment, Identifier [Axis]: Home Service TopCo IV, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[12],[13],[15] 0.05%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[12],[13],[15] $ 2,906,000  
Investment, Identifier [Axis]: Home Service TopCo IV, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 3,509,000  
Fair Value $ (38,000)  
Investment, Identifier [Axis]: Homecare Software Solutions, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.24% [1],[2],[10],[13] 0.24% [3],[4],[5],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 14,643,000  
Ending balance $ 14,866,000 [1],[2],[10],[13] $ 14,643,000 [3],[4],[5],[9]
Investment, Identifier [Axis]: Homecare Software Solutions, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.11% [1],[2],[10],[13] 0.11% [3],[4],[5],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 6,671,000  
Ending balance $ 6,773,000 [1],[2],[10],[13] $ 6,671,000 [3],[4],[5],[9]
Investment, Identifier [Axis]: Homecare Software Solutions, LLC 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.09% [1],[2],[10],[13] 0.09% [3],[4],[5],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 5,439,000  
Ending balance $ 5,522,000 [1],[2],[10],[13] $ 5,439,000 [3],[4],[5],[9]
Investment, Identifier [Axis]: Horizon CTS Buyer, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13],[14] 0.02%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13],[14] $ 1,066,000  
Investment, Identifier [Axis]: Horizon CTS Buyer, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 200,000  
Fair Value (1,000)  
Investment, Identifier [Axis]: Horizon CTS Buyer, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 230,000  
Fair Value 0  
Investment, Identifier [Axis]: IEM New Sub 2, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[9]   0.95%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[9] $ 57,825,000  
Ending balance [3],[4],[5],[6],[9]   $ 57,825,000
Investment, Identifier [Axis]: IEM New Sub 2, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13],[14] 0.92%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13],[14] $ 58,113,000  
Investment, Identifier [Axis]: IEM New Sub 2, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 13,164,000 13,164,000
Fair Value $ (99,000) $ (99,000)
Investment, Identifier [Axis]: IG Investments Holdings, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.73% [1],[2],[10],[13],[14] 0.76% [3],[4],[5],[6],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[9] $ 46,347,000  
Ending balance 46,115,000 [1],[2],[10],[13],[14] $ 46,347,000 [3],[4],[5],[6],[9]
Investment, Identifier [Axis]: IG Investments Holdings, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 4,416,000 4,416,000
Fair Value 0 $ 0
Investment, Identifier [Axis]: INK BC Bidco, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 4,189,000  
Fair Value 0  
Investment, Identifier [Axis]: INK BC Bidco, Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments 14,512,000  
Fair Value 0  
Investment, Identifier [Axis]: INK BC Bidco, Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments 3,239,000  
Fair Value 0  
Investment, Identifier [Axis]: IQN Holding Corp 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[8],[9]   0.08%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[8],[9] 4,892,000  
Ending balance [3],[4],[8],[9]   $ 4,892,000
Investment, Identifier [Axis]: IQN Holding Corp 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[8],[9]   0.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 231,000  
Ending balance [3],[4],[5],[6],[8],[9]   $ 231,000
Investment, Identifier [Axis]: IQN Holding Corp, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   359,000
Fair Value   $ 0
Investment, Identifier [Axis]: IQN Holding Corp. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13] 0.08%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13] $ 4,867,000  
Investment, Identifier [Axis]: IQN Holding Corp. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 432,000  
Investment, Identifier [Axis]: IQN Holding Corp. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[30] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[30] $ 600,000  
Investment, Identifier [Axis]: IQN Holding Corp., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 192,000  
Fair Value (1,000)  
Investment, Identifier [Axis]: IQN Holding Corp., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 157,000  
Fair Value 0  
Investment, Identifier [Axis]: IRI Group Holdings Inc 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[8],[9]   3.25%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] 197,500,000  
Ending balance [3],[4],[5],[8],[9]   $ 197,500,000
Investment, Identifier [Axis]: IRI Group Holdings Inc 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[8],[9]   0.05%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 2,760,000  
Ending balance [3],[4],[5],[6],[8],[9]   $ 2,760,000
Investment, Identifier [Axis]: IRI Group Holdings Inc, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   11,040,000
Fair Value   $ 0
Investment, Identifier [Axis]: IRI Group Holdings, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13],[14] 3.14%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13],[14] $ 197,497,000  
Investment, Identifier [Axis]: IRI Group Holdings, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 14,316,000  
Fair Value $ 0  
Investment, Identifier [Axis]: ISQ Hawkeye Holdco, Inc 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13] 0.02%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13] $ 974,000  
Investment, Identifier [Axis]: ISQ Hawkeye Holdco, Inc 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 64,000  
Investment, Identifier [Axis]: ISQ Hawkeye Holdco, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[8],[9]   0.02%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] 979,000  
Ending balance [3],[4],[5],[8],[9]   $ 979,000
Investment, Identifier [Axis]: ISQ Hawkeye Holdco, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[8],[9]   0.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] 34,000  
Ending balance [3],[4],[5],[6],[8],[9]   $ 34,000
Investment, Identifier [Axis]: ISQ Hawkeye Holdco, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 151,000 151,000
Fair Value 0 0
Investment, Identifier [Axis]: ISQ Hawkeye Holdco, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 54,000 83,000
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Icefall Parent, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.52% [1],[2],[13],[14],[15] 0.54% [3],[4],[6],[8],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[8],[9],[16] $ 32,592,000  
Ending balance 32,592,000 [1],[2],[13],[14],[15] $ 32,592,000 [3],[4],[6],[8],[9],[16]
Investment, Identifier [Axis]: Icefall Parent, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 3,104,000 3,104,000
Fair Value 0 $ 0
Investment, Identifier [Axis]: Identity Digital, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[9],[16],[27]   5.20%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[16],[27] 315,889,000  
Ending balance [3],[4],[9],[16],[27]   $ 315,889,000
Investment, Identifier [Axis]: Imagine 360 LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[8],[9]   0.28%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 16,957,000  
Ending balance [3],[4],[5],[6],[8],[9]   $ 16,957,000
Investment, Identifier [Axis]: Imagine 360 LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   2,413,000
Fair Value   (12,000)
Investment, Identifier [Axis]: Imagine 360 LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   1,514,000
Fair Value   $ (15,000)
Investment, Identifier [Axis]: Imagine 360, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13],[14] 0.27%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13],[14] $ 17,042,000  
Investment, Identifier [Axis]: Imagine 360, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 2,413,000  
Fair Value (12,000)  
Investment, Identifier [Axis]: Imagine 360, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,514,000  
Fair Value $ (15,000)  
Investment, Identifier [Axis]: Inception Fertility Ventures, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.73% [1],[2],[10],[13],[14] 0.75% [3],[4],[5],[6],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[9] $ 45,315,000  
Ending balance 45,680,000 [1],[2],[10],[13],[14] $ 45,315,000 [3],[4],[5],[6],[9]
Investment, Identifier [Axis]: Inception Fertility Ventures, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 10,488,000 10,488,000
Fair Value 0 0
Investment, Identifier [Axis]: Inception Fertility Ventures, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,763,000 797,000
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Infostretch Corporation    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.07% [1],[2],[10],[12],[13] 0.07% [3],[4],[5],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] $ 4,534,000  
Ending balance $ 4,438,000 [1],[2],[10],[12],[13] $ 4,534,000 [3],[4],[5],[8],[9]
Investment, Identifier [Axis]: Inovalon Holdings, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 2.90% [1],[2],[10],[13] 0.23% [3],[4],[5],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 14,061,000  
Ending balance $ 182,492,000 [1],[2],[10],[13] $ 14,061,000 [3],[4],[5],[9]
Investment, Identifier [Axis]: Inovalon Holdings, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13] 0.24%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13] $ 15,144,000  
Investment, Identifier [Axis]: Inovalon Holdings, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[9]   1.85%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] 112,337,000  
Ending balance [3],[4],[5],[9]   $ 112,337,000
Investment, Identifier [Axis]: Inovalon Holdings, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[9]   0.13%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] 8,155,000  
Ending balance [3],[4],[5],[9]   $ 8,155,000
Investment, Identifier [Axis]: Integrity Marketing Acquisition LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[9]   2.51%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[9] $ 152,532,000  
Ending balance [3],[4],[5],[6],[9]   $ 152,532,000
Investment, Identifier [Axis]: Integrity Marketing Acquisition LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   20,378,000
Fair Value   (43,000)
Investment, Identifier [Axis]: Integrity Marketing Acquisition LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   2,767,000
Fair Value   $ 0
Investment, Identifier [Axis]: Integrity Marketing Acquisition, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13],[14] 2.56%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13],[14] $ 160,739,000  
Investment, Identifier [Axis]: Integrity Marketing Acquisition, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 11,426,000  
Fair Value 0  
Investment, Identifier [Axis]: Integrity Marketing Acquisition, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 2,767,000  
Fair Value $ 0  
Investment, Identifier [Axis]: Investment Eight    
Schedule of Investments [Line Items]    
Interest rate, floor 3.00% 3.00%
Investment, Identifier [Axis]: Investment Five    
Schedule of Investments [Line Items]    
Interest rate, floor 1.25% 1.25%
Investment, Identifier [Axis]: Investment Four    
Schedule of Investments [Line Items]    
Interest rate, floor 1.00% 1.00%
Investment, Identifier [Axis]: Investment One    
Schedule of Investments [Line Items]    
Interest rate, floor 0.00% 0.00%
Investment, Identifier [Axis]: Investment Seven    
Schedule of Investments [Line Items]    
Interest rate, floor 2.00% 2.00%
Investment, Identifier [Axis]: Investment Six    
Schedule of Investments [Line Items]    
Interest rate, floor 1.50% 1.50%
Investment, Identifier [Axis]: Investment Three    
Schedule of Investments [Line Items]    
Interest rate, floor 0.75% 0.75%
Investment, Identifier [Axis]: Investment Two    
Schedule of Investments [Line Items]    
Interest rate, floor 0.50% 0.50%
Investment, Identifier [Axis]: Iris Buyer, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.40% [1],[2],[13],[15] 0.42% [3],[4],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[16] $ 25,453,000  
Ending balance $ 25,324,000 [1],[2],[13],[15] $ 25,453,000 [3],[4],[9],[16]
Investment, Identifier [Axis]: Iris Buyer, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.04% [1],[2],[12],[13],[15] 0.04% [3],[4],[6],[8],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[8],[9],[16] $ 2,282,000  
Ending balance $ 2,388,000 [1],[2],[12],[13],[15] $ 2,282,000 [3],[4],[6],[8],[9],[16]
Investment, Identifier [Axis]: Iris Buyer, LLC 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[12],[13],[14],[15] 0.02%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[12],[13],[14],[15] $ 1,102,000  
Investment, Identifier [Axis]: Iris Buyer, LLC 4    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[12],[13],[14],[15] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[12],[13],[14],[15] $ 907,000  
Investment, Identifier [Axis]: Iris Buyer, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 4,594,000 1,426,000
Fair Value 0 0
Investment, Identifier [Axis]: Iris Buyer, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 2,571,000 3,673,000
Fair Value $ 0 $ (101,000)
Investment, Identifier [Axis]: Italian Motorway Holdings S.à r.l    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 1.48% [1],[2],[11],[12],[13],[17] 1.34% [3],[4],[7],[8],[9],[18]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[8],[9],[18] $ 81,635,000  
Ending balance 92,834,000 [1],[2],[11],[12],[13],[17] $ 81,635,000 [3],[4],[7],[8],[9],[18]
Investment, Identifier [Axis]: JS Parent Inc    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[8],[9]   0.59%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 35,560,000  
Ending balance [3],[4],[5],[6],[8],[9]   $ 35,560,000
Investment, Identifier [Axis]: JS Parent Inc, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   3,452,000
Fair Value   $ (17,000)
Investment, Identifier [Axis]: JS Parent, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13],[14] 0.56%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13],[14] $ 35,381,000  
Investment, Identifier [Axis]: JS Parent, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 3,452,000  
Fair Value $ 0  
Investment, Identifier [Axis]: JSS Holdings, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 4.55% [1],[2],[10],[13] 4.64% [3],[4],[5],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 281,886,000  
Ending balance $ 286,201,000 [1],[2],[10],[13] $ 281,886,000 [3],[4],[5],[9]
Investment, Identifier [Axis]: JSS Holdings, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.08% [1],[2],[10],[12],[13] 0.08% [3],[4],[5],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] $ 4,868,000  
Ending balance $ 4,943,000 [1],[2],[10],[12],[13] $ 4,868,000 [3],[4],[5],[8],[9]
Investment, Identifier [Axis]: JSS Holdings, Inc. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.50% [1],[2],[10],[13],[14] 0.51% [3],[4],[5],[6],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 30,967,000  
Ending balance 31,436,000 [1],[2],[10],[13],[14] $ 30,967,000 [3],[4],[5],[6],[8],[9]
Investment, Identifier [Axis]: JSS Holdings, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 7,492,000 7,492,000
Fair Value $ (37,000) $ (37,000)
Investment, Identifier [Axis]: Jacuzzi Brands, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.17% [1],[2],[10],[12],[13] 0.17% [3],[4],[5],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] $ 10,469,000  
Ending balance $ 10,413,000 [1],[2],[10],[12],[13] $ 10,469,000 [3],[4],[5],[8],[9]
Investment, Identifier [Axis]: Jacuzzi Brands, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 1.14% [1],[2],[10],[13] 1.19% [3],[4],[5],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 72,027,000  
Ending balance $ 71,638,000 [1],[2],[10],[13] $ 72,027,000 [3],[4],[5],[9]
Investment, Identifier [Axis]: Java Buyer, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.07% [1],[2],[10],[13] 0.07% [3],[4],[5],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 4,171,000  
Ending balance $ 4,158,000 [1],[2],[10],[13] $ 4,171,000 [3],[4],[5],[9]
Investment, Identifier [Axis]: Java Buyer, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.05% [1],[2],[10],[12],[13] 0.05% [3],[4],[5],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] $ 2,896,000  
Ending balance $ 2,881,000 [1],[2],[10],[12],[13] $ 2,896,000 [3],[4],[5],[8],[9]
Investment, Identifier [Axis]: Java Buyer, Inc. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.03% [1],[2],[10],[12],[13] 0.04% [3],[4],[5],[6],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 2,731,000  
Ending balance $ 1,624,000 [1],[2],[10],[12],[13] $ 2,731,000 [3],[4],[5],[6],[8],[9]
Investment, Identifier [Axis]: Java Buyer, Inc. 4    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.04%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 2,438,000  
Investment, Identifier [Axis]: Java Buyer, Inc. 5    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 147,000  
Investment, Identifier [Axis]: Java Buyer, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 3,524,000 1,347,000
Fair Value 0 0
Investment, Identifier [Axis]: Java Buyer, Inc., Revolver 1    
Schedule of Investments [Line Items]    
Unfunded commitments 367,000 367,000
Fair Value 0 0
Investment, Identifier [Axis]: Java Buyer, Inc., Revolver 2    
Schedule of Investments [Line Items]    
Unfunded commitments 735,000 735,000
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Jayhawk Buyer, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 1.92% [1],[2],[13],[15] 0.08% [3],[4],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[16] $ 4,769,000  
Ending balance $ 120,659,000 [1],[2],[13],[15] $ 4,769,000 [3],[4],[9],[16]
Investment, Identifier [Axis]: Jayhawk Buyer, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[13],[15] 0.08%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[13],[15] $ 4,820,000  
Investment, Identifier [Axis]: Jayhawk Buyer, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[9],[16]   1.98%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[16] $ 120,404,000  
Ending balance [3],[4],[9],[16]   $ 120,404,000
Investment, Identifier [Axis]: Jayhawk Holdings, LP - Class A-1 Common Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [1],[2],[13] 0.00% [3],[4],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 79,000  
Ending balance $ 29,000 [1],[2],[13] $ 79,000 [3],[4],[9]
Investment, Identifier [Axis]: Jayhawk Holdings, LP - Class A-2 Common Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [1],[2],[13] 0.00% [3],[4],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 23,000  
Ending balance $ 16,000 [1],[2],[13] $ 23,000 [3],[4],[9]
Investment, Identifier [Axis]: Jupiter Ultimate Holdings, LLC - Class A Common Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [1],[2],[13] 0.00% [3],[4],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 0  
Ending balance $ 0 [1],[2],[13] $ 0 [3],[4],[9]
Investment, Identifier [Axis]: Jupiter Ultimate Holdings, LLC - Class B Common Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [1],[2],[13] 0.00% [3],[4],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 208,000  
Ending balance $ 219,000 [1],[2],[13] $ 208,000 [3],[4],[9]
Investment, Identifier [Axis]: Jupiter Ultimate Holdings, LLC - Class C Common Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [1],[2],[13] 0.00% [3],[4],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 220,000  
Ending balance 253,000 [1],[2],[13] $ 220,000 [3],[4],[9]
Investment, Identifier [Axis]: KEN Bidco Ltd    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[7],[8],[9]   0.19%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[7],[8],[9] $ 11,546,000  
Ending balance [3],[4],[5],[7],[8],[9]   $ 11,546,000
Investment, Identifier [Axis]: KEN Bidco, Ltd.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[11],[12],[13] 0.20%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[11],[12],[13] $ 12,589,000  
Investment, Identifier [Axis]: KKR Alberta Midstream Finance Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[7],[9]   0.44%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[7],[9] $ 26,870,000  
Ending balance [3],[4],[5],[7],[9]   $ 26,870,000
Investment, Identifier [Axis]: KKR Alberta Midstream Finance, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[11],[13] 0.43%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[11],[13] $ 26,870,000  
Investment, Identifier [Axis]: KPSKY Acquisition, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [10] 0.27% [1],[2],[13],[24] 0.29% [3],[4],[5],[9],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9],[10],[26] $ 17,408,000  
