COMMITMENTS AND CONTINGENCIES - Unused Commitments (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Mar. 31, 2024
Other Commitments [Line Items]
Total Unfunded Debt Commitments	$ 132,740	$ 139,591
Unfunded Equity Commitments
Other Commitments [Line Items]
Total Unfunded Debt Commitments	536	537
Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	99,758	112,404
Delayed Draw Term Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	32,925	27,187
Other
Other Commitments [Line Items]
Total Unfunded Debt Commitments	57	0
Investment, Identifier [Axis]: AAC New Holdco Inc., Delayed Draw Term Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	196	0
Investment, Identifier [Axis]: ATS Operating, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	1,189	1,640
Investment, Identifier [Axis]: Acacia BuyerCo V LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	2,000	2,000
Investment, Identifier [Axis]: Acceleration, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	0	5,000
Investment, Identifier [Axis]: Air Conditioning Specialist Inc., Delayed Draw Term Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	750	750
Investment, Identifier [Axis]: Air Conditioning Specialist, Inc., Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	1,675	1,675
Investment, Identifier [Axis]: Apple Roofing Administrative Services, LLC (fka Roof OpCo, LLC), Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	3,056	3,056
Investment, Identifier [Axis]: ArborWorks, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	307	432
Investment, Identifier [Axis]: BP Loenbro Holdings Inc., Delayed Draw Term Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	1,101	1,101
Investment, Identifier [Axis]: BP Loenbro Holdings Inc., Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	440	1,101
Investment, Identifier [Axis]: Bond Brand Loyalty ULC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	2,000	2,000
Investment, Identifier [Axis]: Brandner Design, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	1,000	0
Investment, Identifier [Axis]: Broad Sky Networks, LLC ,Other
Other Commitments [Line Items]
Total Unfunded Debt Commitments	57	0
Investment, Identifier [Axis]: Burning Glass Intermediate Holding Company, Inc., Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	296	296
Investment, Identifier [Axis]: CDC Dental Management Co., LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	2,000	2,000
Investment, Identifier [Axis]: Campany Roof Maintenance, LLC, Delayed Draw Term Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	6,014	0
Investment, Identifier [Axis]: Campany Roof Maintenance, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	1,064	0
Investment, Identifier [Axis]: Catbird NYC, LLC, Other
Other Commitments [Line Items]
Total Unfunded Debt Commitments	125	125
Investment, Identifier [Axis]: Catbird NYC, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	2,500	4,000
Investment, Identifier [Axis]: Cavalier Buyer, Inc., Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	2,000	2,000
Investment, Identifier [Axis]: Central Medical Supply LLC, Delayed Draw Term Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	1,400	1,400
Investment, Identifier [Axis]: Central Medical Supply LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	1,300	800
Investment, Identifier [Axis]: CityVet, Inc., Delayed Draw Term Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	9,000	5,000
Investment, Identifier [Axis]: Damotech Inc., Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	3,000	3,000
Investment, Identifier [Axis]: Edge Autonomy Holdings, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	4,000	4,000
Investment, Identifier [Axis]: Exact Borrower, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	2,500	2,500
Investment, Identifier [Axis]: FS Vector LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	2,000	2,000
Investment, Identifier [Axis]: GPT Industries, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	3,000	3,000
Investment, Identifier [Axis]: Gains Intermediate, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	2,500	2,500
Investment, Identifier [Axis]: GrammaTech, Inc., Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	2,500	2,500
Investment, Identifier [Axis]: Gulf Pacific Acquisition, LLC, Delayed Draw Term Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	0	1,212
Investment, Identifier [Axis]: Gulf Pacific Acquisition, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	303	555
Investment, Identifier [Axis]: HH-Inspire Acquisition, Inc., Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	46	46
Investment, Identifier [Axis]: ISI Enterprises, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	2,000	2,000
Investment, Identifier [Axis]: ITA Holdings Group, LLC, Delayed Draw Term Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	0	854
Investment, Identifier [Axis]: ITA Holdings Group, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	0	1,058
