v3.26.3
INVESTMENTS - Schedule of Investments (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
Sep. 30, 2026
Mar. 31, 2026
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   $ 2,410,129 [1],[2],[3],[4],[5] $ 2,097,446 [6],[7],[8],[9],[10]
Percentage of Net Assets at Fair Value   217.83% [1],[2],[4],[5] 207.46% [6],[8],[9],[10]
Cost   $ 2,459,088 [1],[2],[4],[5],[11] $ 2,119,485 [6],[8],[9],[10],[12]
Northeast      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   $ 699,561 $ 576,279
Percentage of Net Assets at Fair Value   63.20% 57.00%
Cost   $ 697,820 $ 579,895
West      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   $ 431,609 $ 446,244
Percentage of Net Assets at Fair Value   39.00% 44.10%
Cost   $ 437,785 $ 433,468
Southeast      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   $ 432,591 $ 421,730
Percentage of Net Assets at Fair Value   39.10% 41.80%
Cost   $ 475,861 $ 460,151
Southwest      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   $ 440,662 $ 358,529
Percentage of Net Assets at Fair Value   39.80% 35.50%
Cost   $ 439,563 $ 351,246
Midwest      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   $ 330,276 $ 262,879
Percentage of Net Assets at Fair Value   29.90% 26.00%
Cost   $ 334,019 $ 264,801
International      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   $ 39,064 $ 31,785
Percentage of Net Assets at Fair Value   3.50% 3.10%
Cost   $ 37,540 $ 29,924
JV equity      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   $ 36,366  
Percentage of Net Assets at Fair Value   3.30%  
Cost   $ 36,500  
Healthcare Services      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   $ 293,004 $ 287,375
Percentage of Net Assets at Fair Value   26.50% 28.40%
Cost   $ 325,092 $ 316,703
Media & Marketing      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   $ 212,576 $ 199,723
Percentage of Net Assets at Fair Value   19.20% 19.80%
Cost   $ 213,016 $ 198,800
Consumer Services      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   $ 230,982 $ 198,692
Percentage of Net Assets at Fair Value   20.90% 19.70%
Cost   $ 249,649 $ 210,318
Consumer Products      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   $ 230,095 $ 192,024
Percentage of Net Assets at Fair Value   20.80% 19.00%
Cost   $ 217,675 $ 184,982
Food, Agriculture & Beverage      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   $ 139,774 $ 135,389
Percentage of Net Assets at Fair Value   12.60% 13.40%
Cost   $ 150,531 $ 146,503
Transportation & Logistics      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   $ 123,450 $ 127,208
Percentage of Net Assets at Fair Value   11.20% 12.60%
Cost   $ 100,588 $ 94,012
Business Services      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   $ 99,852 $ 92,635
Percentage of Net Assets at Fair Value   9.00% 9.20%
Cost   $ 103,933 $ 97,504
Research & Consulting Services      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   $ 92,038 $ 87,119
Percentage of Net Assets at Fair Value   8.30% 8.60%
Cost   $ 92,028 $ 86,466
Commercial Services & Supplies      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   $ 78,963 $ 55,289
Percentage of Net Assets at Fair Value   7.10% 5.40%
Cost   $ 77,682 $ 54,524
Financial Services      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   $ 123,015 $ 81,007
Percentage of Net Assets at Fair Value   11.10% 8.00%
Cost   $ 114,749 $ 71,424
Industrial Machinery      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   $ 68,994 $ 70,559
Percentage of Net Assets at Fair Value   6.20% 7.00%
Cost   $ 74,327 $ 74,479
Industrial Products      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   $ 28,344 $ 55,961
Percentage of Net Assets at Fair Value   2.60% 5.50%
Cost   $ 17,958 $ 43,912
Software      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   $ 95,604 $ 34,892
Percentage of Net Assets at Fair Value   8.60% 3.40%
Cost   $ 94,477 $ 34,514
Pharmaceuticals, Biotechnology & Life Sciences      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   $ 51,347 $ 51,813
Percentage of Net Assets at Fair Value   4.60% 5.10%
Cost   $ 55,009 $ 55,055
Environmental Services      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   $ 59,696 $ 47,438
Percentage of Net Assets at Fair Value   5.40% 4.70%
Cost   $ 64,263 $ 50,394
Industrial Services      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   $ 60,594 $ 55,311
Percentage of Net Assets at Fair Value   5.50% 5.50%
Cost   $ 59,896 $ 54,576
Healthcare Equipment & Supplies      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   $ 47,332 $ 47,519
Percentage of Net Assets at Fair Value   4.30% 4.70%
Cost   $ 49,597 $ 48,621
IT Services      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   $ 49,310 $ 20,943
Percentage of Net Assets at Fair Value   4.50% 2.10%
Cost   $ 49,033 $ 21,616
Telecommunications      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   $ 45,463 $ 46,094
Percentage of Net Assets at Fair Value   4.10% 4.60%
Cost   $ 50,877 $ 48,458
Specialty Retail      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   $ 33,398 $ 40,052
Percentage of Net Assets at Fair Value   3.00% 4.00%
Cost   $ 31,560 $ 38,175
Education      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   $ 30,627 $ 30,843
Percentage of Net Assets at Fair Value   2.80% 3.10%
Cost   $ 43,515 $ 42,240
Healthcare Products      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   $ 29,221 $ 36,248
Percentage of Net Assets at Fair Value   2.60% 3.60%
Cost   $ 29,649 $ 36,891
Restaurants      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   $ 28,625 $ 25,373
Percentage of Net Assets at Fair Value   2.60% 2.50%
Cost   $ 28,012 $ 25,638
Energy Services      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   $ 22,438 $ 22,173
Percentage of Net Assets at Fair Value   2.00% 2.20%