Ending balance [10] $ 17,069,000 [1],[2],[13],[24] $ 17,408,000 [3],[4],[5],[9],[26]
Investment, Identifier [Axis]: KPSKY Acquisition, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [10] 0.03% [1],[2],[12],[13],[24] 0.03% [3],[4],[5],[8],[9],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9],[10],[26] $ 2,005,000  
Ending balance [10] 1,966,000 [1],[2],[12],[13],[24] $ 2,005,000 [3],[4],[5],[8],[9],[26]
Investment, Identifier [Axis]: Kattegat Project Bidco AB 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[7],[8],[9],[18]   0.04%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[8],[9],[18] 2,605,000  
Ending balance [3],[4],[7],[8],[9],[18]   $ 2,605,000
Investment, Identifier [Axis]: Kattegat Project Bidco AB 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[6],[7],[8],[9],[18]   0.51%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[7],[8],[9],[18] $ 30,803,000  
Ending balance [3],[4],[6],[7],[8],[9],[18]   $ 30,803,000
Investment, Identifier [Axis]: Kattegat Project Bidco AB, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   7,030,000
Fair Value   $ (84,000)
Investment, Identifier [Axis]: Kattegat Project Bidco, AB 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[17] 0.04%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[17] $ 2,605,000  
Investment, Identifier [Axis]: Kattegat Project Bidco, AB 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[14],[17] 0.56%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[14],[17] $ 35,029,000  
Investment, Identifier [Axis]: Kattegat Project Bidco, AB, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 7,030,000  
Fair Value $ (96,000)  
Investment, Identifier [Axis]: King Bidco S.P.E.C.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[14],[17] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[14],[17] $ 201,000  
Investment, Identifier [Axis]: King Bidco S.P.E.C., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 88,000  
Fair Value (1,000)  
Investment, Identifier [Axis]: Knowledge Pro Buyer, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[9]   0.12%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[9] $ 7,559,000  
Ending balance [3],[4],[5],[6],[9]   $ 7,559,000
Investment, Identifier [Axis]: Knowledge Pro Buyer, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13],[14] 0.13%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13],[14] $ 8,385,000  
Investment, Identifier [Axis]: Knowledge Pro Buyer, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13] $ 102,000  
Investment, Identifier [Axis]: Knowledge Pro Buyer, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 2,031,000 906,000
Fair Value 0 0
Investment, Identifier [Axis]: Knowledge Pro Buyer, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   950,000
Fair Value   $ 0
Investment, Identifier [Axis]: Knowledge Pro Buyer, Inc., Revolver 1    
Schedule of Investments [Line Items]    
Unfunded commitments 1,032,000  
Fair Value 0  
Investment, Identifier [Axis]: Knowledge Pro Buyer, Inc., Revolver 2    
Schedule of Investments [Line Items]    
Unfunded commitments 406,000  
Fair Value $ (4,000)  
Investment, Identifier [Axis]: Kona Buyer, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [1],[2],[10],[12],[13],[14] 0.00% [3],[4],[5],[6],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 58,000  
Ending balance $ 76,000 [1],[2],[10],[12],[13],[14] $ 58,000 [3],[4],[5],[6],[8],[9]
Investment, Identifier [Axis]: Kona Buyer, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.02% [1],[2],[10],[12],[13] 0.02% [3],[4],[5],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] $ 1,039,000  
Ending balance 1,034,000 [1],[2],[10],[12],[13] $ 1,039,000 [3],[4],[5],[8],[9]
Investment, Identifier [Axis]: Kona Buyer, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 290,000  
Fair Value 0  
Investment, Identifier [Axis]: Kona Buyer, LLC, Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments   246,000
Fair Value   0
Investment, Identifier [Axis]: Kona Buyer, LLC, Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments   307,000
Fair Value   (2,000)
Investment, Identifier [Axis]: Kona Buyer, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 123,000 123,000
Fair Value $ (1,000) $ (1,000)
Investment, Identifier [Axis]: Kwol Acquisition, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.10% [1],[2],[10],[13],[14] 0.11% [3],[4],[5],[6],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 6,535,000  
Ending balance 6,521,000 [1],[2],[10],[13],[14] $ 6,535,000 [3],[4],[5],[6],[8],[9]
Investment, Identifier [Axis]: Kwol Acquisition, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 897,000 897,000
Fair Value $ 0 $ (2,000)
Investment, Identifier [Axis]: L&S Mechanical Acquisition, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13] 0.24%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13] $ 14,832,000  
Investment, Identifier [Axis]: L&S Mechanical Acquisition, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[8],[9]   0.23%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] 13,864,000  
Ending balance [3],[4],[5],[8],[9]   $ 13,864,000
Investment, Identifier [Axis]: L&S Mechanical Acquisition, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[8],[9]   0.02%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] $ 1,226,000  
Ending balance [3],[4],[5],[8],[9]   $ 1,226,000
Investment, Identifier [Axis]: LD Lower Holdings, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 1.28% [1],[2],[13],[15] 1.38% [3],[4],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[16] $ 83,671,000  
Ending balance $ 80,453,000 [1],[2],[13],[15] $ 83,671,000 [3],[4],[9],[16]
Investment, Identifier [Axis]: LPW Group Holdings, Inc    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[13],[14],[15] 0.42%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[13],[14],[15] $ 26,594,000  
Investment, Identifier [Axis]: LPW Group Holdings, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[6],[9],[16]   0.44%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[9],[16] 26,728,000  
Ending balance [3],[4],[6],[9],[16]   $ 26,728,000
Investment, Identifier [Axis]: LPW Group Holdings, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 5,373,000 5,373,000
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Legacy Intermediate, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.11% [1],[2],[10],[12],[13] 0.11% [3],[4],[5],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] $ 6,697,000  
Ending balance $ 6,663,000 [1],[2],[10],[12],[13] $ 6,697,000 [3],[4],[5],[8],[9]
Investment, Identifier [Axis]: Legacy Intermediate, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.02% [1],[2],[10],[12],[13] 0.02% [3],[4],[8],[9],[28]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[8],[9],[28] $ 1,290,000  
Ending balance 1,287,000 [1],[2],[10],[12],[13] $ 1,290,000 [3],[4],[8],[9],[28]
Investment, Identifier [Axis]: Lightbox Intermediate, LP    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[8],[9],[18]   0.03%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[8],[9],[18] $ 1,867,000  
Ending balance [3],[4],[8],[9],[18]   $ 1,867,000
Investment, Identifier [Axis]: Lindstrom, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 1.88% [1],[2],[13],[15] 1.96% [3],[4],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[16] $ 118,943,000  
Ending balance 118,442,000 [1],[2],[13],[15] $ 118,943,000 [3],[4],[9],[16]
Investment, Identifier [Axis]: Livingston International, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[7],[9]   2.02%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[7],[9] $ 122,571,000  
Ending balance [3],[4],[5],[7],[9]   $ 122,571,000
Investment, Identifier [Axis]: Lobos Parent, Inc. - Series A Preferred Shares    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.03% [1],[2],[13] 0.03% [3],[4],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 2,000,000  
Ending balance 2,155,000 [1],[2],[13] $ 2,000,000 [3],[4],[9]
Investment, Identifier [Axis]: LogicMonitor Inc    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[8],[9]   0.26%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 15,712,000  
Ending balance [3],[4],[5],[6],[8],[9]   $ 15,712,000
Investment, Identifier [Axis]: LogicMonitor Inc, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   1,992,000
Fair Value   (25,000)
Investment, Identifier [Axis]: LogicMonitor, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.25%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 15,712,000  
Investment, Identifier [Axis]: LogicMonitor, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,992,000  
Fair Value (25,000)  
Investment, Identifier [Axis]: Lsf12 Crown US Commercial Bidco LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   4,345,000
Fair Value   $ (36,000)
Investment, Identifier [Axis]: Lsf12 Crown US Commercial Bidco, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 4,345,000  
Fair Value $ (8,000)  
Investment, Identifier [Axis]: Lytx, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 1.34% [1],[2],[13],[15] 1.39% [3],[4],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[16] $ 84,454,000  
Ending balance $ 84,454,000 [1],[2],[13],[15] $ 84,454,000 [3],[4],[9],[16]
Investment, Identifier [Axis]: MAG DS Corp.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 1.22% [1],[2],[15] 1.23% [3],[4],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[16] $ 74,788,000  
Ending balance $ 76,551,000 [1],[2],[15] $ 74,788,000 [3],[4],[16]
Investment, Identifier [Axis]: MB2 Dental Solutions, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.37% [1],[2],[10],[13] 0.38% [3],[4],[5],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 23,162,000  
Ending balance $ 23,045,000 [1],[2],[10],[13] $ 23,162,000 [3],[4],[5],[9]
Investment, Identifier [Axis]: MB2 Dental Solutions, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.05% [1],[2],[10],[12],[13],[14] 0.03% [3],[4],[5],[6],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 1,667,000  
Ending balance $ 2,931,000 [1],[2],[10],[12],[13],[14] $ 1,667,000 [3],[4],[5],[6],[8],[9]
Investment, Identifier [Axis]: MB2 Dental Solutions, LLC 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.05% [1],[2],[10],[12],[13] 0.06% [3],[4],[5],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] $ 3,381,000  
Ending balance 3,408,000 [1],[2],[10],[12],[13] $ 3,381,000 [3],[4],[5],[8],[9]
Investment, Identifier [Axis]: MB2 Dental Solutions, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 5,315,000 6,570,000
Fair Value 0 0
Investment, Identifier [Axis]: MB2 Dental Solutions, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,382,000 1,382,000
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: MHE Intermediate Holdings, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.03% [1],[2],[12],[13],[14],[15] 0.03% [3],[4],[6],[8],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[8],[9],[16] $ 1,908,000  
Ending balance $ 1,941,000 [1],[2],[12],[13],[14],[15] $ 1,908,000 [3],[4],[6],[8],[9],[16]
Investment, Identifier [Axis]: MHE Intermediate Holdings, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [1],[2],[12],[13],[15] 0.00% [3],[4],[8],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[8],[9],[16] $ 76,000  
Ending balance $ 75,000 [1],[2],[12],[13],[15] $ 76,000 [3],[4],[8],[9],[16]
Investment, Identifier [Axis]: MHE Intermediate Holdings, LLC 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [1],[2],[12],[13],[15] 0.00% [3],[4],[8],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[8],[9],[16] $ 76,000  
Ending balance 75,000 [1],[2],[12],[13],[15] $ 76,000 [3],[4],[8],[9],[16]
Investment, Identifier [Axis]: MHE Intermediate Holdings, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 161,000 214,000
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: MPG Parent Holdings, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.17% [1],[2],[13],[15] 0.18% [3],[4],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[16] $ 10,872,000  
Ending balance $ 10,817,000 [1],[2],[13],[15] $ 10,872,000 [3],[4],[9],[16]
Investment, Identifier [Axis]: MPG Parent Holdings, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.04% [1],[2],[12],[13],[14],[15] 0.04% [3],[4],[6],[8],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[8],[9],[16] $ 2,646,000  
Ending balance 2,633,000 [1],[2],[12],[13],[14],[15] $ 2,646,000 [3],[4],[6],[8],[9],[16]
Investment, Identifier [Axis]: MPG Parent Holdings, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 3,087,000 3,087,000
Fair Value (23,000) (23,000)
Investment, Identifier [Axis]: MPG Parent Holdings, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,339,000 1,339,000
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: MRH Trowe Beteiligungsgesellschaft mbH    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[13],[14],[17] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[13],[14],[17] $ 410,000  
Investment, Identifier [Axis]: MRH Trowe Beteiligungsgesellschaft mbH, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 131,000  
Fair Value 0  
Investment, Identifier [Axis]: MRH Trowe Beteiligungsgesellschaft mbH, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 35,000  
Fair Value $ 0  
Investment, Identifier [Axis]: MRI Software, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.11% [1],[2],[15] 0.11% [3],[4],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[16] $ 6,742,000  
Ending balance $ 6,665,000 [1],[2],[15] $ 6,742,000 [3],[4],[16]
Investment, Identifier [Axis]: MRI Software, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 1.43% [1],[2],[15] 0.84% [3],[4],[6],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[9],[16] $ 50,879,000  
Ending balance $ 89,864,000 [1],[2],[15] $ 50,879,000 [3],[4],[6],[9],[16]
Investment, Identifier [Axis]: MRI Software, LLC 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [1],[2],[12],[13],[14],[15] 0.66% [3],[4],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[16] $ 40,020,000  
Ending balance 207,000 [1],[2],[12],[13],[14],[15] $ 40,020,000 [3],[4],[9],[16]
Investment, Identifier [Axis]: MRI Software, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 6,953,000 6,953,000
Fair Value 0 $ 0
Investment, Identifier [Axis]: Magic Bidco Inc 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[9]   0.33%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] 19,808,000  
Ending balance [3],[4],[5],[9]   $ 19,808,000
Investment, Identifier [Axis]: Magic Bidco Inc 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[8],[9]   0.04%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] 2,570,000  
Ending balance [3],[4],[5],[6],[8],[9]   $ 2,570,000
Investment, Identifier [Axis]: Magic Bidco Inc 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[8],[9]   0.01%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 740,000  
Ending balance [3],[4],[5],[6],[8],[9]   $ 740,000
Investment, Identifier [Axis]: Magic Bidco Inc, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   7,098,000
Fair Value   0
Investment, Identifier [Axis]: Magic Bidco Inc, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   1,088,000
Fair Value   $ 0
Investment, Identifier [Axis]: Magic Bidco, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13] 0.41%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13] $ 25,551,000  
Investment, Identifier [Axis]: Magic Bidco, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.04%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 2,722,000  
Investment, Identifier [Axis]: Magic Bidco, Inc. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 721,000  
Investment, Identifier [Axis]: Magic Bidco, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 7,098,000  
Fair Value 0  
Investment, Identifier [Axis]: Magic Bidco, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 955,000  
Fair Value $ 0  
Investment, Identifier [Axis]: Magnesium BorrowerCo, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.09% [1],[2],[10],[13] 0.09% [3],[4],[5],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] $ 5,628,000  
Ending balance $ 5,599,000 [1],[2],[10],[13] $ 5,628,000 [3],[4],[5],[8],[9]
Investment, Identifier [Axis]: Magnesium BorrowerCo, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [1],[2],[10],[12],[13] 0.00% [3],[4],[5],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] $ 140,000  
Ending balance $ 139,000 [1],[2],[10],[12],[13] $ 140,000 [3],[4],[5],[8],[9]
Investment, Identifier [Axis]: Magnesium BorrowerCo, Inc. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.07% [1],[2],[10],[12],[13] 0.07% [3],[4],[5],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] $ 4,224,000  
Ending balance $ 4,608,000 [1],[2],[10],[12],[13] $ 4,224,000 [3],[4],[5],[8],[9]
Investment, Identifier [Axis]: Magneto Components BuyCo, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.52% [1],[2],[10],[13],[14] 0.54% [3],[4],[5],[6],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[9] $ 32,631,000  
Ending balance 32,972,000 [1],[2],[10],[13],[14] $ 32,631,000 [3],[4],[5],[6],[9]
Investment, Identifier [Axis]: Magneto Components BuyCo, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   6,610,000
Fair Value   (83,000)
Investment, Identifier [Axis]: Magneto Components BuyCo, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 5,508,000 5,508,000
Fair Value $ (110,000) $ (110,000)
Investment, Identifier [Axis]: Mandolin Technology Holdings, Inc. - Series A Preferred Shares    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.06% [1],[2],[13] 0.06% [3],[4],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 3,781,000  
Ending balance 3,926,000 [1],[2],[13] $ 3,781,000 [3],[4],[9]
Investment, Identifier [Axis]: Mandolin Technology Intermediate Holdings, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[8],[9],[28]   0.05%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[8],[9],[28] $ 3,035,000  
Ending balance [3],[4],[8],[9],[28]   $ 3,035,000
Investment, Identifier [Axis]: Mandolin Technology Intermediate Holdings, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[12],[13],[19] 0.05%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[12],[13],[19] $ 3,066,000  
Investment, Identifier [Axis]: Mandolin Technology Intermediate Holdings, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.12% [1],[2],[12],[13],[19] 0.12% [3],[4],[8],[9],[28]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[8],[9],[28] $ 7,300,000  
Ending balance $ 7,346,000 [1],[2],[12],[13],[19] $ 7,300,000 [3],[4],[8],[9],[28]
Investment, Identifier [Axis]: Mandolin Technology Intermediate Holdings, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.10% [1],[2],[12],[13],[19] 0.11% [3],[4],[8],[9],[28]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[8],[9],[28] $ 6,619,000  
Ending balance $ 6,448,000 [1],[2],[12],[13],[19] $ 6,619,000 [3],[4],[8],[9],[28]
Investment, Identifier [Axis]: Mandolin Technology Intermediate Holdings, Inc. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [1],[2],[12],[13],[14],[17] 0.02% [3],[4],[8],[9],[18],[28]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[8],[9],[18],[28] $ 1,038,000  
Ending balance 154,000 [1],[2],[12],[13],[14],[17] $ 1,038,000 [3],[4],[8],[9],[18],[28]
Investment, Identifier [Axis]: Mandolin Technology Intermediate Holdings, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,004,000  
Fair Value $ 0  
Investment, Identifier [Axis]: Marcone Yellowstone Buyer, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.07% [1],[2],[10],[12],[13] 0.07% [3],[4],[5],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] $ 4,352,000  
Ending balance $ 4,424,000 [1],[2],[10],[12],[13] $ 4,352,000 [3],[4],[5],[8],[9]
Investment, Identifier [Axis]: Marcone Yellowstone Buyer, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.02% [1],[2],[10],[12],[13] 0.02% [3],[4],[5],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] $ 1,399,000  
Ending balance $ 1,422,000 [1],[2],[10],[12],[13] $ 1,399,000 [3],[4],[5],[8],[9]
Investment, Identifier [Axis]: Marcone Yellowstone Buyer, Inc. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.02% [1],[2],[10],[12],[13] 0.02% [3],[4],[5],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] $ 1,401,000  
Ending balance $ 1,424,000 [1],[2],[10],[12],[13] $ 1,401,000 [3],[4],[5],[8],[9]
Investment, Identifier [Axis]: Material Holdings, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.36% [1],[2],[10],[12],[13],[14],[21] 0.35% [3],[4],[5],[6],[8],[9],[22]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9],[22] $ 21,547,000  
Ending balance $ 22,380,000 [1],[2],[10],[12],[13],[14],[21] $ 21,547,000 [3],[4],[5],[6],[8],[9],[22]