Investment, Identifier [Axis]: Ignite Visibility LLC, Delayed Draw Term Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	0	2,000
Investment, Identifier [Axis]: Ignite Visibility LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	2,000	2,000
Investment, Identifier [Axis]: Infolinks Media Buyco, LLC, Other
Other Commitments [Line Items]
Total Unfunded Debt Commitments	411	412
Investment, Identifier [Axis]: Institutes of Health, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	1,000	1,000
Investment, Identifier [Axis]: Island Pump and Tank, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	3,479	1,500
Investment, Identifier [Axis]: LEHR Upfitters, LLC, Delayed Draw Term Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	5,247	0
Investment, Identifier [Axis]: LEHR Upfitters, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	1,749	0
Investment, Identifier [Axis]: LGM Pharma LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	1,500	1,500
Investment, Identifier [Axis]: LKC Technologies, Inc., Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	2,000	2,000
Investment, Identifier [Axis]: Lab Logistics, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	40	0
Investment, Identifier [Axis]: Lighting Retrofit International, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	1,354	1,354
Investment, Identifier [Axis]: Lightning Intermediate II, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	1,852	1,852
Investment, Identifier [Axis]: Mako Steel LP, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	1,887	1,887
Investment, Identifier [Axis]: Mammoth BorrowCo, Inc., Delayed Draw Term Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	0	1,325
Investment, Identifier [Axis]: Mammoth BorrowCo, Inc., Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	500	1,950
Investment, Identifier [Axis]: Microbe Formulas LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	1,627	1,627
Investment, Identifier [Axis]: NeuroPsychiatric Hospitals, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	1,000	0
Investment, Identifier [Axis]: New Skinny Mixes, LLC, Delayed Draw Term Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	0	3,000
Investment, Identifier [Axis]: New Skinny Mixes, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	3,000	3,500
Investment, Identifier [Axis]: NinjaTrader, Inc., Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	2,500	2,500
Investment, Identifier [Axis]: One Group, LLC, Delayed Draw Term Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	545	545
Investment, Identifier [Axis]: Opco Borrower, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	0	833
Investment, Identifier [Axis]: Outerbox, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	0	2,000
Investment, Identifier [Axis]: Pipeline Technique Ltd., Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	944	2,278
Investment, Identifier [Axis]: Pool Service Holdings, LLC, Delayed Draw Term Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	2,500	5,000
Investment, Identifier [Axis]: Pool Service Holdings, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	1,000	0
Investment, Identifier [Axis]: RTIC Subsidiary Holdings LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	0	301
Investment, Identifier [Axis]: Revo Brands, Inc., Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	2,800	7,000
Investment, Identifier [Axis]: Roseland Management, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	2,000	2,000
Investment, Identifier [Axis]: South Coast Terminals LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	0	1,935
Investment, Identifier [Axis]: Spotlight AR, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	2,000	2,000
Investment, Identifier [Axis]: SureKap, LLC, Delayed Draw Term Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	1,172	0
Investment, Identifier [Axis]: Swensons Drive-In Restaurants, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	1,500	1,500
Investment, Identifier [Axis]: TMT BHC Buyer, Inc., Delayed Draw Term Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	5,000	5,000
Investment, Identifier [Axis]: TMT BHC Buyer, Inc., Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	4,717	4,717
Investment, Identifier [Axis]: Tru Fragrance & Beauty LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	3,000	3,900
Investment, Identifier [Axis]: Versicare Management LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	1,800	2,500
Investment, Identifier [Axis]: Wall Street Prep, Inc., Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	1,000	1,000
Investment, Identifier [Axis]: Well-Foam, Inc., Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	4,500	4,500
Investment, Identifier [Axis]: Winter Services Operations, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	5,333	3,111
Investment, Identifier [Axis]: Zenfolio Inc., Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	$ 1,000	$ 1,000