Cost   $ 22,199 $ 21,896
Aerospace & Defense      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   $ 28,214  
Percentage of Net Assets at Fair Value   2.70%  
Cost   $ 28,214  
JV equity      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   $ 36,366  
Percentage of Net Assets at Fair Value   3.30%  
Cost   $ 36,500  
Movies & Entertainment      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   $ 18,095 $ 22,711
Percentage of Net Assets at Fair Value   1.60% 2.20%
Cost   $ 25,543 $ 25,454
Distribution      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   $ 37,938 $ 17,643
Percentage of Net Assets at Fair Value   3.40% 1.70%
Cost   $ 33,772 $ 13,505
Technology Products & Components      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   $ 10,015 $ 8,443
Percentage of Net Assets at Fair Value   0.90% 0.80%
Cost   $ 9,957 $ 12,878
Building & Infrastructure Products      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   $ 4,759 $ 6,969
Percentage of Net Assets at Fair Value   0.40% 0.70%
Cost   $ 9,787 $ 9,947
First Lien Loans, Last Out      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   146,200 23,500
First Lien Loans, Split Lien Term Loans      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   80,400 55,900
Second Lien Loans, Split Lien Term Loans      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   25,100 24,900
Unsecured Convertible Notes      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   $ 200 $ 200
Percentage of Total Portfolio at Fair Value | Investment Type      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value   100.00% 100.00%
Percentage of Total Portfolio at Fair Value | Investment Type | First Lien Loans, Last Out      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value   6.10% 1.10%
Percentage of Total Portfolio at Fair Value | Investment Type | First Lien Loans, Split Lien Term Loans      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value   3.30% 2.70%
Percentage of Total Portfolio at Fair Value | Investment Type | Second Lien Loans, Split Lien Term Loans      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value   1.00% 1.20%
Percentage of Total Portfolio at Fair Value | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 100.00%    
Percentage of Total Portfolio at Fair Value | Industry | Industry Sectors      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value   100.00%  
Percentage of Total Portfolio at Fair Value | Industry | Healthcare Services      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 13.70% 12.10%  
Percentage of Total Portfolio at Fair Value | Industry | Media & Marketing      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 9.50% 8.80%  
Percentage of Total Portfolio at Fair Value | Industry | Consumer Services      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 9.50% 9.60%  
Percentage of Total Portfolio at Fair Value | Industry | Consumer Products      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 9.20% 9.50%  
Percentage of Total Portfolio at Fair Value | Industry | Food, Agriculture & Beverage      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 6.40% 5.80%  
Percentage of Total Portfolio at Fair Value | Industry | Transportation & Logistics      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 6.00% 5.10%  
Percentage of Total Portfolio at Fair Value | Industry | Business Services      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 4.40% 4.10%  
Percentage of Total Portfolio at Fair Value | Industry | Research & Consulting Services      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 4.20% 3.80%  
Percentage of Total Portfolio at Fair Value | Industry | Commercial Services & Supplies      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 2.60% 3.30%  
Percentage of Total Portfolio at Fair Value | Industry | Financial Services      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 3.90% 5.10%  
Percentage of Total Portfolio at Fair Value | Industry | Industrial Machinery      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 3.40% 2.90%  
Percentage of Total Portfolio at Fair Value | Industry | Industrial Products      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 2.70% 1.20%  
Percentage of Total Portfolio at Fair Value | Industry | Software      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 1.70% 4.00%  
Percentage of Total Portfolio at Fair Value | Industry | Pharmaceuticals, Biotechnology & Life Sciences      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 2.50% 2.10%  
Percentage of Total Portfolio at Fair Value | Industry | Environmental Services      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 2.30% 2.50%  
Percentage of Total Portfolio at Fair Value | Industry | Industrial Services      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 2.60% 2.50%  
Percentage of Total Portfolio at Fair Value | Industry | Healthcare Equipment & Supplies      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 2.30% 2.00%  
Percentage of Total Portfolio at Fair Value | Industry | IT Services      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 1.00% 2.00%  
Percentage of Total Portfolio at Fair Value | Industry | Telecommunications      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 2.20% 1.90%  
Percentage of Total Portfolio at Fair Value | Industry | Specialty Retail      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 1.90% 1.40%  
Percentage of Total Portfolio at Fair Value | Industry | Education      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 1.50% 1.30%  
Percentage of Total Portfolio at Fair Value | Industry | Healthcare Products      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 1.70% 1.20%  
Percentage of Total Portfolio at Fair Value | Industry | Restaurants      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 1.20% 1.20%  