Investment, Identifier [Axis]: Material Holdings, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.01% [1],[2],[10],[12],[13],[21],[23] 0.02% [3],[4],[5],[8],[9],[22],[25]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9],[22],[25] $ 1,397,000  
Ending balance 393,000 [1],[2],[10],[12],[13],[21],[23] $ 1,397,000 [3],[4],[5],[8],[9],[22],[25]
Investment, Identifier [Axis]: Material Holdings, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 2,999,000  
Fair Value 0  
Investment, Identifier [Axis]: Material Holdings, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 353,000 353,000
Fair Value $ (42,000) $ (42,000)
Investment, Identifier [Axis]: Material+ Holding Company, LLC - Class C Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [1],[2],[13],[21] 0.00% [3],[4],[9],[22]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[22] $ 0  
Ending balance 0 [1],[2],[13],[21] $ 0 [3],[4],[9],[22]
Investment, Identifier [Axis]: Maverick Acquisition, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[9],[16],[25]   0.20%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[16],[25] $ 12,273,000  
Ending balance [3],[4],[9],[16],[25]   $ 12,273,000
Investment, Identifier [Axis]: Maverick Acquisition, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[13],[15],[23] 0.16%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[13],[15],[23] $ 10,151,000  
Investment, Identifier [Axis]: Maverick Acquisition, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[12],[13],[14],[15] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[12],[13],[14],[15] $ 276,000  
Investment, Identifier [Axis]: Maverick Acquisition, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 96,000  
Fair Value $ 0  
Investment, Identifier [Axis]: Medallia, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 5.34% [1],[2],[10],[13] 5.87% [3],[4],[5],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 356,442,000  
Ending balance $ 335,599,000 [1],[2],[10],[13] $ 356,442,000 [3],[4],[5],[9]
Investment, Identifier [Axis]: Medallia, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.03% [1],[2],[10],[12],[13] 0.03% [3],[4],[5],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] $ 2,092,000  
Ending balance 1,969,000 [1],[2],[10],[12],[13] $ 2,092,000 [3],[4],[5],[8],[9]
Investment, Identifier [Axis]: Mercury Bidco Globe Limited    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[6],[7],[8],[9],[18]   0.98%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[7],[8],[9],[18] $ 59,401,000  
Ending balance [3],[4],[6],[7],[8],[9],[18]   $ 59,401,000
Investment, Identifier [Axis]: Mercury Bidco Globe Limited, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   14,933,000
Fair Value   $ (168,000)
Investment, Identifier [Axis]: Mercury Bidco Globe, Limited 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[14],[17] 1.09%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[14],[17] $ 68,254,000  
Investment, Identifier [Axis]: Mercury Bidco Globe, Limited 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[19] 0.07%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[19] $ 4,520,000  
Investment, Identifier [Axis]: Mercury Bidco Globe, Limited, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 8,003,000  
Fair Value $ 0  
Investment, Identifier [Axis]: Micross Topco, Inc. - Common Equity    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.10% [1],[2],[13] 0.12% [3],[4],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 7,426,000  
Ending balance $ 6,541,000 [1],[2],[13] $ 7,426,000 [3],[4],[9]
Investment, Identifier [Axis]: Mimecast Limited - LP Interest    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.01% [1],[2],[13] 0.01% [3],[4],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 721,000  
Ending balance 735,000 [1],[2],[13] $ 721,000 [3],[4],[9]
Investment, Identifier [Axis]: Minerva Bidco Ltd, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 6,556,000  
Fair Value 0  
Investment, Identifier [Axis]: Mode Holdings, L.P. - Class A-2 Common Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[9]   0.08%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 4,774,000  
Ending balance [3],[4],[9]   $ 4,774,000
Investment, Identifier [Axis]: Mode Holdings, LP - Class A-2 Common Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[13] 0.06%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[13] $ 3,841,000  
Investment, Identifier [Axis]: Mode Purchaser, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 2.13% [1],[2],[13],[15] 2.22% [3],[4],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[16] $ 135,164,000  
Ending balance $ 134,024,000 [1],[2],[13],[15] $ 135,164,000 [3],[4],[9],[16]
Investment, Identifier [Axis]: Mode Purchaser, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.06% [1],[2],[13],[15] 0.06% [3],[4],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[16] $ 3,858,000  
Ending balance $ 3,826,000 [1],[2],[13],[15] $ 3,858,000 [3],[4],[9],[16]
Investment, Identifier [Axis]: Modernizing Medicine, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.14%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 8,771,000  
Investment, Identifier [Axis]: Modernizing Medicine, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 827,000  
Fair Value (8,000)  
Investment, Identifier [Axis]: Monk Holding Co. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[9],[26]   0.08%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[26] 4,755,000  
Ending balance [3],[4],[9],[26]   $ 4,755,000
Investment, Identifier [Axis]: Monk Holding Co. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[8],[9]   0.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 288,000  
Ending balance [3],[4],[5],[6],[8],[9]   $ 288,000
Investment, Identifier [Axis]: Monk Holding Co., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   917,000
Fair Value   $ 0
Investment, Identifier [Axis]: Monk Holding, Co. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13],[24] 0.08%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13],[24] $ 4,730,000  
Investment, Identifier [Axis]: Monk Holding, Co. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.02%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 985,000  
Investment, Identifier [Axis]: Monk Holding, Co., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 217,000  
Fair Value $ 0  
Investment, Identifier [Axis]: Monterey Financing, S.à r.l. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [1],[2],[11],[12],[13],[17] 0.00% [3],[4],[7],[8],[9],[18]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[8],[9],[18] $ 189,000  
Ending balance $ 221,000 [1],[2],[11],[12],[13],[17] $ 189,000 [3],[4],[7],[8],[9],[18]
Investment, Identifier [Axis]: Monterey Financing, S.à r.l. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.02% [1],[2],[11],[12],[13],[17] 0.02% [3],[4],[7],[8],[9],[18]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[8],[9],[18] $ 987,000  
Ending balance $ 1,122,000 [1],[2],[11],[12],[13],[17] $ 987,000 [3],[4],[7],[8],[9],[18]
Investment, Identifier [Axis]: Monterey Financing, S.à r.l. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.01% [1],[2],[11],[12],[13],[17] 0.01% [3],[4],[7],[8],[9],[18]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[8],[9],[18] $ 669,000  
Ending balance $ 761,000 [1],[2],[11],[12],[13],[17] $ 669,000 [3],[4],[7],[8],[9],[18]
Investment, Identifier [Axis]: Monterey Financing, S.à r.l. 4    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.01% [1],[2],[11],[12],[13],[19] 0.01% [3],[4],[7],[8],[9],[28]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[8],[9],[28] $ 452,000  
Ending balance $ 511,000 [1],[2],[11],[12],[13],[19] $ 452,000 [3],[4],[7],[8],[9],[28]
Investment, Identifier [Axis]: More Cowbell II, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.13% [1],[2],[10],[13] 0.13% [3],[4],[5],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 7,917,000  
Ending balance $ 7,877,000 [1],[2],[10],[13] $ 7,917,000 [3],[4],[5],[9]
Investment, Identifier [Axis]: More Cowbell II, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [1],[2],[10],[12],[13],[14] 0.01% [3],[4],[5],[6],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 442,000  
Ending balance 216,000 [1],[2],[10],[12],[13],[14] $ 442,000 [3],[4],[5],[6],[8],[9]
Investment, Identifier [Axis]: More Cowbell II, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 916,000 916,000
Fair Value (11,000) (11,000)
Investment, Identifier [Axis]: More Cowbell II, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 906,000 679,000
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: NAVEX TopCo, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.96% [1],[2],[10],[13],[14] 1.00% [3],[4],[5],[6],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[9] $ 60,843,000  
Ending balance 60,537,000 [1],[2],[10],[13],[14] $ 60,843,000 [3],[4],[5],[6],[9]
Investment, Identifier [Axis]: NAVEX TopCo, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 5,394,000 5,394,000
Fair Value 0 $ 0
Investment, Identifier [Axis]: NC Ocala Co-Invest Beta, L.P. - LP Interest    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[9]   0.06%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 3,368,000  
Ending balance [3],[4],[9]   $ 3,368,000
Investment, Identifier [Axis]: NC Ocala Co-Invest Beta, LP - LP Interest    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[13] 0.05%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[13] $ 3,311,000  
Investment, Identifier [Axis]: NDC Acquisition Corp.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.22% [1],[2],[13],[14],[15] 0.22% [3],[4],[6],[9],[18]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[9],[18] $ 13,285,000  
Ending balance 13,558,000 [1],[2],[13],[14],[15] $ 13,285,000 [3],[4],[6],[9],[18]
Investment, Identifier [Axis]: NDC Acquisition Corp., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 3,083,000 3,425,000
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: NDT Global Holding, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[14],[19] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[14],[19] $ 769,000  
Investment, Identifier [Axis]: NDT Global Holding, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 347,000  
Fair Value (2,000)  
Investment, Identifier [Axis]: NDT Global Holding, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 173,000  
Fair Value (2,000)  
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[9]   1.17%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] 71,173,000  
Ending balance [3],[4],[5],[9]   $ 71,173,000
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[9]   0.24%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 14,758,000  
Ending balance [3],[4],[5],[9]   $ 14,758,000
Investment, Identifier [Axis]: NSI Parent, LP - Class A Common Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[13] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[13] $ 579,000  
Investment, Identifier [Axis]: Navigator Acquiror, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 3.68% [1],[2],[13],[14],[19] 3.54% [3],[4],[6],[9],[28]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[9],[28] $ 214,831,000  
Ending balance 231,097,000 [1],[2],[13],[14],[19] $ 214,831,000 [3],[4],[6],[9],[28]
Investment, Identifier [Axis]: Navigator Acquiror, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   8,249,000
Fair Value   $ 0
Investment, Identifier [Axis]: Navigator Acquiror, Inc., Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments 7,762,000  
Fair Value (58,000)  
Investment, Identifier [Axis]: Navigator Acquiror, Inc., Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments 7,762,000  
Fair Value $ 0  
Investment, Identifier [Axis]: Ncp Helix Holdings, LLC - Preferred Shares    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[13] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[13] $ 395,000  
Investment, Identifier [Axis]: Ncp Helix Holdings, LLC. - Preferred Shares    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[9]   0.01%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 537,000  
Ending balance [3],[4],[9]   $ 537,000
Investment, Identifier [Axis]: Nephele III, BV    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[14],[17] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[14],[17] $ 310,000  
Investment, Identifier [Axis]: Nephele III, BV, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 28,000  
Fair Value 0  
Investment, Identifier [Axis]: Neptune BidCo SAS    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[6],[7],[8],[9],[18]   0.11%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[7],[8],[9],[18] $ 6,525,000  
Ending balance [3],[4],[6],[7],[8],[9],[18]   $ 6,525,000
Investment, Identifier [Axis]: Neptune BidCo SAS, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   2,051,000
Fair Value   $ 0
Investment, Identifier [Axis]: Neptune BidCo, SAS    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[14],[17] 0.13%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[14],[17] $ 8,439,000  
Investment, Identifier [Axis]: Neptune BidCo, SAS, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 1,401,000  
Fair Value $ 0  
Investment, Identifier [Axis]: Neptune Holdings, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.11% [1],[2],[10],[13],[14] 0.11% [3],[4],[5],[6],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[9] $ 6,924,000  
Ending balance 6,872,000 [1],[2],[10],[13],[14] $ 6,924,000 [3],[4],[5],[6],[9]
Investment, Identifier [Axis]: Neptune Holdings, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 933,000 933,000
Fair Value 0 $ (23,000)
Investment, Identifier [Axis]: Netsmart Technologies Inc    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[9]   0.54%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[9] $ 32,611,000  
Ending balance [3],[4],[5],[6],[9]   $ 32,611,000
Investment, Identifier [Axis]: Netsmart Technologies Inc, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   4,345,000
Fair Value   (22,000)
Investment, Identifier [Axis]: Netsmart Technologies Inc, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   4,432,000
Fair Value   $ (22,000)
Investment, Identifier [Axis]: Netsmart Technologies, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13],[14] 0.53%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13],[14] $ 33,218,000  
Investment, Identifier [Axis]: Netsmart Technologies, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 4,345,000  
Fair Value (22,000)  
Investment, Identifier [Axis]: Netsmart Technologies, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 4,432,000  
Fair Value 0  
Investment, Identifier [Axis]: Nintex Topco Limited    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[7],[9],[18]   0.52%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[9],[18] $ 31,654,000  
Ending balance [3],[4],[7],[9],[18]   $ 31,654,000
Investment, Identifier [Axis]: Nintex Topco, Limited    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[13],[17] 0.49%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[13],[17] $ 30,953,000  
Investment, Identifier [Axis]: Noble Midco 3 Ltd    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[7],[8],[9]   0.28%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[7],[8],[9] $ 16,772,000  
Ending balance [3],[4],[5],[6],[7],[8],[9]   $ 16,772,000
Investment, Identifier [Axis]: Noble Midco 3 Ltd, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   3,875,000
Fair Value   (19,000)
Investment, Identifier [Axis]: Noble Midco 3 Ltd, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   2,583,000
Fair Value   0
Investment, Identifier [Axis]: Noble Midco 3, Ltd.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[11],[12],[13],[14] 0.27%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[11],[12],[13],[14] $ 16,966,000  
Investment, Identifier [Axis]: Noble Midco 3, Ltd., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 3,875,000  
Fair Value (19,000)  
Investment, Identifier [Axis]: Noble Midco 3, Ltd., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 2,390,000  
Fair Value 0  
Investment, Identifier [Axis]: North Haven Stallone Buyer, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   511,000
Fair Value   (1,000)
Investment, Identifier [Axis]: North Haven Stallone Buyer, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   913,000
Fair Value   $ (2,000)
Investment, Identifier [Axis]: North Haven Ushc Acquisition Inc 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[6],[8],[9],[16]   0.02%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[8],[9],[16] 1,432,000  
Ending balance [3],[4],[6],[8],[9],[16]   $ 1,432,000
Investment, Identifier [Axis]: North Haven Ushc Acquisition Inc 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[8],[9],[16]   0.04%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[8],[9],[16] 2,183,000  
Ending balance [3],[4],[8],[9],[16]   $ 2,183,000
Investment, Identifier [Axis]: North Haven Ushc Acquisition Inc 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[8],[9],[16]   0.02%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[8],[9],[16] 1,278,000  
Ending balance [3],[4],[8],[9],[16]   $ 1,278,000
Investment, Identifier [Axis]: North Haven Ushc Acquisition Inc 4    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[8],[9],[16]   0.01%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[8],[9],[16] 544,000  
Ending balance [3],[4],[8],[9],[16]   $ 544,000
Investment, Identifier [Axis]: North Haven Ushc Acquisition Inc 5    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[6],[8],[9],[16]   0.01%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[8],[9],[16] 751,000  
Ending balance [3],[4],[6],[8],[9],[16]   $ 751,000
Investment, Identifier [Axis]: North Haven Ushc Acquisition Inc 6    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[8],[9],[16]   0.01%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[8],[9],[16] 632,000  
Ending balance [3],[4],[8],[9],[16]   $ 632,000
Investment, Identifier [Axis]: North Haven Ushc Acquisition Inc 7    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[8],[9],[16]   0.06%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[8],[9],[16] $ 3,893,000  
Ending balance [3],[4],[8],[9],[16]   $ 3,893,000
Investment, Identifier [Axis]: North Haven Ushc Acquisition Inc, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   4,544,000
Fair Value   0
Investment, Identifier [Axis]: North Haven Ushc Acquisition Inc, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   1,548,000
Fair Value   $ 0
Investment, Identifier [Axis]: North Haven Ushc Acquisition, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[12],[13],[14],[15] 0.03%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[12],[13],[14],[15] $ 2,133,000  
Investment, Identifier [Axis]: North Haven Ushc Acquisition, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[12],[13],[15] 0.03%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[12],[13],[15] $ 2,149,000  
Investment, Identifier [Axis]: North Haven Ushc Acquisition, Inc. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[12],[13],[15] 0.02%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[12],[13],[15] $ 1,258,000  
Investment, Identifier [Axis]: North Haven Ushc Acquisition, Inc. 4    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[12],[13],[15] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[12],[13],[15] $ 535,000  
Investment, Identifier [Axis]: North Haven Ushc Acquisition, Inc. 5    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[12],[13],[14],[15] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[12],[13],[14],[15] $ 685,000  
Investment, Identifier [Axis]: North Haven Ushc Acquisition, Inc. 6    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[12],[13],[15] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[12],[13],[15] $ 623,000  
Investment, Identifier [Axis]: North Haven Ushc Acquisition, Inc. 7    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[12],[13],[15] 0.06%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[12],[13],[15] $ 3,834,000  
Investment, Identifier [Axis]: North Haven Ushc Acquisition, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 4,544,000  
Fair Value 0  
Investment, Identifier [Axis]: North Haven Ushc Acquisition, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 817,000  
Fair Value $ 0  
Investment, Identifier [Axis]: OHCP V TC COI, LP - LP Interest    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[13] 0.14%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[13] $ 8,645,000  
Investment, Identifier [Axis]: OHCP V TC COI, LP. - LP Interest    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[9]   0.13%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 8,085,000  
