v3.26.1
Commitments and Contingencies - Schedule of Unfunded Commitments by Investment (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Sep. 30, 2025
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments $ 235,375 $ 286,047
Investment, Identifier [Axis]: 107-109 Beech OAK22 LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 0 13,567
Investment, Identifier [Axis]: ASP Integrity Acquisition Co LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 3,025 5,042
Investment, Identifier [Axis]: ASP-R-PAC Acquisition Co LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 0 287
Investment, Identifier [Axis]: AVSC Holding Corp.    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 3,251 5,539
Investment, Identifier [Axis]: All Web Leads, Inc.    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 0 360
Investment, Identifier [Axis]: Aquestive Therapeutics, Inc.    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 5,184 0
Investment, Identifier [Axis]: BAART Programs, Inc.    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 3 0
Investment, Identifier [Axis]: Bamboo IDE8 Insurance Services, LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 1,577 0
Investment, Identifier [Axis]: Bayou Intermediate II, LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 1,772 5,509
Investment, Identifier [Axis]: Berner Food & Beverage, LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 952 1,998
Investment, Identifier [Axis]: BioXcel Therapeutics, Inc.    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 0 7,506
Investment, Identifier [Axis]: CIELO BIDCO LIMITED    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 399 1,555
Investment, Identifier [Axis]: Centralsquare Technologies, LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 1,404 1,404
Investment, Identifier [Axis]: Chase Industries, Inc.    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 1,002 0
Investment, Identifier [Axis]: Coupa Holdings, LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 300 2,075
Investment, Identifier [Axis]: Creek Parent, Inc.    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 5,459 6,855
Investment, Identifier [Axis]: Crewline Buyer, Inc.    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 2,180 2,180
Investment, Identifier [Axis]: Dialyze Holdings, LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 1,232 1,232
Investment, Identifier [Axis]: Digital.AI Software Holdings, Inc.    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 5,441 5,238
Investment, Identifier [Axis]: Draken International, LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 2,001 5,873
Investment, Identifier [Axis]: EMPIRE BIDCO AB    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 10,630 10,609
Investment, Identifier [Axis]: Enverus Holdings, Inc.    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 5,571 2,140
Investment, Identifier [Axis]: Everbridge, Inc.    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 5,043 5,043
Investment, Identifier [Axis]: Evergreen IX Borrower 2023, LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 1,626 1,626
Investment, Identifier [Axis]: Eyesouth Eye Care Holdco LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 4 2,817
Investment, Identifier [Axis]: F&M Buyer LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 3,212 3,212
Investment, Identifier [Axis]: Galileo Parent, Inc.    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 0 1,596
Investment, Identifier [Axis]: Grand River Aseptic Manufacturing, Inc.    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 2,594 2,594
Investment, Identifier [Axis]: Grove Hotel Parcel Owner, LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 881 1,762
Investment, Identifier [Axis]: IDF 14 FinanceCo, LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 5,093 0
Investment, Identifier [Axis]: Icefall Parent, Inc.    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 1,765 1,765
Investment, Identifier [Axis]: Integrity Marketing Acquisition, LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 8,248 8,870
Investment, Identifier [Axis]: Inventus Power, Inc.    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 2,016 2,907
Investment, Identifier [Axis]: Jeppesen Holdings, LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 726 0
Investment, Identifier [Axis]: Kings Buyer, LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 2,148 5,821
Investment, Identifier [Axis]: Kite Midco II Inc.    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 2,374 2,374
Investment, Identifier [Axis]: LDS Buyer, LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 1,875 1,908
Investment, Identifier [Axis]: LSL Holdco, LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 742 848
Investment, Identifier [Axis]: Legends Hospitality Holding Company, LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 1,769 2,909
Investment, Identifier [Axis]: Lightbox Intermediate, L.P.    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 1,237 1,268
Investment, Identifier [Axis]: London Buyer, LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 4,566 0
Investment, Identifier [Axis]: MHE Intermediate Holdings, LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 714 1,071
Investment, Identifier [Axis]: MRI Software LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 3,410 4,092
Investment, Identifier [Axis]: MRO Florida, Inc.    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 605 0
Investment, Identifier [Axis]: Mindbody, Inc.    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 0 4,027
Investment, Identifier [Axis]: Minotaur Acquisition, Inc.    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 706 1,882
Investment, Identifier [Axis]: Monotype Imaging Holdings Inc.    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 4,803 7,176
Investment, Identifier [Axis]: NFO Orange Buyer LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 3,319 0
Investment, Identifier [Axis]: Nellson Nutraceutical, LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 1,728 2,241
Investment, Identifier [Axis]: Next Holdco, LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 1,924 7,051
Investment, Identifier [Axis]: OCSI Glick JV LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 13,998 13,998
Investment, Identifier [Axis]: Optimizely North America Inc.    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 1,694 1,694
Investment, Identifier [Axis]: PAI Financing Merger Sub LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 5,210 5,210
Investment, Identifier [Axis]: PPW Aero Buyer, Inc.    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 10,428 13,574
Investment, Identifier [Axis]: PetVet Care Centers, LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 4,806 13,732
Investment, Identifier [Axis]: Pike Corporation    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 7,144 0
Investment, Identifier [Axis]: Pluralsight, LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 8,688 8,688
Investment, Identifier [Axis]: Poseidon Midco AB    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 2,833 8,144
Investment, Identifier [Axis]: Premium Parent, LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 3,021 0
Investment, Identifier [Axis]: Protein For Pets Opco, LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 2,117 1,545
Investment, Identifier [Axis]: Resistance Holdings, Inc.    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 1,095 0
Investment, Identifier [Axis]: SIO2 Medical Products, Inc.    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 722 238
Investment, Identifier [Axis]: Senior Loan Fund JV I, LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 13,125 13,125
Investment, Identifier [Axis]: Sierra Enterprises, LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 1,424 1,424
Investment, Identifier [Axis]: Silk Holdings III LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 751 0
Investment, Identifier [Axis]: Sorenson Communications, LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 5,409 5,409
Investment, Identifier [Axis]: Spanx, LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 0 2,267
Investment, Identifier [Axis]: Spruce Bidco I Inc.    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 5,666 9,271
Investment, Identifier [Axis]: SumUp Holdings Luxembourg    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 0 5,101
Investment, Identifier [Axis]: TBRS, Inc.    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 4,151 4,209
Investment, Identifier [Axis]: Telestream 2 LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 745 745
Investment, Identifier [Axis]: Tequilas Premium, Inc.    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 3,054 0
Investment, Identifier [Axis]: Thrive Bidco Limited    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 4,458 0
Investment, Identifier [Axis]: Truck-Lite Co., LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 9,115 10,259
Investment, Identifier [Axis]: USIC Holdings, Inc.    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 447 1,812
Investment, Identifier [Axis]: Verona Pharma, Inc.    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 0 4,568
Investment, Identifier [Axis]: WP CPP Holdings, LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 3,272 3,272
Investment, Identifier [Axis]: Whitney Merger Sub, Inc.    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 2,388 2,388
Investment, Identifier [Axis]: eShipping, LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 3,573 0
Investment, Identifier [Axis]: iCIMs, Inc.    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments $ 1,530 $ 1,545