Percentage of Total Portfolio at Fair Value | Industry | Energy Services      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 1.00% 0.90%  
Percentage of Total Portfolio at Fair Value | Industry | Aerospace & Defense      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value   1.20%  
Percentage of Total Portfolio at Fair Value | Industry | JV equity      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value   1.50%  
Percentage of Total Portfolio at Fair Value | Industry | Movies & Entertainment      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 1.10% 0.80%  
Percentage of Total Portfolio at Fair Value | Industry | Distribution      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 0.80% 1.60%  
Percentage of Total Portfolio at Fair Value | Industry | Technology Products & Components      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 0.40% 0.40%  
Percentage of Total Portfolio at Fair Value | Industry | Building & Infrastructure Products      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 0.30% 0.20%  
Percentage of Total Portfolio at Fair Value | Geographic      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value   100.00% 100.00%
Percentage of Total Portfolio at Fair Value | Geographic | Northeast      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value   29.00% 27.50%
Percentage of Total Portfolio at Fair Value | Geographic | West      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value   17.90% 21.30%
Percentage of Total Portfolio at Fair Value | Geographic | Southeast      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value   18.00% 20.10%
Percentage of Total Portfolio at Fair Value | Geographic | Southwest      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value   18.30% 17.10%
Percentage of Total Portfolio at Fair Value | Geographic | Midwest      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value   13.70% 12.50%
Percentage of Total Portfolio at Fair Value | Geographic | International      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value   1.60% 1.50%
Percentage of Total Portfolio at Fair Value | Geographic | JV equity      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value   1.50%  
Percentage of Total Portfolio at Cost | Investment Type      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value   100.00% 100.00%
Percentage of Total Portfolio at Cost | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 100.00%    
Percentage of Total Portfolio at Cost | Industry | Industry Sectors      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value   100.00%  
Percentage of Total Portfolio at Cost | Industry | Healthcare Services      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 14.90% 13.20%  
Percentage of Total Portfolio at Cost | Industry | Media & Marketing      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 9.40% 8.70%  
Percentage of Total Portfolio at Cost | Industry | Consumer Services      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 9.90% 10.30%  
Percentage of Total Portfolio at Cost | Industry | Consumer Products      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 8.70% 8.90%  
Percentage of Total Portfolio at Cost | Industry | Food, Agriculture & Beverage      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 6.90% 6.10%  
Percentage of Total Portfolio at Cost | Industry | Transportation & Logistics      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 4.40% 4.10%  
Percentage of Total Portfolio at Cost | Industry | Business Services      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 4.60% 4.20%  
Percentage of Total Portfolio at Cost | Industry | Research & Consulting Services      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 4.10% 3.70%  
Percentage of Total Portfolio at Cost | Industry | Commercial Services & Supplies      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 2.60% 3.20%  
Percentage of Total Portfolio at Cost | Industry | Financial Services      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 3.40% 4.70%  
Percentage of Total Portfolio at Cost | Industry | Industrial Machinery      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 3.50% 3.00%  
Percentage of Total Portfolio at Cost | Industry | Industrial Products      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 2.10% 0.70%  
Percentage of Total Portfolio at Cost | Industry | Software      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 1.60% 3.80%  
Percentage of Total Portfolio at Cost | Industry | Pharmaceuticals, Biotechnology & Life Sciences      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 2.60% 2.20%  
Percentage of Total Portfolio at Cost | Industry | Environmental Services      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 2.40% 2.60%  
Percentage of Total Portfolio at Cost | Industry | Industrial Services      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 2.60% 2.40%  
Percentage of Total Portfolio at Cost | Industry | Healthcare Equipment & Supplies      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 2.30% 2.00%  
Percentage of Total Portfolio at Cost | Industry | IT Services      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 1.00% 2.00%  
Percentage of Total Portfolio at Cost | Industry | Telecommunications      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 2.30% 2.10%  
Percentage of Total Portfolio at Cost | Industry | Specialty Retail      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 1.80% 1.30%  
Percentage of Total Portfolio at Cost | Industry | Education      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 2.00% 1.80%  
Percentage of Total Portfolio at Cost | Industry | Healthcare Products      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 1.70% 1.20%  