Ending balance [3],[4],[9]   $ 8,085,000
Investment, Identifier [Axis]: Octane Purchaser, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[12],[13],[14],[19] 0.04%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[12],[13],[14],[19] $ 2,318,000  
Investment, Identifier [Axis]: Octane Purchaser, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 1,227,000  
Fair Value 0  
Investment, Identifier [Axis]: Octane Purchaser, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 491,000  
Fair Value (2,000)  
Investment, Identifier [Axis]: Odevo AB 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[6],[7],[8],[9],[18]   0.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[7],[8],[9],[18] 258,000  
Ending balance [3],[4],[6],[7],[8],[9],[18]   $ 258,000
Investment, Identifier [Axis]: Odevo AB 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[7],[8],[9],[18]   0.05%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[8],[9],[18] 2,759,000  
Ending balance [3],[4],[7],[8],[9],[18]   $ 2,759,000
Investment, Identifier [Axis]: Odevo AB 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[7],[8],[9],[18]   0.13%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[8],[9],[18] 8,180,000  
Ending balance [3],[4],[7],[8],[9],[18]   $ 8,180,000
Investment, Identifier [Axis]: Odevo AB 4    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[6],[7],[8],[9],[18]   0.46%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[7],[8],[9],[18] $ 28,018,000  
Ending balance [3],[4],[6],[7],[8],[9],[18]   $ 28,018,000
Investment, Identifier [Axis]: Odevo AB, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   32,508,000
Fair Value   $ (80,000)
Investment, Identifier [Axis]: Odevo, AB 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[17] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[17] $ 295,000  
Investment, Identifier [Axis]: Odevo, AB 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[17] 0.05%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[17] $ 3,040,000  
Investment, Identifier [Axis]: Odevo, AB 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[17] 0.15%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[17] $ 9,614,000  
Investment, Identifier [Axis]: Odevo, AB 4    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[17] 0.45%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[17] $ 28,239,000  
Investment, Identifier [Axis]: Odevo, AB 5    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[14],[17] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[14],[17] $ 631,000  
Investment, Identifier [Axis]: Odevo, AB 6    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[17] 0.03%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[17] $ 1,694,000  
Investment, Identifier [Axis]: Odevo, AB, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 30,152,000  
Fair Value $ 0  
Investment, Identifier [Axis]: Onex Baltimore Buyer, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.17% [1],[2],[10],[13],[24] 0.18% [3],[4],[9],[16],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[16],[26] $ 10,804,000  
Ending balance $ 10,804,000 [1],[2],[10],[13],[24] $ 10,804,000 [3],[4],[9],[16],[26]
Investment, Identifier [Axis]: Onex Baltimore Buyer, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.23% [1],[2],[13],[14],[15],[24] 0.24% [3],[4],[6],[16],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[16],[26] $ 14,746,000  
Ending balance 14,667,000 [1],[2],[13],[14],[15],[24] $ 14,746,000 [3],[4],[6],[16],[26]
Investment, Identifier [Axis]: Onex Baltimore Buyer, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 4,472,000 4,472,000
Fair Value 0 $ 0
Investment, Identifier [Axis]: Optimizely North America Inc 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[8],[9]   0.02%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] 1,072,000  
Ending balance [3],[4],[5],[8],[9]   $ 1,072,000
Investment, Identifier [Axis]: Optimizely North America Inc 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[8],[9]   0.05%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] 2,956,000  
Ending balance [3],[4],[5],[8],[9]   $ 2,956,000
Investment, Identifier [Axis]: Optimizely North America Inc 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[8],[9]   0.13%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 8,120,000  
Ending balance [3],[4],[5],[6],[8],[9]   $ 8,120,000
Investment, Identifier [Axis]: Optimizely North America Inc, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   1,218,000
Fair Value   $ (12,000)
Investment, Identifier [Axis]: Optimizely North America, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13] 0.02%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13] $ 1,169,000  
Investment, Identifier [Axis]: Optimizely North America, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13] 0.05%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13] $ 3,344,000  
Investment, Identifier [Axis]: Optimizely North America, Inc. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.13%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 8,079,000  
Investment, Identifier [Axis]: Optimizely North America, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,218,000  
Fair Value (12,000)  
Investment, Identifier [Axis]: Oranje Holdco Inc 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[6],[8],[9],[16]   0.03%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[8],[9],[16] 2,000,000  
Ending balance [3],[4],[6],[8],[9],[16]   $ 2,000,000
Investment, Identifier [Axis]: Oranje Holdco Inc 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[9]   0.56%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 33,969,000  
Ending balance [3],[4],[9]   $ 33,969,000
Investment, Identifier [Axis]: Oranje Holdco Inc, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   250,000
Fair Value   $ 0
Investment, Identifier [Axis]: Oranje Holdco, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[12],[13],[14],[15] 0.03%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[12],[13],[14],[15] $ 2,000,000  
Investment, Identifier [Axis]: Oranje Holdco, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[13],[15] 0.54%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[13],[15] $ 33,969,000  
Investment, Identifier [Axis]: Oranje Holdco, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 250,000  
Fair Value $ 0  
Investment, Identifier [Axis]: Other Cash and Cash Equivalents    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 4.02% [1],[2] 3.25% [3],[4]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4] $ 197,359,000  
Ending balance 252,797,000 [1],[2] $ 197,359,000 [3],[4]
Investment, Identifier [Axis]: Oxford Global Resources Inc 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[6],[9],[16]   0.31%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[9],[16] 18,774,000  
Ending balance [3],[4],[6],[9],[16]   $ 18,774,000
Investment, Identifier [Axis]: Oxford Global Resources Inc 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[9],[16]   0.05%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[16] 2,909,000  
Ending balance [3],[4],[9],[16]   $ 2,909,000
Investment, Identifier [Axis]: Oxford Global Resources Inc 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[9],[28]   0.04%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[28] $ 2,217,000  
Ending balance [3],[4],[9],[28]   $ 2,217,000
Investment, Identifier [Axis]: Oxford Global Resources Inc, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   3,085,000
Fair Value   $ 0
Investment, Identifier [Axis]: Oxford Global Resources, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[13],[15] 0.30%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[13],[15] $ 18,677,000  
Investment, Identifier [Axis]: Oxford Global Resources, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[13],[14],[15] 0.05%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[13],[14],[15] $ 2,894,000  
Investment, Identifier [Axis]: Oxford Global Resources, Inc. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[13],[19] 0.04%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[13],[19] $ 2,205,000  
Investment, Identifier [Axis]: Oxford Global Resources, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 3,085,000  
Fair Value 0  
Investment, Identifier [Axis]: PDI TA Holdings, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[9]   0.69%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[9] $ 41,760,000  
Ending balance [3],[4],[5],[6],[9]   $ 41,760,000
Investment, Identifier [Axis]: PDI TA Holdings, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13] 0.70%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13] $ 43,735,000  
Investment, Identifier [Axis]: PDI TA Holdings, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.09%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 5,355,000  
Investment, Identifier [Axis]: PDI TA Holdings, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   3,835,000
Fair Value   0
Investment, Identifier [Axis]: PDI TA Holdings, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 2,280,000 3,800,000
Fair Value $ 0 $ (29,000)
Investment, Identifier [Axis]: PKF O'Connor Davies Advisory, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.02% [1],[2],[10],[12],[13],[14] 0.02% [3],[4],[5],[6],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 1,034,000  
Ending balance 1,037,000 [1],[2],[10],[12],[13],[14] $ 1,034,000 [3],[4],[5],[6],[8],[9]
Investment, Identifier [Axis]: PKF O'Connor Davies Advisory, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 504,000 504,000
Fair Value (3,000) 0
Investment, Identifier [Axis]: PKF O'Connor Davies Advisory, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 141,000 141,000
Fair Value $ (1,000) $ (1,000)
Investment, Identifier [Axis]: PPT Holdings III, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.03% [1],[2],[12],[13],[17] 0.03% [3],[4],[8],[9],[18]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[8],[9],[18] $ 1,767,000  
Ending balance $ 1,882,000 [1],[2],[12],[13],[17] $ 1,767,000 [3],[4],[8],[9],[18]
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.03% [1],[2],[10],[13] 0.03% [3],[4],[5],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] $ 1,977,000  
Ending balance $ 1,967,000 [1],[2],[10],[13] $ 1,977,000 [3],[4],[5],[8],[9]
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [1],[2],[10],[12],[13],[14] 0.00% [3],[4],[5],[6],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 76,000  
Ending balance 198,000 [1],[2],[10],[12],[13],[14] $ 76,000 [3],[4],[5],[6],[8],[9]
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 187,000 309,000
Fair Value 0 (2,000)
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 159,000 159,000
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: PT Intermediate Holdings III, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.98% [1],[2],[10],[13],[14] 1.01% [3],[4],[6],[9],[28]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[9],[28] $ 61,437,000  
Ending balance 61,669,000 [1],[2],[10],[13],[14] $ 61,437,000 [3],[4],[6],[9],[28]
Investment, Identifier [Axis]: PT Intermediate Holdings III, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 4,338,000 4,338,000
Fair Value 0 $ (5,000)
Investment, Identifier [Axis]: Paisley Bidco Ltd 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[6],[7],[8],[9],[18]   0.11%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[7],[8],[9],[18] 6,438,000  
Ending balance [3],[4],[6],[7],[8],[9],[18]   $ 6,438,000
Investment, Identifier [Axis]: Paisley Bidco Ltd 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[7],[8],[9],[18]   0.06%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[8],[9],[18] 3,507,000  
Ending balance [3],[4],[7],[8],[9],[18]   $ 3,507,000
Investment, Identifier [Axis]: Paisley Bidco Ltd 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[7],[8],[9],[18]   0.05%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[8],[9],[18] $ 3,093,000  
Ending balance [3],[4],[7],[8],[9],[18]   $ 3,093,000
Investment, Identifier [Axis]: Paisley Bidco Ltd, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   1,563,000
Fair Value   $ (12,000)
Investment, Identifier [Axis]: Paisley Bidco, Ltd. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[17] 0.14%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[17] $ 8,853,000  
Investment, Identifier [Axis]: Paisley Bidco, Ltd. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[17] 0.06%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[17] $ 4,028,000  
Investment, Identifier [Axis]: Paisley Bidco, Ltd. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[17] 0.06%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[17] $ 3,553,000  
Investment, Identifier [Axis]: Paramount Global Surfaces, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[13],[15] 0.68%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[13],[15] $ 43,011,000  
Investment, Identifier [Axis]: Park Place Technologies, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 1.79% [1],[2],[10],[13] 1.86% [3],[4],[5],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 112,936,000  
Ending balance $ 112,650,000 [1],[2],[10],[13] $ 112,936,000 [3],[4],[5],[9]
Investment, Identifier [Axis]: Park Place Technologies, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.06% [1],[2],[10],[12],[13],[14] 0.06% [3],[4],[5],[6],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 3,698,000  
Ending balance $ 3,909,000 [1],[2],[10],[12],[13],[14] $ 3,698,000 [3],[4],[5],[6],[8],[9]
Investment, Identifier [Axis]: Park Place Technologies, LLC 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.15%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 9,220,000  
Investment, Identifier [Axis]: Park Place Technologies, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 8,502,000 17,767,000
Fair Value 0 (89,000)
Investment, Identifier [Axis]: Park Place Technologies, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 9,417,000 9,505,000
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Patriot Growth Insurance Services, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13] 0.07%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13] $ 4,521,000  
Investment, Identifier [Axis]: Patriot Growth Insurance Services, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.06%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 3,554,000  
Investment, Identifier [Axis]: Patriot Growth Insurance Services, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 679,000  
Fair Value 0  
Investment, Identifier [Axis]: Patriot Growth Insurance Services, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 469,000  
Fair Value (9,000)  
Investment, Identifier [Axis]: Patriot Growth Insurance Services, LLC. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[8],[9]   0.07%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] 4,544,000  
Ending balance [3],[4],[5],[8],[9]   $ 4,544,000
Investment, Identifier [Axis]: Patriot Growth Insurance Services, LLC. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[8],[9]   0.05%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] 2,979,000  
Ending balance [3],[4],[5],[6],[8],[9]   $ 2,979,000
Investment, Identifier [Axis]: Patriot Growth Insurance Services, LLC. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[8]   0.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8] $ 225,000  
Ending balance [3],[4],[5],[6],[8]   $ 225,000
Investment, Identifier [Axis]: Patriot Growth Insurance Services, LLC., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   1,275,000
Fair Value   0
Investment, Identifier [Axis]: Patriot Growth Insurance Services, LLC., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   235,000
Fair Value   $ 0
Investment, Identifier [Axis]: Pavion Corp. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 1.17% [1],[2],[10],[11],[13] 1.26% [3],[4],[5],[7],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[7],[9] $ 76,409,000  
Ending balance $ 73,426,000 [1],[2],[10],[11],[13] $ 76,409,000 [3],[4],[5],[7],[9]
Investment, Identifier [Axis]: Pavion Corp. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.25% [1],[2],[10],[11],[13],[14] 0.26% [3],[4],[5],[6],[7],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[7],[9] $ 15,497,000  
Ending balance 15,511,000 [1],[2],[10],[11],[13],[14] $ 15,497,000 [3],[4],[5],[6],[7],[9]
Investment, Identifier [Axis]: Pavion Corp., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 2,559,000 2,559,000
Fair Value 0 $ 0
Investment, Identifier [Axis]: Petrus Buyer Inc 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[9],[10],[12]   0.03%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[10],[12] 1,871,000  
Ending balance [3],[4],[9],[10],[12]   $ 1,871,000
Investment, Identifier [Axis]: Petrus Buyer Inc 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[8],[9]   0.01%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 335,000  
Ending balance [3],[4],[5],[6],[8],[9]   $ 335,000
Investment, Identifier [Axis]: Petrus Buyer Inc, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   260,000
Fair Value   0
Investment, Identifier [Axis]: Petrus Buyer Inc, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   272,000
Fair Value   $ 0
Investment, Identifier [Axis]: Petrus Buyer, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13] 0.03%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13] $ 1,862,000  
Investment, Identifier [Axis]: Petrus Buyer, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 333,000  
Investment, Identifier [Axis]: Petrus Buyer, Inc. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13] $ 645,000  
Investment, Identifier [Axis]: Petrus Buyer, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 260,000  
Fair Value 0  
Investment, Identifier [Axis]: Petrus Buyer, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 272,000  
Fair Value $ 0  
Investment, Identifier [Axis]: Phoenix 1 Buyer Corp.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.41% [1],[2],[10],[13],[14] 0.42% [3],[4],[5],[6],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[9] $ 25,753,000  
Ending balance 25,559,000 [1],[2],[10],[13],[14] $ 25,753,000 [3],[4],[5],[6],[9]
Investment, Identifier [Axis]: Phoenix 1 Buyer Corp., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 5,009,000 5,009,000
Fair Value 0 $ 0
Investment, Identifier [Axis]: Ping Identity Holding Corp    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[8],[9]   0.11%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 6,691,000  
Ending balance [3],[4],[5],[6],[8],[9]   $ 6,691,000
Investment, Identifier [Axis]: Ping Identity Holding Corp, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   671,000
Fair Value   $ 0
Investment, Identifier [Axis]: Ping Identity Holding Corp.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.11%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 6,657,000  
Investment, Identifier [Axis]: Ping Identity Holding Corp., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 671,000  
Fair Value 0  
Investment, Identifier [Axis]: Point Broadband Acquisition, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[6],[9],[16]   2.04%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[9],[16] $ 123,684,000  
Ending balance [3],[4],[6],[9],[16]   $ 123,684,000
Investment, Identifier [Axis]: Point Broadband Acquisition, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[13],[14],[15] 1.99%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[13],[14],[15] $ 125,381,000  
Investment, Identifier [Axis]: Point Broadband Acquisition, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 36,397,000 36,397,000
Fair Value $ 0 $ (455,000)
Investment, Identifier [Axis]: Point Broadband Holdings, LLC - Class A Common Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.11% [1],[2],[13] 0.11% [3],[4],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 6,483,000  
Ending balance $ 7,211,000 [1],[2],[13] $ 6,483,000 [3],[4],[9]
Investment, Identifier [Axis]: Point Broadband Holdings, LLC - Class Additional A Common Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.02% [1],[2],[13] 0.02% [3],[4],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 1,393,000  
Ending balance $ 1,550,000 [1],[2],[13] $ 1,393,000 [3],[4],[9]
Investment, Identifier [Axis]: Point Broadband Holdings, LLC - Class Additional B Common Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [1],[2],[13] 0.09% [3],[4],[7],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[9] $ 5,287,000  
Ending balance 287,000 [1],[2],[13] $ 5,287,000 [3],[4],[7],[9]
Investment, Identifier [Axis]: Point Broadband Holdings, LLC - Class Additional B Common Units 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[9]   0.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 243,000  
Ending balance [3],[4],[9]   $ 243,000
Investment, Identifier [Axis]: Point Broadband Holdings, LLC - Class B Common Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.02% [1],[2],[13] 0.02% [3],[4],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 1,130,000  
Ending balance 1,337,000 [1],[2],[13] $ 1,130,000 [3],[4],[9]
Investment, Identifier [Axis]: Porcelain Acquisition Corp.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[9],[16]   0.83%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[16] $ 50,531,000  
Ending balance [3],[4],[9],[16]   $ 50,531,000
Investment, Identifier [Axis]: Profile Products, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.11% [1],[2],[10],[13] 0.12% [3],[4],[5],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 7,001,000  
Ending balance $ 7,055,000 [1],[2],[10],[13] $ 7,001,000 [3],[4],[5],[9]
Investment, Identifier [Axis]: Profile Products, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [1],[2],[10],[12],[13],[14] 0.00% [3],[4],[5],[6],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 88,000  
Ending balance 292,000 [1],[2],[10],[12],[13],[14] $ 88,000 [3],[4],[5],[6],[8],[9]
Investment, Identifier [Axis]: Profile Products, LLC 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[8],[9]   0.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] 9,000  
Ending balance [3],[4],[5],[6],[8],[9]   $ 9,000
Investment, Identifier [Axis]: Profile Products, LLC, Revolver 1    
Schedule of Investments [Line Items]    
Unfunded commitments 373,000 353,000
Fair Value (7,000) 0
Investment, Identifier [Axis]: Profile Products, LLC, Revolver 2    
Schedule of Investments [Line Items]    
Unfunded commitments 213,000 417,000
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Progress Residential PM Holdings, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 1.08% [1],[2],[10],[13] 1.12% [3],[4],[5],[6],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[9] $ 67,900,000  
Ending balance $ 67,900,000 [1],[2],[10],[13] $ 67,900,000 [3],[4],[5],[6],[9]
Investment, Identifier [Axis]: Progress Residential PM Holdings, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.01% [1],[2],[10],[12],[13],[14] 0.01% [3],[4],[5],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] $ 833,000  
Ending balance 833,000 [1],[2],[10],[12],[13],[14] $ 833,000 [3],[4],[5],[8],[9]
Investment, Identifier [Axis]: Progress Residential PM Holdings, LLC, Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments 16,623,000 16,623,000
Fair Value 0 0
Investment, Identifier [Axis]: Progress Residential PM Holdings, LLC, Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments 333,000 333,000
Fair Value 0 $ 0
Investment, Identifier [Axis]: Project Ruby Ultimate Parent Corp    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[8],[9]   0.02%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] 995,000  
Ending balance [3],[4],[5],[8],[9]   $ 995,000
Investment, Identifier [Axis]: Project Ruby Ultimate Parent Corp 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[18]   0.14%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[18] $ 8,360,000  
Ending balance [3],[4],[18]   $ 8,360,000
Investment, Identifier [Axis]: Project Ruby Ultimate Parent Corp.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[17] 0.13%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[17] $ 8,288,000  
Investment, Identifier [Axis]: Project Ruby Ultimate Parent Corp.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13] 0.02%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13] $ 998,000  
Investment, Identifier [Axis]: Pye-Barker Fire & Safety, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [10] 0.07% [1],[2],[13] 0.07% [3],[4],[5],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9],[10] $ 4,461,000  
Ending balance [10] $ 4,461,000 [1],[2],[13] $ 4,461,000 [3],[4],[5],[8],[9]
Investment, Identifier [Axis]: Pye-Barker Fire & Safety, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [10] 0.22% [1],[2],[12],[13] 0.23% [3],[4],[5],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9],[10] $ 13,747,000  
Ending balance [10] 13,816,000 [1],[2],[12],[13] $ 13,747,000 [3],[4],[5],[8],[9]
Investment, Identifier [Axis]: QBS Parent Inc    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[8],[9]   0.15%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 9,267,000  
Ending balance [3],[4],[5],[6],[8],[9]   $ 9,267,000
Investment, Identifier [Axis]: QBS Parent Inc, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   984,000
Fair Value   $ (5,000)
Investment, Identifier [Axis]: QBS Parent, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.21%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 13,402,000  
Investment, Identifier [Axis]: QBS Parent, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 3,472,000  
Fair Value 0  
Investment, Identifier [Axis]: QBS Parent, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,908,000  
Fair Value $ (10,000)  
Investment, Identifier [Axis]: Qualus Power Services Corp 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[13],[15] 0.52%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[13],[15] $ 32,591,000  
Investment, Identifier [Axis]: Qualus Power Services Corp 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[13],[15] 0.56%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[13],[15] $ 35,256,000  
Investment, Identifier [Axis]: Qualus Power Services Corp 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[13],[14],[15] 1.12%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[13],[14],[15] $ 70,579,000  
Investment, Identifier [Axis]: Qualus Power Services Corp. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[9],[16]   0.54%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[16] 32,778,000  
Ending balance [3],[4],[9],[16]   $ 32,778,000
Investment, Identifier [Axis]: Qualus Power Services Corp. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[9],[16]   0.58%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[16] 35,439,000  
Ending balance [3],[4],[9],[16]   $ 35,439,000
Investment, Identifier [Axis]: Qualus Power Services Corp. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[6],[9],[16]   1.17%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[9],[16] 70,813,000  
Ending balance [3],[4],[6],[9],[16]   $ 70,813,000
Investment, Identifier [Axis]: Qualus Power Services Corp., Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments 12,093,000 12,093,000
Fair Value 0 0
Investment, Identifier [Axis]: Qualus Power Services Corp., Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments 33,748,000 33,748,000
Fair Value $ (169,000) $ (169,000)
Investment, Identifier [Axis]: R1 Holdings, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[12],[13],[14],[15] 0.02%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[12],[13],[14],[15] $ 1,278,000  
Investment, Identifier [Axis]: R1 Holdings, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 31,000  
Fair Value $ 0  
Investment, Identifier [Axis]: RC VI Buckeye Holdings, LLC - LLC Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[13] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[13] $ 161,000  
Investment, Identifier [Axis]: RFS Opco, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.19% [1],[2],[13],[14],[19] 0.16% [3],[4],[6],[8],[9],[28]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[8],[9],[28] $ 9,491,000  
Ending balance 11,823,000 [1],[2],[13],[14],[19] $ 9,491,000 [3],[4],[6],[8],[9],[28]
Investment, Identifier [Axis]: RFS Opco, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 1,881,000 2,381,000
Fair Value $ (5,000) $ 0
Investment, Identifier [Axis]: RWL Holdings, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.42% [1],[2],[10],[13] 0.44% [3],[4],[5],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 26,714,000  
Ending balance $ 26,577,000 [1],[2],[10],[13] $ 26,714,000 [3],[4],[5],[9]
Investment, Identifier [Axis]: RailPros Parent, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 397,000  
Investment, Identifier [Axis]: RailPros Parent, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 124,000  
Fair Value (1,000)  
Investment, Identifier [Axis]: RailPros Parent, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 62,000  
Fair Value $ 0  
Investment, Identifier [Axis]: Rally Buyer, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.01% [1],[2],[10],[12],[13] 0.01% [3],[4],[5],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] $ 820,000  
Ending balance $ 816,000 [1],[2],[10],[12],[13] $ 820,000 [3],[4],[5],[8],[9]
Investment, Identifier [Axis]: Rally Buyer, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [1],[2],[10],[12],[13] 0.00% [3],[4],[5],[6],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 77,000  
Ending balance $ 101,000 [1],[2],[10],[12],[13] $ 77,000 [3],[4],[5],[6],[8],[9]
Investment, Identifier [Axis]: Rally Buyer, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   25,000
Fair Value   $ 0
Investment, Identifier [Axis]: Razor Holdco, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.30% [1],[2],[10],[13] 0.60% [3],[4],[5],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 36,593,000  
Ending balance 18,885,000 [1],[2],[10],[13] $ 36,593,000 [3],[4],[5],[9]
Investment, Identifier [Axis]: Red Fox CD Acquisition Corp    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[9],[16]   1.28%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[16] $ 78,073,000  
Ending balance [3],[4],[9],[16]   $ 78,073,000
Investment, Identifier [Axis]: Red Fox CD Acquisition Corp. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[13],[15] 1.17%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[13],[15] $ 73,640,000  
Investment, Identifier [Axis]: Red Fox CD Acquisition Corp. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[12],[13],[14],[15] 0.10%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[12],[13],[14],[15] $ 5,984,000  
Investment, Identifier [Axis]: Red Fox CD Acquisition Corp., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 21,879,000  
Fair Value $ 0  
Investment, Identifier [Axis]: Red Griffin ParentCo, LLC - Class A Common Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.05% [1],[2],[13] 0.05% [3],[4],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 3,166,000  
Ending balance $ 2,844,000 [1],[2],[13] $ 3,166,000 [3],[4],[9]
Investment, Identifier [Axis]: Red River Technology, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 1.12% [1],[2],[13],[15] 1.24% [3],[4],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[16] $ 75,588,000  
Ending balance $ 70,276,000 [1],[2],[13],[15] $ 75,588,000 [3],[4],[9],[16]
Investment, Identifier [Axis]: Redwood Services Group, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 1.22% [1],[2],[10],[13] 0.08% [3],[4],[5],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] $ 4,641,000  
Ending balance $ 76,766,000 [1],[2],[10],[13] $ 4,641,000 [3],[4],[5],[8],[9]
Investment, Identifier [Axis]: Redwood Services Group, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 1.32% [1],[2],[10],[13],[14] 1.22% [3],[4],[5],[6],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 73,918,000  
Ending balance 82,844,000 [1],[2],[10],[13],[14] $ 73,918,000 [3],[4],[5],[6],[8],[9]
Investment, Identifier [Axis]: Redwood Services Group, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   3,980,000
Fair Value   $ 0
Investment, Identifier [Axis]: Redwood Services Group, LLC, Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments 3,929,000  
Fair Value 0  
Investment, Identifier [Axis]: Redwood Services Group, LLC, Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments 16,680,000  
Fair Value $ 0  
Investment, Identifier [Axis]: Relativity ODA, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.30% [1],[2],[13],[14],[15] 0.32% [3],[4],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[16] $ 19,251,000  
Ending balance 19,171,000 [1],[2],[13],[14],[15] $ 19,251,000 [3],[4],[9],[16]
Investment, Identifier [Axis]: Relativity ODA, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 2,966,000 2,966,000
Fair Value (74,000) $ (74,000)
Investment, Identifier [Axis]: RoadOne Inc    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[6],[8],[9],[16]   0.02%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[8],[9],[16] $ 1,109,000  
Ending balance [3],[4],[6],[8],[9],[16]   $ 1,109,000
Investment, Identifier [Axis]: RoadOne Inc, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   226,000
Fair Value   $ 0
Investment, Identifier [Axis]: Roadsafe Holdings, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.50% [1],[2],[13],[15] 0.53% [3],[4],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[16] $ 32,093,000  
Ending balance $ 31,429,000 [1],[2],[13],[15] $ 32,093,000 [3],[4],[9],[16]
Investment, Identifier [Axis]: Roadsafe Holdings, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.31% [1],[2],[13],[15] 0.33% [3],[4],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[16] $ 19,770,000  
Ending balance $ 19,364,000 [1],[2],[13],[15] $ 19,770,000 [3],[4],[9],[16]
Investment, Identifier [Axis]: Roadsafe Holdings, Inc. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.06% [1],[2],[13],[15] 0.07% [3],[4],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[16] $ 4,032,000  
Ending balance $ 3,949,000 [1],[2],[13],[15] $ 4,032,000 [3],[4],[9],[16]
Investment, Identifier [Axis]: Roadsafe Holdings, Inc. 4    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.02% [1],[2],[12],[13],[15] 0.02% [3],[4],[8],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[8],[9],[16] $ 1,198,000  
Ending balance 1,173,000 [1],[2],[12],[13],[15] $ 1,198,000 [3],[4],[8],[9],[16]
Investment, Identifier [Axis]: Rocky MRA Acquisition Corp    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[8],[9],[28]   0.15%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[8],[9],[28] $ 9,253,000  
Ending balance [3],[4],[8],[9],[28]   $ 9,253,000
Investment, Identifier [Axis]: Rocky MRA Acquisition Corp.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[13],[19] 0.15%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[13],[19] $ 9,426,000  
Investment, Identifier [Axis]: SEKO Global Logistics Network, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.03% [1],[2],[12],[13],[15] 0.00% [3],[4],[6],[8],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[8],[9],[16] $ 124,000  
Ending balance $ 1,983,000 [1],[2],[12],[13],[15] $ 124,000 [3],[4],[6],[8],[9],[16]
Investment, Identifier [Axis]: SEKO Global Logistics Network, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.01% [1],[2],[12],[13],[15] 0.00% [3],[4],[8],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[8],[9],[16] $ 78,000  
Ending balance 649,000 [1],[2],[12],[13],[15] $ 78,000 [3],[4],[8],[9],[16]
Investment, Identifier [Axis]: SEKO Global Logistics Network, LLC 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[8],[9],[16]   0.03%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[8],[9],[16] 1,958,000  
Ending balance [3],[4],[8],[9],[16]   $ 1,958,000
Investment, Identifier [Axis]: SEKO Global Logistics Network, LLC 4    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[8],[9],[16]   0.01%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[8],[9],[16] $ 413,000  
Ending balance [3],[4],[8],[9],[16]   $ 413,000
Investment, Identifier [Axis]: SEKO Global Logistics Network, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   15,000
Fair Value   $ 0
Investment, Identifier [Axis]: SG Acquisition, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 2.08% [1],[2],[10],[13],[14] 2.18% [3],[4],[5],[6],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[9] $ 132,471,000  
Ending balance 130,811,000 [1],[2],[10],[13],[14] $ 132,471,000 [3],[4],[5],[6],[9]
Investment, Identifier [Axis]: SG Acquisition, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 8,301,000 8,301,000
Fair Value 0 $ 0
Investment, Identifier [Axis]: SQ ABS Issuer LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[7],[8],[9],[18]   0.10%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[8],[9],[18] 6,031,000  
Ending balance [3],[4],[7],[8],[9],[18]   $ 6,031,000
Investment, Identifier [Axis]: SQ ABS Issuer LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[7],[8],[9],[18]   0.07%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[8],[9],[18] $ 3,995,000  
Ending balance [3],[4],[7],[8],[9],[18]   $ 3,995,000
Investment, Identifier [Axis]: SQ ABS Issuer, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[17] 0.09%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[17] $ 5,362,000  
Investment, Identifier [Axis]: SQ ABS Issuer, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[17] 0.06%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[17] $ 3,584,000  
Investment, Identifier [Axis]: STV Group, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13],[14] 0.38%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13],[14] $ 24,042,000  
Investment, Identifier [Axis]: STV Group, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[9]   0.40%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] 24,234,000  
Ending balance [3],[4],[5],[9]   $ 24,234,000
Investment, Identifier [Axis]: STV Group, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[8],[9]   0.01%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] 628,000  
Ending balance [3],[4],[5],[6],[8],[9]   $ 628,000
Investment, Identifier [Axis]: STV Group, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 6,976,000 6,976,000
Fair Value (70,000) (70,000)
Investment, Identifier [Axis]: STV Group, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 4,883,000 4,186,000
Fair Value 0 $ 0
Investment, Identifier [Axis]: Safety Borrower Holdings LP 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[8],[9],[16]   0.09%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[8],[9],[16] 5,256,000  
Ending balance [3],[4],[8],[9],[16]   $ 5,256,000
Investment, Identifier [Axis]: Safety Borrower Holdings LP 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[6],[8],[9],[16]   0.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[8],[9],[16] $ 89,000  
Ending balance [3],[4],[6],[8],[9],[16]   $ 89,000
Investment, Identifier [Axis]: Safety Borrower Holdings LP, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   280,000
Fair Value   $ 0
Investment, Identifier [Axis]: Safety Borrower Holdings, LP 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[13],[15] 0.08%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[13],[15] $ 5,230,000  
Investment, Identifier [Axis]: Safety Borrower Holdings, LP 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[12],[13],[14],[15] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[12],[13],[14],[15] $ 136,000  
Investment, Identifier [Axis]: Safety Borrower Holdings, LP, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 233,000  
Fair Value $ 0  
Investment, Identifier [Axis]: Sam Holding Co, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.58% [1],[2],[13],[15] 0.61% [3],[4],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[16] $ 36,764,000  
Ending balance $ 36,575,000 [1],[2],[13],[15] $ 36,764,000 [3],[4],[9],[16]
Investment, Identifier [Axis]: Sam Holding Co, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.25% [1],[2],[13],[15] 0.26% [3],[4],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[16] $ 15,798,000  
Ending balance $ 15,720,000 [1],[2],[13],[15] $ 15,798,000 [3],[4],[9],[16]
Investment, Identifier [Axis]: Sam Holding Co, Inc. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.18% [1],[2],[13],[15] 0.19% [3],[4],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[16] $ 11,406,000  
Ending balance $ 11,353,000 [1],[2],[13],[15] $ 11,406,000 [3],[4],[9],[16]
Investment, Identifier [Axis]: Sam Holding Co, Inc. 4    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.16% [1],[2],[13],[15] 0.16% [3],[4],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[16] $ 9,951,000  
Ending balance $ 9,921,000 [1],[2],[13],[15] $ 9,951,000 [3],[4],[9],[16]
Investment, Identifier [Axis]: Sam Holding Co, Inc. 5    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.04% [1],[2],[12],[13],[14],[15] 0.03% [3],[4],[6],[8],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[8],[9],[16] $ 1,800,000  
Ending balance $ 2,600,000 [1],[2],[12],[13],[14],[15] $ 1,800,000 [3],[4],[6],[8],[9],[16]
Investment, Identifier [Axis]: Sam Holding Co, Inc. 6    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.16% [1],[2],[12],[13],[14],[15] 0.10% [3],[4],[6],[8],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[8],[9],[16] $ 5,980,000  