Percentage of Total Portfolio at Cost | Industry | Restaurants      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 1.20% 1.10%  
Percentage of Total Portfolio at Cost | Industry | Energy Services      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 1.00% 0.90%  
Percentage of Total Portfolio at Cost | Industry | Aerospace & Defense      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value   1.10%  
Percentage of Total Portfolio at Cost | Industry | JV equity      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value   1.50%  
Percentage of Total Portfolio at Cost | Industry | Movies & Entertainment      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 1.20% 1.00%  
Percentage of Total Portfolio at Cost | Industry | Distribution      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 0.60% 1.40%  
Percentage of Total Portfolio at Cost | Industry | Technology Products & Components      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 0.70% 0.40%  
Percentage of Total Portfolio at Cost | Industry | Building & Infrastructure Products      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value 0.50% 0.40%  
Percentage of Total Portfolio at Cost | Geographic      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value   100.00% 100.00%
Percentage of Total Portfolio at Cost | Geographic | Northeast      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value   28.40% 27.40%
Percentage of Total Portfolio at Cost | Geographic | West      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value   17.80% 20.40%
Percentage of Total Portfolio at Cost | Geographic | Southeast      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value   19.30% 21.70%
Percentage of Total Portfolio at Cost | Geographic | Southwest      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value   17.90% 16.60%
Percentage of Total Portfolio at Cost | Geographic | Midwest      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value   13.60% 12.50%
Percentage of Total Portfolio at Cost | Geographic | International      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value   1.50% 1.40%
Percentage of Total Portfolio at Cost | Geographic | JV equity      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value   1.50%  
First lien loans      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   $ 2,155,196 $ 1,890,406
Percentage of Net Assets at Fair Value   194.80% 187.00%
Cost   $ 2,234,534 $ 1,948,890
First lien loans | Percentage of Total Portfolio at Fair Value | Investment Type      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value   89.40% 90.10%
First lien loans | Percentage of Total Portfolio at Cost | Investment Type      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value   90.90% 92.00%
Second lien loans      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   $ 25,098 $ 24,931
Percentage of Net Assets at Fair Value   2.20% 2.50%
Cost   $ 26,029 $ 26,064
Second lien loans | Percentage of Total Portfolio at Fair Value | Investment Type      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value   1.00% 1.20%
Second lien loans | Percentage of Total Portfolio at Cost | Investment Type      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value   1.00% 1.20%
Subordinated debt      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   $ 1,214 $ 1,157
Percentage of Net Assets at Fair Value   0.10% 0.10%
Cost   $ 1,386 $ 1,337
Subordinated debt | Percentage of Total Portfolio at Fair Value | Investment Type      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value   0.10% 0.10%
Subordinated debt | Percentage of Total Portfolio at Cost | Investment Type      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value   0.10% 0.10%
Preferred equity      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   $ 83,488 $ 74,638
Percentage of Net Assets at Fair Value   7.50% 7.40%
Cost   $ 89,037 $ 82,020
Preferred equity | Percentage of Total Portfolio at Fair Value | Investment Type      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value   3.50% 3.50%
Preferred equity | Percentage of Total Portfolio at Cost | Investment Type      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value   3.60% 3.80%
Common equity & warrants      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   $ 106,876 $ 102,276
Percentage of Net Assets at Fair Value   9.70% 10.10%
Cost   $ 70,542 $ 57,717
Common equity & warrants | Percentage of Total Portfolio at Fair Value | Investment Type      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value   4.40% 4.90%
Common equity & warrants | Percentage of Total Portfolio at Cost | Investment Type      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value   2.90% 2.70%
Earnout      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value   $ 1,891 $ 4,038
Percentage of Net Assets at Fair Value   0.20% 0.40%
Cost   $ 1,060 $ 3,457
Earnout | Percentage of Total Portfolio at Fair Value | Investment Type      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value   0.10% 0.20%
Earnout | Percentage of Total Portfolio at Cost | Investment Type      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value   0.00% 0.20%
Joint Venture ("JV") Equity      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value [1],[2],[3],[4],[5]   $ 36,366  
Percentage of Net Assets at Fair Value [1],[2],[4],[5]   3.29%  
Cost [1],[2],[4],[5],[11]   $ 36,500  
Joint Venture ("JV") Equity | Percentage of Total Portfolio at Fair Value | Investment Type      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value   1.50%  
Joint Venture ("JV") Equity | Percentage of Total Portfolio at Cost | Investment Type      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio at Fair Value   1.50%  
[1] All debt investments are income-producing, unless otherwise noted. Equity investments are non-income producing, unless otherwise noted.