Ending balance 9,845,000 [1],[2],[12],[13],[14],[15] $ 5,980,000 [3],[4],[6],[8],[9],[16]
Investment, Identifier [Axis]: Sam Holding Co, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 2,000,000 5,900,000
Fair Value 0 0
Investment, Identifier [Axis]: Sam Holding Co, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 3,400,000 4,200,000
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Scorpio BidCo SAS    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.43% [1],[2],[11],[12],[13],[14],[17] 0.38% [3],[4],[6],[7],[8],[9],[18]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[7],[8],[9],[18] $ 23,362,000  
Ending balance 26,836,000 [1],[2],[11],[12],[13],[14],[17] $ 23,362,000 [3],[4],[6],[7],[8],[9],[18]
Investment, Identifier [Axis]: Scorpio BidCo SAS, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 4,386,000 4,386,000
Fair Value $ 0 $ (46,000)
Investment, Identifier [Axis]: Seahawk Bidco, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.71% [1],[2],[13],[14],[15] 0.66% [3],[4],[6],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[9],[16] $ 39,844,000  
Ending balance 44,850,000 [1],[2],[13],[14],[15] $ 39,844,000 [3],[4],[6],[9],[16]
Investment, Identifier [Axis]: Seahawk Bidco, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 7,288,000 12,511,000
Fair Value 0 0
Investment, Identifier [Axis]: Seahawk Bidco, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 3,753,000 3,753,000
Fair Value (34,000) $ (34,000)
Investment, Identifier [Axis]: SelectQuote Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[7],[8],[9],[31]   0.90%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[8],[9],[31] $ 54,837,000  
Ending balance [3],[4],[7],[8],[9],[31]   $ 54,837,000
Investment, Identifier [Axis]: SelectQuote Inc. - Warrants    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [1],[2],[11],[13] 0.01% [3],[4],[7],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[9] $ 441,000  
Ending balance $ 144,000 [1],[2],[11],[13] $ 441,000 [3],[4],[7],[9]
Investment, Identifier [Axis]: SelectQuote, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[32] 0.52%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[32] $ 32,539,000  
Investment, Identifier [Axis]: Shelf Bidco Ltd    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[7],[9],[26]   2.45%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[7],[9],[26] $ 149,131,000  
Ending balance [3],[4],[5],[7],[9],[26]   $ 149,131,000
Investment, Identifier [Axis]: Shelf Bidco, Ltd.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[11],[13],[24] 2.37%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[11],[13],[24] $ 149,131,000  
Investment, Identifier [Axis]: Shelf Holdco Ltd - Common Equity    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [1],[2],[11],[13] 0.00% [3],[4],[7],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[9] $ 188,000  
Ending balance 190,000 [1],[2],[11],[13] $ 188,000 [3],[4],[7],[9]
Investment, Identifier [Axis]: Simplicity Financial Marketing Group Holdings Inc    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[7],[8],[9]   0.13%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[7],[8],[9] $ 7,965,000  
Ending balance [3],[4],[5],[6],[7],[8],[9]   $ 7,965,000
Investment, Identifier [Axis]: Simplicity Financial Marketing Group Holdings Inc, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   2,151,000
Fair Value   (11,000)
Investment, Identifier [Axis]: Simplicity Financial Marketing Group Holdings Inc, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   1,076,000
Fair Value   (11,000)
Investment, Identifier [Axis]: Simplicity Financial Marketing Group Holdings, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[11],[12],[13],[14] 0.13%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[11],[12],[13],[14] $ 8,462,000  
Investment, Identifier [Axis]: Simplicity Financial Marketing Group Holdings, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 1,673,000  
Fair Value 0  
Investment, Identifier [Axis]: Simplicity Financial Marketing Group Holdings, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,076,000  
Fair Value (11,000)  
Investment, Identifier [Axis]: Skopima Consilio Parent LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   4,200,000
Fair Value   $ (12,000)
Investment, Identifier [Axis]: Skopima Consilio Parent, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 4,200,000  
Fair Value $ (84,000)  
Investment, Identifier [Axis]: Smile Doctors, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.16% [1],[2],[10],[13] 0.17% [3],[4],[5],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 10,533,000  
Ending balance $ 10,372,000 [1],[2],[10],[13] $ 10,533,000 [3],[4],[5],[9]
Investment, Identifier [Axis]: Smile Doctors, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.04% [1],[2],[10],[12],[13],[14] 0.02% [3],[4],[5],[6],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 1,484,000  
Ending balance 2,467,000 [1],[2],[10],[12],[13],[14] $ 1,484,000 [3],[4],[5],[6],[8],[9]
Investment, Identifier [Axis]: Smile Doctors, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   1,036,000
Fair Value   0
Investment, Identifier [Axis]: Smile Doctors, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,233,000 1,233,000
Fair Value $ (43,000) $ (31,000)
Investment, Identifier [Axis]: Snoopy Bidco, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 5.25% [1],[2],[10],[13] 5.46% [3],[4],[5],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] $ 332,060,000  
Ending balance 330,335,000 [1],[2],[10],[13] $ 332,060,000 [3],[4],[5],[8],[9]
Investment, Identifier [Axis]: Spaceship Purchaser Inc    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[8],[9]   1.49%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 90,417,000  
Ending balance [3],[4],[5],[6],[8],[9]   $ 90,417,000
Investment, Identifier [Axis]: Spaceship Purchaser Inc, Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments   5,447,000
Fair Value   0
Investment, Identifier [Axis]: Spaceship Purchaser Inc, Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments   13,072,000
Fair Value   (65,000)
Investment, Identifier [Axis]: Spaceship Purchaser Inc, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   10,894,000
Fair Value   $ (109,000)
Investment, Identifier [Axis]: Spaceship Purchaser, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13],[14] 1.45%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13],[14] $ 91,103,000  
Investment, Identifier [Axis]: Spaceship Purchaser, Inc., Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments 5,447,000  
Fair Value 0  
Investment, Identifier [Axis]: Spaceship Purchaser, Inc., Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments 13,072,000  
Fair Value (65,000)  
Investment, Identifier [Axis]: Spaceship Purchaser, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 10,894,000  
Fair Value (109,000)  
Investment, Identifier [Axis]: Sparta UK Bidco Ltd    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[6],[7],[8],[9]   0.30%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[7],[8],[9] $ 18,008,000  
Ending balance [3],[4],[6],[7],[8],[9]   $ 18,008,000
Investment, Identifier [Axis]: Sparta UK Bidco Ltd, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   5,099,000
Fair Value   $ 0
Investment, Identifier [Axis]: Sparta UK Bidco, Ltd.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[14],[17] 0.38%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[14],[17] $ 24,038,000  
Investment, Identifier [Axis]: Sparta UK Bidco, Ltd., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 903,000  
Fair Value $ 0  
Investment, Identifier [Axis]: SpecialtyCare, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.19% [1],[2],[13],[15] 0.19% [3],[4],[8],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[8],[9],[16] $ 11,621,000  
Ending balance $ 11,679,000 [1],[2],[13],[15] $ 11,621,000 [3],[4],[8],[9],[16]
Investment, Identifier [Axis]: SpecialtyCare, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.01% [1],[2],[12],[13],[14],[17] 0.01% [3],[4],[6],[8],[9],[18]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[8],[9],[18] $ 643,000  
Ending balance $ 580,000 [1],[2],[12],[13],[14],[17] $ 643,000 [3],[4],[6],[8],[9],[18]
Investment, Identifier [Axis]: SpecialtyCare, Inc. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [1],[2],[12],[13],[15] 0.00% [3],[4],[8],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[8],[9],[16] $ 101,000  
Ending balance 101,000 [1],[2],[12],[13],[15] $ 101,000 [3],[4],[8],[9],[16]
Investment, Identifier [Axis]: SpecialtyCare, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 467,000 404,000
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Spectrum Safety Solutions Purchaser, LLC - Common Equity    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.10% [1],[2],[11],[13] 0.01% [3],[4],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 579,000  
Ending balance $ 6,186,000 [1],[2],[11],[13] $ 579,000 [3],[4],[9]
Investment, Identifier [Axis]: Spectrum Safety Solutions Purchaser, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 1.04% [1],[2],[11],[13],[14],[19] 0.99% [3],[4],[6],[8],[9],[28]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[8],[9],[28] $ 60,058,000  
Ending balance $ 65,577,000 [1],[2],[11],[13],[14],[19] $ 60,058,000 [3],[4],[6],[8],[9],[28]
Investment, Identifier [Axis]: Spectrum Safety Solutions Purchaser, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.28% [1],[2],[11],[12],[13],[19] 0.25% [3],[4],[7],[8],[9],[28]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[8],[9],[28] $ 15,487,000  
Ending balance $ 17,656,000 [1],[2],[11],[12],[13],[19] $ 15,487,000 [3],[4],[7],[8],[9],[28]
Investment, Identifier [Axis]: Spectrum Safety Solutions Purchaser, LLC 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.02% [1],[2],[11],[12],[13],[19] 0.03% [3],[4],[7],[8],[9],[28]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[8],[9],[28] $ 1,755,000  
Ending balance 1,043,000 [1],[2],[11],[12],[13],[19] $ 1,755,000 [3],[4],[7],[8],[9],[28]
Investment, Identifier [Axis]: Spectrum Safety Solutions Purchaser, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 12,901,000 16,126,000
Fair Value 0 (121,000)
Investment, Identifier [Axis]: Spectrum Safety Solutions Purchaser, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 13,135,000 14,298,000
Fair Value 0 $ (107,000)
Investment, Identifier [Axis]: Speedster Bidco GmbH    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[7],[9],[18]   0.57%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[9],[18] 34,534,000  
Ending balance [3],[4],[7],[9],[18]   $ 34,534,000
Investment, Identifier [Axis]: Speedster Bidco GmbH 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[6],[7],[9],[18]   0.19%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[7],[9],[18] 11,464,000  
Ending balance [3],[4],[6],[7],[9],[18]   $ 11,464,000
Investment, Identifier [Axis]: Speedster Bidco GmbH 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[7],[28]   0.05%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[28] $ 2,841,000  
Ending balance [3],[4],[7],[28]   $ 2,841,000
Investment, Identifier [Axis]: Speedster Bidco GmbH, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   1,801,000
Fair Value   $ (5,000)
Investment, Identifier [Axis]: Speedster Bidco, GmbH    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[13],[17] 0.59%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[13],[17] $ 36,826,000  
Investment, Identifier [Axis]: Speedster Bidco, GmbH 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[14],[17] 0.21%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[14],[17] $ 13,013,000  
Investment, Identifier [Axis]: Speedster Bidco, GmbH 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[19] 0.05%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[19] $ 2,843,000  
Investment, Identifier [Axis]: Speedster Bidco, GmbH, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,801,000  
Fair Value $ (8,000)  
Investment, Identifier [Axis]: Spitfire Parent, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.90% [1],[2],[13],[15] 0.94% [3],[4],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[16] $ 56,832,000  
Ending balance $ 56,571,000 [1],[2],[13],[15] $ 56,832,000 [3],[4],[9],[16]
Investment, Identifier [Axis]: Spitfire Parent, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.33% [1],[2],[13],[15] 0.35% [3],[4],[9],[28]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[28] $ 20,984,000  
Ending balance $ 20,876,000 [1],[2],[13],[15] $ 20,984,000 [3],[4],[9],[28]
Investment, Identifier [Axis]: Spitfire Parent, Inc. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.19% [1],[2],[12],[13],[15] 0.17% [3],[4],[8],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[8],[9],[16] $ 10,496,000  
Ending balance 11,874,000 [1],[2],[12],[13],[15] $ 10,496,000 [3],[4],[8],[9],[16]
Investment, Identifier [Axis]: Stamps.com, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[8],[9]   0.05%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] 3,224,000  
Ending balance [3],[4],[5],[8],[9]   $ 3,224,000
Investment, Identifier [Axis]: Stamps.com, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[9]   4.51%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 274,131,000  
Ending balance [3],[4],[5],[9]   $ 274,131,000
Investment, Identifier [Axis]: State Street Institutional U.S. Government Money Market Fund - Investor Class    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.33% [1],[2] 0.53% [3],[4]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4] $ 31,987,000  
Ending balance $ 20,521,000 [1],[2] $ 31,987,000 [3],[4]
Investment, Identifier [Axis]: Stepping Stones Healthcare Services, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.04% [1],[2],[10],[13] 0.04% [3],[4],[5],[8],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9],[16] $ 2,699,000  
Ending balance $ 2,685,000 [1],[2],[10],[13] $ 2,699,000 [3],[4],[5],[8],[9],[16]
Investment, Identifier [Axis]: Stepping Stones Healthcare Services, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [1],[2],[10],[12],[13],[14] 0.00% [3],[4],[5],[6],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 74,000  
Ending balance 203,000 [1],[2],[10],[12],[13],[14] $ 74,000 [3],[4],[5],[6],[8],[9]
Investment, Identifier [Axis]: Stepping Stones Healthcare Services, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 540,000 671,000
Fair Value 0 0
Investment, Identifier [Axis]: Stepping Stones Healthcare Services, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 371,000 371,000
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: TCFI AEVEX, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 1.72% [1],[2],[13],[15] 1.80% [3],[4],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[16] $ 109,088,000  
Ending balance 107,975,000 [1],[2],[13],[15] $ 109,088,000 [3],[4],[9],[16]
Investment, Identifier [Axis]: TEI Intermediate LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[9],[10]   0.42%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9],[10] 25,541,000  
Ending balance [3],[4],[5],[9],[10]   $ 25,541,000
Investment, Identifier [Axis]: TEI Intermediate LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[8],[9],[10]   0.01%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9],[10] $ 336,000  
Ending balance [3],[4],[5],[6],[8],[9],[10]   $ 336,000
Investment, Identifier [Axis]: TEI Intermediate LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   8,256,000
Fair Value   (41,000)
Investment, Identifier [Axis]: TEI Intermediate LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   3,096,000
Fair Value   $ 0
Investment, Identifier [Axis]: TEI Intermediate, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13] 0.41%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13] $ 25,670,000  
Investment, Identifier [Axis]: TEI Intermediate, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.01%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 437,000  
Investment, Identifier [Axis]: TEI Intermediate, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 8,256,000  
Fair Value (41,000)  
Investment, Identifier [Axis]: TEI Intermediate, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 3,013,000  
Fair Value 0  
Investment, Identifier [Axis]: THG Acquisition LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[8],[9]   0.19%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 11,606,000  
Ending balance [3],[4],[5],[6],[8],[9]   $ 11,606,000
Investment, Identifier [Axis]: THG Acquisition LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   2,598,000
Fair Value   (13,000)
Investment, Identifier [Axis]: THG Acquisition LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   1,202,000
Fair Value   $ 0
Investment, Identifier [Axis]: THG Acquisition, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13] 0.18%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13] $ 11,623,000  
Investment, Identifier [Axis]: THG Acquisition, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 179,000  
Investment, Identifier [Axis]: THG Acquisition, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 2,515,000  
Fair Value 0  
Investment, Identifier [Axis]: THG Acquisition, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,202,000  
Fair Value $ 0  
Investment, Identifier [Axis]: THL Fund IX Investors (Plymouth II), LP - LP Interest    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.01% [1],[2],[13] 0.01% [3],[4],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 346,000  
Ending balance $ 448,000 [1],[2],[13] $ 346,000 [3],[4],[9]
Investment, Identifier [Axis]: TPG IX Newark CI, L.P. - LP Interest    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.03% [1],[2],[13] 0.03% [3],[4],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 1,966,000  
Ending balance $ 1,966,000 [1],[2],[13] $ 1,966,000 [3],[4],[9]
Investment, Identifier [Axis]: TRP Infrastructure Services, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.61% [1],[2],[13],[15] 0.63% [3],[4],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[16] $ 38,101,000  
Ending balance $ 38,288,000 [1],[2],[13],[15] $ 38,101,000 [3],[4],[9],[16]
Investment, Identifier [Axis]: TRP Infrastructure Services, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.36% [1],[2],[12],[13],[14],[15] 0.21% [3],[4],[6],[8],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[8],[9],[16] $ 13,003,000  
Ending balance 22,466,000 [1],[2],[12],[13],[14],[15] $ 13,003,000 [3],[4],[6],[8],[9],[16]
Investment, Identifier [Axis]: TRP Infrastructure Services, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 1,346,000 10,766,000
Fair Value $ 0 $ (54,000)
Investment, Identifier [Axis]: Tailwind Colony Holding Corporation    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.73% [1],[2],[13],[15] 0.77% [3],[4],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[16] $ 46,602,000  
Ending balance 45,778,000 [1],[2],[13],[15] $ 46,602,000 [3],[4],[9],[16]
Investment, Identifier [Axis]: Tango Bidco SAS 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[7],[8],[9],[18]   0.20%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[8],[9],[18] 12,124,000  
Ending balance [3],[4],[7],[8],[9],[18]   $ 12,124,000
Investment, Identifier [Axis]: Tango Bidco SAS 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[6],[7],[8],[9],[18]   0.04%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[7],[8],[9],[18] $ 2,596,000  
Ending balance [3],[4],[6],[7],[8],[9],[18]   $ 2,596,000
Investment, Identifier [Axis]: Tango Bidco SAS, Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments   962,000
Fair Value   (6,000)
Investment, Identifier [Axis]: Tango Bidco SAS, Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments   2,305,000
Fair Value   $ 0
Investment, Identifier [Axis]: Tango Bidco, SAS 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[17] 0.22%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[17] $ 13,845,000  
Investment, Identifier [Axis]: Tango Bidco, SAS 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[14],[17] 0.06%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[14],[17] $ 3,768,000  
Investment, Identifier [Axis]: Tango Bidco, SAS, Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments 962,000  
Fair Value (7,000)  
Investment, Identifier [Axis]: Tango Bidco, SAS, Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments 1,580,000  
Fair Value 0  
Investment, Identifier [Axis]: Tennessee Bidco Limited 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[7],[9],[18]   1.46%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[9],[18] 88,637,000  
Ending balance [3],[4],[7],[9],[18]   $ 88,637,000
Investment, Identifier [Axis]: Tennessee Bidco Limited 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[7],[8],[9],[18]   0.09%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[8],[9],[18] 5,633,000  
Ending balance [3],[4],[7],[8],[9],[18]   $ 5,633,000
Investment, Identifier [Axis]: Tennessee Bidco Limited 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[7],[8],[9],[18]   0.92%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[8],[9],[18] 55,671,000  
Ending balance [3],[4],[7],[8],[9],[18]   $ 55,671,000
Investment, Identifier [Axis]: Tennessee Bidco Limited 4    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[6],[7],[8],[9],[18]   0.05%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[7],[8],[9],[18] 2,971,000  
Ending balance [3],[4],[6],[7],[8],[9],[18]   $ 2,971,000
Investment, Identifier [Axis]: Tennessee Bidco Limited 5    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[7],[8],[9],[18]   0.03%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[8],[9],[18] 1,926,000  
Ending balance [3],[4],[7],[8],[9],[18]   $ 1,926,000
Investment, Identifier [Axis]: Tennessee Bidco Limited 6    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[7],[8],[9],[18]   0.03%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[8],[9],[18] $ 1,717,000  
Ending balance [3],[4],[7],[8],[9],[18]   $ 1,717,000
Investment, Identifier [Axis]: Tennessee Bidco Limited, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   22,998,000
Fair Value   $ 0
Investment, Identifier [Axis]: Tennessee Bidco, Limited 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[13],[17] 1.34%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[13],[17] $ 84,166,000  
Investment, Identifier [Axis]: Tennessee Bidco, Limited 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[17] 0.09%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[17] $ 5,348,000  
Investment, Identifier [Axis]: Tennessee Bidco, Limited 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[17] 0.99%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[17] $ 62,282,000  
Investment, Identifier [Axis]: Tennessee Bidco, Limited 4    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[14],[17] 0.05%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[14],[17] $ 3,453,000  
Investment, Identifier [Axis]: Tennessee Bidco, Limited 5    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[17] 0.04%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[17] $ 2,235,000  
Investment, Identifier [Axis]: Tennessee Bidco, Limited 6    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[17] 0.03%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[17] $ 1,992,000  
Investment, Identifier [Axis]: Tennessee Bidco, Limited, Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments 22,998,000  
Fair Value 0  
Investment, Identifier [Axis]: Tennessee Bidco, Limited, Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments 24,577,000  
Fair Value $ (127,000)  
Investment, Identifier [Axis]: The Fertility Partners, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.08% [1],[2],[10],[11],[12],[13] 0.08% [3],[4],[5],[7],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[7],[8],[9] $ 4,837,000  
Ending balance $ 4,761,000 [1],[2],[10],[11],[12],[13] $ 4,837,000 [3],[4],[5],[7],[8],[9]
Investment, Identifier [Axis]: The Fertility Partners, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.05% [1],[2],[10],[11],[12],[13] 0.05% [3],[4],[5],[7],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[7],[8],[9] $ 3,188,000  
Ending balance $ 3,312,000 [1],[2],[10],[11],[12],[13] $ 3,188,000 [3],[4],[5],[7],[8],[9]
Investment, Identifier [Axis]: The Fertility Partners, Inc. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [1],[2],[10],[11],[12],[13],[14] 0.00% [3],[4],[5],[6],[7],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[7],[8],[9] $ 58,000  
Ending balance 186,000 [1],[2],[10],[11],[12],[13],[14] $ 58,000 [3],[4],[5],[6],[7],[8],[9]
Investment, Identifier [Axis]: The Fertility Partners, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 60,000 211,000
Fair Value 0 $ 0
Investment, Identifier [Axis]: The GI Alliance Management, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[8],[9],[16]   0.07%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[8],[9],[16] 4,065,000  
Ending balance [3],[4],[8],[9],[16]   $ 4,065,000
Investment, Identifier [Axis]: The GI Alliance Management, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[8],[9],[16]   0.01%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[8],[9],[16] 451,000  
Ending balance [3],[4],[8],[9],[16]   $ 451,000
Investment, Identifier [Axis]: The GI Alliance Management, LLC 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[8],[9],[16]   0.01%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[8],[9],[16] 876,000  
Ending balance [3],[4],[8],[9],[16]   $ 876,000
Investment, Identifier [Axis]: The GI Alliance Management, LLC 4    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[6],[8],[9],[16]   0.18%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[8],[9],[16] $ 10,913,000  
Ending balance [3],[4],[6],[8],[9],[16]   $ 10,913,000
Investment, Identifier [Axis]: The GI Alliance Management, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   35,604,000
Fair Value   $ 0
Investment, Identifier [Axis]: The Hiller Companies, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [10] 0.13% [1],[2],[13] 0.13% [3],[4],[5],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9],[10] $ 8,152,000  
Ending balance [10] $ 8,111,000 [1],[2],[13] $ 8,152,000 [3],[4],[5],[9]
Investment, Identifier [Axis]: The Hiller Companies, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [10] 0.03% [1],[2],[12],[13],[14] 0.01% [3],[4],[5],[6],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9],[10] $ 542,000  
Ending balance [10] 1,922,000 [1],[2],[12],[13],[14] $ 542,000 [3],[4],[5],[6],[8],[9]
Investment, Identifier [Axis]: The Hiller Companies, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 310,000 1,696,000
Fair Value 0 0
Investment, Identifier [Axis]: The Hiller Companies, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,432,000 1,432,000
Fair Value (11,000) $ (11,000)
Investment, Identifier [Axis]: The North Highland Co LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[8],[9]   0.26%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] 15,862,000  
Ending balance [3],[4],[5],[8],[9]   $ 15,862,000
Investment, Identifier [Axis]: The North Highland Co LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[8],[9]   0.01%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 772,000  
Ending balance [3],[4],[5],[6],[8],[9]   $ 772,000
Investment, Identifier [Axis]: The North Highland Co LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   5,903,000
Fair Value   (30,000)
Investment, Identifier [Axis]: The North Highland Co LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   3,373,000
Fair Value   $ 0
Investment, Identifier [Axis]: The North Highland Co, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13] 0.25%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13] $ 15,863,000  
Investment, Identifier [Axis]: The North Highland Co, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.04%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 2,732,000  
Investment, Identifier [Axis]: The North Highland Co, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 5,903,000  
Fair Value (30,000)  
Investment, Identifier [Axis]: The North Highland Co, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,434,000  
Fair Value $ 0  
Investment, Identifier [Axis]: Thevelia US, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.02% [1],[2],[11],[12],[19] 0.02% [3],[4],[7],[9],[28]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[9],[28] $ 1,292,000  
Ending balance $ 1,279,000 [1],[2],[11],[12],[19] $ 1,292,000 [3],[4],[7],[9],[28]
Investment, Identifier [Axis]: Thevelia US, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[19] 0.08%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[19] $ 4,920,000  
Investment, Identifier [Axis]: Thevelia US, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[7],[8],[9],[28]   0.08%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[8],[9],[28] $ 4,920,000  
Ending balance [3],[4],[7],[8],[9],[28]   $ 4,920,000
Investment, Identifier [Axis]: Titan Investment Company, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.61% [1],[2],[13],[17] 0.63% [3],[4],[9],[18]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[18] $ 38,488,000  
Ending balance $ 38,286,000 [1],[2],[13],[17] $ 38,488,000 [3],[4],[9],[18]
Investment, Identifier [Axis]: Tricentis Operations Holdings, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[12],[13],[14],[15] 0.37%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[12],[13],[14],[15] $ 23,087,000  
Investment, Identifier [Axis]: Tricentis Operations Holdings, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 4,595,000  
Fair Value (23,000)  
Investment, Identifier [Axis]: Tricentis Operations Holdings, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 2,872,000  
Fair Value $ (29,000)  
Investment, Identifier [Axis]: Tricentis, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   4,549,000
Fair Value   0
Investment, Identifier [Axis]: Tricentis, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   2,843,000
Fair Value   0
Investment, Identifier [Axis]: Tricentis, Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   22,745,000
Fair Value   $ 0
Investment, Identifier [Axis]: Tricor Horizon - LP Interest    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.01% [1],[2],[11],[13] 0.01% [3],[4],[7],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[9] $ 416,000  
Ending balance 426,000 [1],[2],[11],[13] $ 416,000 [3],[4],[7],[9]
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corp - Common Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[9]   0.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 6,000  
Ending balance [3],[4],[9]   $ 6,000
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corp. - Common Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[13] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[13] $ 6,000  
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corp. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.95% [1],[2],[10],[13] 0.99% [3],[4],[5],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 59,901,000  
Ending balance $ 59,901,000 [1],[2],[10],[13] $ 59,901,000 [3],[4],[5],[9]
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corp. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.55% [1],[2],[10],[13],[14] 0.46% [3],[4],[5],[6],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[9] $ 27,747,000  
Ending balance 34,698,000 [1],[2],[10],[13],[14] $ 27,747,000 [3],[4],[5],[6],[9]
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corp., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   7,907,000
Fair Value   0
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corp., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 7,269,000 7,269,000
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: Trinity Partners Holdings LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[13],[14],[15],[24] 0.07%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[13],[14],[15],[24] $ 4,685,000  
Investment, Identifier [Axis]: Trinity Partners Holdings, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[6],[9],[16],[26]   0.08%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[9],[16],[26] 4,687,000  
Ending balance [3],[4],[6],[9],[16],[26]   $ 4,687,000
Investment, Identifier [Axis]: Trinity Partners Holdings, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 1,433,000 1,433,000
Fair Value $ 0 $ (14,000)
Investment, Identifier [Axis]: Triple Lift, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.21% [1],[2],[10],[13] 0.21% [3],[4],[5],[6],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[9] $ 12,884,000  
Ending balance $ 13,124,000 [1],[2],[10],[13] $ 12,884,000 [3],[4],[5],[6],[9]
Investment, Identifier [Axis]: Triple Lift, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.71% [1],[2],[10],[13],[14] 0.75% [3],[4],[5],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 45,394,000  
Ending balance 44,895,000 [1],[2],[10],[13],[14] $ 45,394,000 [3],[4],[5],[9]
Investment, Identifier [Axis]: Triple Lift, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 7,697,000 7,697,000
Fair Value $ (308,000) $ (308,000)
Investment, Identifier [Axis]: Turing Holdco, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.14% [1],[2],[11],[12],[13],[17] 0.14% [3],[4],[7],[8],[9],[18]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[8],[9],[18] $ 8,766,000  
Ending balance $ 8,727,000 [1],[2],[11],[12],[13],[17] $ 8,766,000 [3],[4],[7],[8],[9],[18]
Investment, Identifier [Axis]: Turing Holdco, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.07% [1],[2],[11],[12],[13],[17] 0.07% [3],[4],[6],[7],[8],[9],[18]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[7],[8],[9],[18] $ 4,363,000  
Ending balance $ 4,340,000 [1],[2],[11],[12],[13],[17] $ 4,363,000 [3],[4],[6],[7],[8],[9],[18]
Investment, Identifier [Axis]: Turing Holdco, Inc. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.21% [1],[2],[11],[12],[13],[17] 0.19% [3],[4],[7],[8],[9],[18]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[8],[9],[18] $ 11,707,000  
Ending balance $ 13,252,000 [1],[2],[11],[12],[13],[17] $ 11,707,000 [3],[4],[7],[8],[9],[18]
Investment, Identifier [Axis]: Turing Holdco, Inc. 4    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.08% [1],[2],[11],[12],[13],[17] 0.07% [3],[4],[7],[8],[9],[18]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[7],[8],[9],[18] $ 4,482,000  
Ending balance $ 5,041,000 [1],[2],[11],[12],[13],[17] $ 4,482,000 [3],[4],[7],[8],[9],[18]
Investment, Identifier [Axis]: Turing Holdco, Inc. 5    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.33% [1],[2],[10],[11],[13],[14] 0.34% [3],[4],[5],[7],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[7],[9] $ 20,630,000  
Ending balance $ 20,520,000 [1],[2],[10],[11],[13],[14] $ 20,630,000 [3],[4],[5],[7],[9]
Investment, Identifier [Axis]: Turing Holdco, Inc. 6    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.34% [1],[2],[10],[11],[12],[13],[14] 0.32% [3],[4],[5],[6],[7],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[7],[8],[9] $ 19,408,000  
Ending balance 21,165,000 [1],[2],[10],[11],[12],[13],[14] $ 19,408,000 [3],[4],[5],[6],[7],[8],[9]
Investment, Identifier [Axis]: Turing Holdco, Inc., Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments 28,117,000 28,117,000
Fair Value 0 0
Investment, Identifier [Axis]: Turing Holdco, Inc., Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments 20,901,000 20,901,000
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: UMP Holdings, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.02% [1],[2],[10],[12],[13] 0.02% [3],[4],[5],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] $ 1,079,000  
Ending balance $ 1,073,000 [1],[2],[10],[12],[13] $ 1,079,000 [3],[4],[5],[8],[9]
Investment, Identifier [Axis]: UMP Holdings, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.02% [1],[2],[10],[12],[13] 0.02% [3],[4],[5],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] $ 1,480,000  
Ending balance $ 1,469,000 [1],[2],[10],[12],[13] $ 1,480,000 [3],[4],[5],[8],[9]
Investment, Identifier [Axis]: US Oral Surgery Management Holdco, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.59% [1],[2],[10],[13] 0.61% [3],[4],[5],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 37,021,000  
Ending balance $ 37,021,000 [1],[2],[10],[13] $ 37,021,000 [3],[4],[5],[9]
Investment, Identifier [Axis]: US Oral Surgery Management Holdco, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.25% [1],[2],[10],[13] 0.26% [3],[4],[5],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 15,616,000  
Ending balance $ 15,616,000 [1],[2],[10],[13] $ 15,616,000 [3],[4],[5],[9]
Investment, Identifier [Axis]: US Oral Surgery Management Holdco, LLC 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.54% [1],[2],[10],[13],[14] 0.45% [3],[4],[5],[6],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[9] $ 27,426,000  
Ending balance $ 34,187,000 [1],[2],[10],[13],[14] $ 27,426,000 [3],[4],[5],[6],[9]
Investment, Identifier [Axis]: US Oral Surgery Management Holdco, LLC 4    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [1],[2],[10],[12],[13] 0.00% [3],[4],[5],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] $ 83,000  
Ending balance 83,000 [1],[2],[10],[12],[13] $ 83,000 [3],[4],[5],[8],[9]
Investment, Identifier [Axis]: US Oral Surgery Management Holdco, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 34,998,000 41,551,000
Fair Value 0 (208,000)
Investment, Identifier [Axis]: US Oral Surgery Management Holdco, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 3,735,000 3,735,000
Fair Value 0 $ 0
Investment, Identifier [Axis]: Unified Women's Healthcare LP 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[8],[9],[28]   0.03%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[8],[9],[28] 2,081,000  
Ending balance [3],[4],[8],[9],[28]   $ 2,081,000
Investment, Identifier [Axis]: Unified Women's Healthcare LP 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[6],[8],[9],[28]   0.32%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[8],[9],[28] $ 19,419,000  
Ending balance [3],[4],[6],[8],[9],[28]   $ 19,419,000
Investment, Identifier [Axis]: Unified Women's Healthcare LP, Delayed Draw Term Loan 1    
Schedule of Investments [Line Items]    
Unfunded commitments   2,895,000
Fair Value   0
Investment, Identifier [Axis]: Unified Women's Healthcare LP, Delayed Draw Term Loan 2    
Schedule of Investments [Line Items]    
Unfunded commitments   44,793,000
Fair Value   0
Investment, Identifier [Axis]: Unified Women's Healthcare LP, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   241,000
Fair Value   $ 0
Investment, Identifier [Axis]: Unified Women's Healthcare, LP 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[12],[13],[19] 0.03%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[12],[13],[19] $ 2,071,000  
Investment, Identifier [Axis]: Unified Women's Healthcare, LP 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[13],[19] 0.36%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[13],[19] $ 22,461,000  
Investment, Identifier [Axis]: Unified Women's Healthcare, LP 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[12],[13],[14],[19] 0.49%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[12],[13],[14],[19] $ 30,526,000  
Investment, Identifier [Axis]: Unified Women's Healthcare, LP, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 14,190,000  
Fair Value 0  
Investment, Identifier [Axis]: Unified Women's Healthcare, LP, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 241,000  
Fair Value 0  
Investment, Identifier [Axis]: Varicent Parent Holdings Corp    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[8],[9]   0.20%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 11,998,000  
Ending balance [3],[4],[5],[6],[8],[9]   $ 11,998,000
Investment, Identifier [Axis]: Varicent Parent Holdings Corp, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   2,794,000
Fair Value   (21,000)
Investment, Identifier [Axis]: Varicent Parent Holdings Corp, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   1,557,000
Fair Value   $ (23,000)
Investment, Identifier [Axis]: Varicent Parent Holdings Corp.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.20%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 12,417,000  
Investment, Identifier [Axis]: Varicent Parent Holdings Corp., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 2,352,000  
Fair Value (18,000)  
Investment, Identifier [Axis]: Varicent Parent Holdings Corp., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,557,000  
Fair Value $ (23,000)  
Investment, Identifier [Axis]: Veregy Consolidated, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.44% [1],[2],[10],[12],[13],[14] 0.34% [3],[4],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[16] $ 20,479,000  
Ending balance 27,504,000 [1],[2],[10],[12],[13],[14] $ 20,479,000 [3],[4],[16]
Investment, Identifier [Axis]: Veregy Consolidated, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 2,436,000  
Fair Value (9,000)  
Investment, Identifier [Axis]: Veregy Consolidated, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 5,845,000  
Fair Value $ (44,000)  