[2] Non-Control/Non-Affiliate investments are generally defined by the 1940 Act as investments that are neither control investments nor affiliate investments. Investments are classified as non-control/non-affiliate investments, unless otherwise noted. At September 30, 2026, the Company held $1,951.3 million of non-control/non-affiliate investments (at fair value), which represented approximately 81.0% of the Company’s total investments. The fair value of these investments as a percent of net assets is 176.3%.
[3] The Company's investment portfolio is comprised entirely of debt and equity securities, along with other financial instruments, of privately held companies for which quoted prices falling within the categories of Level 1 and Level 2 inputs are not readily available. Therefore, the Company values all of its portfolio investments at fair value, as determined in good faith by the valuation committee comprised of certain officers of the Company (the "Valuation Committee") as the valuation designee of the Board of Directors (the "Valuation Designee") pursuant to Rule 2a-5 under the Investment Company Act of 1940, as amended (the “1940 Act”), using significant unobservable Level 3 inputs. Refer to Note 4 - Fair Value Measurements for further discussion.
[4] Equity ownership may be held in shares or units of a company that is either wholly owned by the portfolio company or under common control by the same parent company to the portfolio company.
[5] Unless otherwise noted, all portfolio company headquarters are based in the United States.
[6] Non-Control/Non-Affiliate investments are generally defined by the 1940 Act as investments that are neither control investments nor affiliate investments. Investments are classified as non-control/non-affiliate investments, unless otherwise noted. At March 31, 2026, the Company held $1,682.4 million of non-control/non-affiliate investments, which represented approximately 80.2% of the Company’s investment assets. The fair value of these investments as a percent of net assets is 166.5%.
[7] The Company's investment portfolio is comprised entirely of debt and equity securities, along with other financial instruments, of privately held companies for which quoted prices falling within the categories of Level 1 and Level 2 inputs are not readily available. Therefore, the Company values all of its portfolio investments at fair value, as determined in good faith by the valuation committee comprised of certain officers of the Company (the "Valuation Committee") as the valuation designee of the Board of Directors (the "Valuation Designee") pursuant to Rule 2a-5 under the Investment Company Act of 1940, as amended (the “1940 Act”), using significant unobservable Level 3 inputs. Refer to Note 4 - Fair Value Measurements for further discussion.
[8] Equity ownership may be held in shares or units of a company that is either wholly owned by the portfolio company or under common control by the same parent company to the portfolio company.
[9] Unless otherwise noted, all portfolio company headquarters are based in the United States.
[10] All debt investments are income-producing, unless otherwise noted. Equity investments are non-income producing, unless otherwise noted.
[11] As of September 30, 2026, the cumulative gross unrealized appreciation for U.S. federal income tax purposes was approximately $106.1 million; cumulative gross unrealized depreciation for federal income tax purposes was $166.8 million. Cumulative net unrealized depreciation was $60.7 million, based on a tax cost of $2,470.9 million.
[12] As of March 31, 2026, the cumulative gross unrealized appreciation for U.S. federal income tax purposes was approximately $109.0 million; cumulative gross unrealized depreciation for federal income tax purposes was $133.8 million. Cumulative net unrealized depreciation was $24.8 million, based on a tax cost of $2,122.3 million.