Investment, Identifier [Axis]: Victory Buyer, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.15% [1],[2],[13],[19] 0.15% [3],[4],[9],[28]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[28] $ 9,188,000  
Ending balance 9,427,000 [1],[2],[13],[19] $ 9,188,000 [3],[4],[9],[28]
Investment, Identifier [Axis]: WHCG Purchaser III Inc 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[8],[9]   0.33%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] 19,921,000  
Ending balance [3],[4],[5],[6],[8],[9]   $ 19,921,000
Investment, Identifier [Axis]: WHCG Purchaser III Inc 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[8],[9],[25]   0.10%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9],[25] $ 6,167,000  
Ending balance [3],[4],[5],[8],[9],[25]   $ 6,167,000
Investment, Identifier [Axis]: WHCG Purchaser III Inc, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   7,044,000
Fair Value   $ 0
Investment, Identifier [Axis]: WHCG Purchaser III, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.33%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 20,467,000  
Investment, Identifier [Axis]: WHCG Purchaser III, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[23] 0.11%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[23] $ 7,121,000  
Investment, Identifier [Axis]: WHCG Purchaser III, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 7,044,000  
Fair Value $ 0  
Investment, Identifier [Axis]: WHCG Purchaser, Inc. - Class A Common Units    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [1],[2],[13] 0.00% [3],[4],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 0  
Ending balance $ 0 [1],[2],[13] $ 0 [3],[4],[9]
Investment, Identifier [Axis]: WPEngine, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 1.06% [1],[2],[10],[13],[14] 1.09% [3],[4],[5],[6],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 66,467,000  
Ending balance 66,467,000 [1],[2],[10],[13],[14] $ 66,467,000 [3],[4],[5],[6],[8],[9]
Investment, Identifier [Axis]: WPEngine, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 6,667,000 6,667,000
Fair Value (200,000) $ (200,000)
Investment, Identifier [Axis]: Water Holdings Acquisition LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[9]   0.51%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[9] $ 31,057,000  
Ending balance [3],[4],[5],[6],[9]   $ 31,057,000
Investment, Identifier [Axis]: Water Holdings Acquisition LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   5,754,000
Fair Value   $ 0
Investment, Identifier [Axis]: Water Holdings Acquisition, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13] 0.50%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13] $ 31,551,000  
Investment, Identifier [Axis]: Water Holdings Acquisition, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.04%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 2,286,000  
Investment, Identifier [Axis]: Water Holdings Acquisition, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 3,708,000  
Fair Value $ 0  
Investment, Identifier [Axis]: West Monroe Partners, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.23% [1],[2],[10],[13] 0.24% [3],[4],[5],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[9] $ 14,450,000  
Ending balance $ 14,376,000 [1],[2],[10],[13] $ 14,450,000 [3],[4],[5],[9]
Investment, Identifier [Axis]: West Monroe Partners, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.01% [1],[2],[10],[12],[13],[14] 0.01% [3],[4],[5],[6],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 494,000  
Ending balance 587,000 [1],[2],[10],[12],[13],[14] $ 494,000 [3],[4],[5],[6],[8],[9]
Investment, Identifier [Axis]: West Monroe Partners, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 2,500,000 2,500,000
Fair Value 0 0
Investment, Identifier [Axis]: West Monroe Partners, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,347,000 1,443,000
Fair Value $ 0 $ 0
Investment, Identifier [Axis]: West Star Aviation Acquisition, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[12],[13] 0.03%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[12],[13] $ 2,136,000  
Investment, Identifier [Axis]: West Star Aviation Acquisition, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 56,000  
Investment, Identifier [Axis]: West Star Aviation Acquisition, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 451,000  
Fair Value (2,000)  
Investment, Identifier [Axis]: West Star Aviation Acquisition, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 241,000  
Fair Value $ 0  
Investment, Identifier [Axis]: Windows Acquisition Holdings, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.67% [1],[2],[12],[13],[15] 0.70% [3],[4],[5],[8],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9],[16] $ 42,274,000  
Ending balance $ 42,026,000 [1],[2],[12],[13],[15] $ 42,274,000 [3],[4],[5],[8],[9],[16]
Investment, Identifier [Axis]: World Insurance Associates, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.55% [1],[2],[13],[15] 0.62% [3],[4],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9],[16] $ 37,826,000  
Ending balance $ 34,563,000 [1],[2],[13],[15] $ 37,826,000 [3],[4],[9],[16]
Investment, Identifier [Axis]: World Insurance Associates, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.53% [1],[2],[13],[15] 0.53% [3],[4],[6],[9],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[9],[16] $ 32,343,000  
Ending balance $ 33,200,000 [1],[2],[13],[15] $ 32,343,000 [3],[4],[6],[9],[16]
Investment, Identifier [Axis]: World Insurance Associates, LLC 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[13],[14],[15] 0.06%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[13],[14],[15] $ 3,555,000  
Investment, Identifier [Axis]: World Insurance Associates, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 40,362,000 14,682,000
Fair Value (199,000) 0
Investment, Identifier [Axis]: World Insurance Associates, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 4,473,000 2,939,000
Fair Value $ (66,000) $ 0
Investment, Identifier [Axis]: YA Intermediate Holdings II, LLC 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.12% [1],[2],[10],[12],[13] 0.13% [3],[4],[5],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[8],[9] $ 7,816,000  
Ending balance $ 7,848,000 [1],[2],[10],[12],[13] $ 7,816,000 [3],[4],[5],[8],[9]
Investment, Identifier [Axis]: YA Intermediate Holdings II, LLC 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.01% [1],[2],[10],[12],[13],[14] 0.00% [3],[4],[5],[6],[8],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 47,000  
Ending balance 663,000 [1],[2],[10],[12],[13],[14] $ 47,000 [3],[4],[5],[6],[8],[9]
Investment, Identifier [Axis]: YA Intermediate Holdings II, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 2,937,000 3,286,000
Fair Value 0 (16,000)
Investment, Identifier [Axis]: YA Intermediate Holdings II, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 1,262,000 1,499,000
Fair Value 0 0
Investment, Identifier [Axis]: Zellis TopCo Limited, Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   7,765,000
Fair Value   $ 0
Investment, Identifier [Axis]: Zendesk Inc    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[5],[6],[8],[9]   0.03%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[8],[9] $ 1,614,000  
Ending balance [3],[4],[5],[6],[8],[9]   $ 1,614,000
Investment, Identifier [Axis]: Zendesk Inc, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   361,000
Fair Value   (5,000)
Investment, Identifier [Axis]: Zendesk Inc, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments   169,000
Fair Value   $ 0
Investment, Identifier [Axis]: Zendesk, Inc.    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.03%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 1,719,000  
Investment, Identifier [Axis]: Zendesk, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 247,000  
Fair Value 0  
Investment, Identifier [Axis]: Zendesk, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 169,000  
Fair Value $ 0  
Investment, Identifier [Axis]: Zeus, LLC    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.41% [1],[2],[10],[13],[14] 0.43% [3],[4],[5],[6],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[5],[6],[9] $ 26,009,000  
Ending balance 25,702,000 [1],[2],[10],[13],[14] $ 26,009,000 [3],[4],[5],[6],[9]
Investment, Identifier [Axis]: Zeus, LLC, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 2,284,000 2,969,000
Fair Value 0 0
Investment, Identifier [Axis]: Zeus, LLC, Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 3,426,000 3,426,000
Fair Value $ (17,000) $ (17,000)
Investment, Identifier [Axis]: Zoro - Common Equity    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.00% [1],[2],[13] 0.00% [3],[4],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 22,000  
Ending balance $ 23,000 [1],[2],[13] $ 22,000 [3],[4],[9]
Investment, Identifier [Axis]: Zoro - Series A Preferred Shares    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets 0.01% [1],[2],[13] 0.01% [3],[4],[9]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[9] $ 492,000  
Ending balance 368,000 [1],[2],[13] $ 492,000 [3],[4],[9]
Investment, Identifier [Axis]: Zorro Bidco Ltd    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [3],[4],[6],[7],[8],[9],[18]   0.53%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Beginning balance [3],[4],[6],[7],[8],[9],[18] $ 32,502,000  
Ending balance [3],[4],[6],[7],[8],[9],[18]   $ 32,502,000
Investment, Identifier [Axis]: Zorro Bidco Ltd, Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments   7,647,000
Fair Value   $ (73,000)
Investment, Identifier [Axis]: Zorro Bidco, Ltd. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[14],[17] 0.62%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[14],[17] $ 39,250,000  
Investment, Identifier [Axis]: Zorro Bidco, Ltd. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[17] 0.07%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[17] $ 4,301,000  
Investment, Identifier [Axis]: Zorro Bidco, Ltd. 3    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[11],[12],[13],[17] 0.07%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[11],[12],[13],[17] $ 4,540,000  
Investment, Identifier [Axis]: Zorro Bidco, Ltd., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 4,201,000  
Fair Value $ 0  
Investment, Identifier [Axis]: eResearchTechnology, Inc. 1    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[13] 2.41%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[13] $ 151,265,000  
Investment, Identifier [Axis]: eResearchTechnology, Inc. 2    
Schedule of Investments [Line Items]    
Fair Value as % of Net Assets [1],[2],[10],[12],[13],[14] 0.46%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ending balance [1],[2],[10],[12],[13],[14] $ 28,719,000  
Investment, Identifier [Axis]: eResearchTechnology, Inc., Delayed Draw Term Loan    
Schedule of Investments [Line Items]    
Unfunded commitments 24,793,000  
Fair Value 0  
Investment, Identifier [Axis]: eResearchTechnology, Inc., Revolver    
Schedule of Investments [Line Items]    
Unfunded commitments 14,414,000  
Fair Value $ (144,000)  
[1]
(1)Unless otherwise indicated, all debt and equity investments held by the Company (which such term “Company” shall include the Company’s consolidated subsidiaries for purposes of this Condensed Consolidated Schedule of Investments) are denominated in U.S. dollars. As of June 30, 2025, the Company had investments denominated in Canadian Dollars (CAD), Euros (EUR), British Pounds (GBP), Danish Krone (DKK), Swedish Krona (SEK), Norwegian Krone (NOK), and Australian Dollars (AUD). All debt investments are income producing unless otherwise indicated. All equity investments are non-income producing unless otherwise noted. Certain portfolio company investments are subject to contractual restrictions on sales. The total par amount (in thousands) is presented for debt investments, while the number of shares or units (in whole amounts) owned is presented for equity investments. Each of the Company’s investments is pledged as collateral, under one or more of its credit facilities unless otherwise indicated.
[2] All securities are exempt from registration under the Securities Act of 1933, as amended (the “Securities Act”), excluding Axsome Therapeutics, Inc. - Common Stock, and may be deemed to be “restricted securities.” As of June 30, 2025, the aggregate fair value of these securities is $13,251.4 million or 210.76% of the Company’s net assets. The initial acquisition dates have been included for such securities.
[3] All securities are exempt from registration under the Securities Act of 1933, as amended (the “Securities Act”), and may be deemed to be “restricted securities.” As of December 31, 2024, the aggregate fair value of these securities is $13,092.5 million or 215.43% of the Company’s net assets. The initial acquisition dates have been included for such securities.
[4] Unless otherwise indicated, all debt and equity investments held by the Company (which such term “Company” shall include the Company’s consolidated subsidiaries for purposes of this Condensed Consolidated Schedule of Investments) are denominated in dollars. As of December 31, 2024, the Company had investments denominated in Canadian Dollars (CAD), Euros (EUR), British Pounds (GBP), Danish Krone (DKK), Swedish Krona (SEK), Norwegian Krone (NOK), and Australian Dollars (AUD). All debt investments are income producing unless otherwise indicated. All equity investments are non-income producing unless otherwise noted. Certain portfolio company investments are subject to contractual restrictions on sales. The total par amount (in thousands) is presented for debt investments, while the number of shares or units (in whole amounts) owned is presented for equity investments. Each of the Company’s investments is pledged as collateral, under one or more of its credit facilities unless otherwise indicated.
[5] The interest rate floor on these investments as of December 31, 2024 was 0.75%.
[6] Position or portion thereof is an unfunded commitment, and no interest is being earned on the unfunded portion, although the investment may be subject to unused commitment fees. Negative cost and fair value results from unamortized fees, which are capitalized to the investment cost. The unfunded commitment may be subject to a commitment termination date that may expire prior to the maturity date stated. See below for more information on the Company’s unfunded commitments:
[7] The investment is not a Qualifying Asset under Section 55(a) of the Investment Company Act of 1940, as amended (together with the rules and regulations promulgated thereunder, the “1940 Act”). The Company may not acquire any non-qualifying asset unless, at the time of acquisition, Qualifying Assets represent at least 70% of the Company’s total assets. As of December 31, 2024, non-qualifying assets represented 14.8% of total assets as calculated in accordance with regulatory requirements.
[8] These investments are not pledged as collateral under any of the Company’s credit facilities. For other debt investments that are pledged to the Company’s credit facilities, a single investment may be divided into parts that are individually pledged as collateral to separate credit facilities. Any other debt investments listed above are pledged to financing facilities and are not available to satisfy the creditors of the Company.
[9] These investments were valued using unobservable inputs and are considered Level 3 investments. Fair value was determined in good faith by or under the direction of the Board of Trustees (see Note 2), pursuant to the Company’s valuation policy.
[10] The interest rate floor on these investments as of June 30, 2025 was 0.75%.
[11] The investment is not a Qualifying Asset under Section 55(a) of the Investment Company Act of 1940, as amended (together with the rules and regulations promulgated thereunder, the “1940 Act”). The Company may not acquire any non-qualifying asset unless, at the time of acquisition, Qualifying Assets represent at least 70% of the Company’s total assets. As of June 30, 2025, non-qualifying assets represented 14.6% of total assets as calculated in accordance with regulatory requirements.
[12] These investments are not pledged as collateral under any of the Company’s credit facilities. For other debt investments that are pledged to the Company’s credit facilities, a single investment may be divided into parts that are individually pledged as collateral to separate credit facilities. Any other debt investments listed above are pledged to financing facilities and are not available to satisfy the creditors of the Company.
[13] These investments were valued using unobservable inputs and are considered Level 3 investments. Fair value was determined in good faith by or under the direction of the Board of Trustees (see Note 2), pursuant to the Company’s valuation policy.
[14] Position or portion thereof is an unfunded commitment, and no interest is being earned on the unfunded portion, although the investment may be subject to unused commitment fees. Negative cost and fair value results from unamortized fees, which are capitalized to the investment cost. The unfunded commitment may be subject to a commitment termination date that may expire prior to the maturity date stated. See below for more information on the Company’s unfunded commitments:
[15] The interest rate floor on these investments as of June 30, 2025 was 1.00%.
[16] The interest rate floor on these investments as of December 31, 2024 was 1.00%.
[17] There are no interest rate floors on these investments.
[18] There are no interest rate floors on these investments.
[19] The interest rate floor on these investments as of June 30, 2025 was 0.50%.
[20] The interest rate floor on these investments as of December 31, 2024 was 1.50%.
[21] Under the 1940 Act, the Company would be deemed to “control” a portfolio company if the Company owned more than 25% of its outstanding voting securities and/or held the power to exercise control over the management or policies of the portfolio company. Under the 1940 Act, the Company would be deemed an “affiliated person” of a portfolio company if the Company owns 5% or more of the portfolio company’s outstanding voting securities. As of June 30, 2025, the Company’s non-controlled/affiliated investments were as follows:
[22] Under the 1940 Act, the Company would be deemed to “control” a portfolio company if the Company owned more than 25% of its outstanding voting securities and/or held the power to exercise control over the management or policies of the portfolio company. Under the 1940 Act, the Company would be deemed an “affiliated person” of a portfolio company if the Company owns 5% or more of the portfolio company’s outstanding voting securities. As of December 31, 2024, the Company’s non-controlled/affiliated investments were as follows:
Fair Value as of December 31, 2023
Gross AdditionsGross ReductionsNet Change in Unrealized Gains (Losses)Net Realized Gain (Loss)
Fair Value as of December 31, 2024
Dividend and Interest Income
Non-controlled/Affiliated Investments
Blackstone Donegal Holdings LP$5,790 $— $— $613 $— $6,403 $— 
Material Holdings, LLC— 21,384 — 163 — 21,547 1,378 
Material Holdings, LLC— 5,114 — (3,717)— 1,397 314 
Material+ Holding Company, LLC— — — — — — — 
Total$5,790 $26,498 $— $(2,941)$— $29,347 $1,692 
[23] Loan was on non-accrual status as of June 30, 2025.
[24] These loans are “last-out” portions of loans. The “last-out” portion of the Company’s loan investment generally earns a higher interest rate than the “first-out” portion, and in exchange the “first-out” portion would generally receive priority with respect to payment principal, interest and any other amounts due thereunder over the “last-out” portion.
[25] Loan was on non-accrual status as of December 31, 2024.
[26] These loans are “last-out” portions of loans. The “last-out” portion of the Company’s loan investment generally earns a higher interest rate than the “first-out” portion, and in exchange the “first-out” portion would generally receive priority with respect to payment principal, interest and any other amounts due thereunder over the “last-out” portion.
[27] The interest rate floor on these investments as of December 31, 2024 was 1.25%.
[28] The interest rate floor on these investments as of December 31, 2024 was 0.50%.
[29] The interest rate floor on these investments as of December 31, 2024 was 2.00%.
[30] For unsettled positions the interest rate does not include the base rate.
[31] The interest rate floor on these investments as of December 31, 2024 was 3.00%.
[32] The interest rate floor on these investments as of June 30, 2025 was 3.00%.