COMMITMENTS AND CONTINGENCIES - Unused Commitments (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Other Commitments [Line Items]
Total Unfunded Debt Commitments	$ 139,591	$ 124,637
Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	112,404	87,554
Delayed Draw Term Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	27,187	37,083
Total Unfunded Equity Commitments
Other Commitments [Line Items]
Total Unfunded Debt Commitments	537	537
Investment, Identifier [Axis]: AAC New Holdco Inc., Delayed Draw Term Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	0	199
Investment, Identifier [Axis]: ATS Operating, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	1,640	2,000
Investment, Identifier [Axis]: Acacia BuyerCo V LLC, Delayed Draw Term Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	0	2,500
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, Delayed Draw Term Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	0	5,000
Investment, Identifier [Axis]: Acceleration, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	5,000	1,300
Investment, Identifier [Axis]: Air Conditioning Specialist Inc., Delayed Draw Term Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	750	0
Investment, Identifier [Axis]: Air Conditioning Specialist, Inc., Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	1,675	1,200
Investment, Identifier [Axis]: American Teleconferencing Services, Ltd., Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	0	154
Investment, Identifier [Axis]: ArborWorks, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	432	1,000
Investment, Identifier [Axis]: BP Loenbro Holdings Inc., Delayed Draw Term Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	1,101	0
Investment, Identifier [Axis]: BP Loenbro Holdings Inc., Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	1,101	0
Investment, Identifier [Axis]: Bond Brand Loyalty ULC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	2,000	0
Investment, Identifier [Axis]: Burning Glass Intermediate Holding Company, Inc., Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	296	0
Investment, Identifier [Axis]: CDC Dental Management Co., LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	2,000	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	4,000	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	800	1,200
Investment, Identifier [Axis]: CityVet, Inc., Delayed Draw Term Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	5,000	0
Investment, Identifier [Axis]: Damotech Inc., Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	3,000	0
Investment, Identifier [Axis]: Edge Autonomy Holdings, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	4,000	0
Investment, Identifier [Axis]: Exact Borrower, LLC, Delayed Draw Term Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	0	2,500
Investment, Identifier [Axis]: Exact Borrower, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	2,500	2,500
Investment, Identifier [Axis]: FM Sylvan, Inc., Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	0	8,000
Investment, Identifier [Axis]: FS Vector LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	2,000	0
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, Delayed Draw Term Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	0	5,000
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	1,212	1,212
Investment, Identifier [Axis]: Gulf Pacific Acquisition, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	555	657
Investment, Identifier [Axis]: HH-Inspire Acquisition, Inc., Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	46	0
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	854	0
Investment, Identifier [Axis]: ITA Holdings Group, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	1,058	0
Investment, Identifier [Axis]: Ignite Visibility LLC, Delayed Draw Term Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	2,000	0
Investment, Identifier [Axis]: Ignite Visibility LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	2,000	0
Investment, Identifier [Axis]: Infolinks Media Buyco, LLC, Delayed Draw Term Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	0	2,250
Investment, Identifier [Axis]: Infolinks Media Buyco, LLC, Other
Other Commitments [Line Items]
Total Unfunded Debt Commitments	412	412
Investment, Identifier [Axis]: Institutes of Health, LLC., Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	1,000	0
Investment, Identifier [Axis]: Island Pump and Tank, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	1,500	1,000
Investment, Identifier [Axis]: KMS, LLC, Delayed Draw Term Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	0	2,286
Investment, Identifier [Axis]: LGM Pharma LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	1,500	0
Investment, Identifier [Axis]: LKC Technologies, Inc., Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	2,000	0
Investment, Identifier [Axis]: Lash OpCo, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	0	138
Investment, Identifier [Axis]: Lighting Retrofit International, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	1,354	2,083
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	943
Investment, Identifier [Axis]: Mammoth BorrowCo, Inc., Delayed Draw Term Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	1,325	0
Investment, Identifier [Axis]: Mammoth BorrowCo, Inc., Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	1,950	0
Investment, Identifier [Axis]: Microbe Formulas LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	1,627	1,627
Investment, Identifier [Axis]: Muenster Milling Company, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	0	7,000
Investment, Identifier [Axis]: NWN Parent Holdings, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	0	480
Investment, Identifier [Axis]: New Skinny Mixes, LLC, Delayed Draw Term Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	3,000	3,000
Investment, Identifier [Axis]: New Skinny Mixes, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	3,500	4,000
Investment, Identifier [Axis]: NinjaTrader, Inc., Delayed Draw Term Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	0	4,692
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	0
Investment, Identifier [Axis]: Opco Borrower, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	833	833
Investment, Identifier [Axis]: Outerbox, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	2,000	2,000
Investment, Identifier [Axis]: Pipeline Technique Ltd., Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	2,278	2,833
Investment, Identifier [Axis]: Pool Service Holdings, LLC, Delayed Draw Term Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	5,000	0
Investment, Identifier [Axis]: RTIC Subsidiary Holdings LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	301	548
Investment, Identifier [Axis]: Revo Brands, Inc., Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	7,000	0
Investment, Identifier [Axis]: Roof OpCo, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	3,056	3,056
Investment, Identifier [Axis]: Roseland Management, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	2,000	1,425
Investment, Identifier [Axis]: Shearwater Research, Inc., Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	0	2,446
Investment, Identifier [Axis]: South Coast Terminals LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	1,935	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]: Swensons Drive-In Restaurants, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	1,500	0
Investment, Identifier [Axis]: Systec Corporation, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	0	400
Investment, Identifier [Axis]: TMT BHC Buyer, Inc., Delayed Draw Term Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	5,000	0
Investment, Identifier [Axis]: TMT BHC Buyer, Inc., Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	4,717	0
Investment, Identifier [Axis]: Tru Fragrance & Beauty LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	3,900	0
Investment, Identifier [Axis]: Versicare Management LLC, Delayed Draw Term Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	0	2,600
Investment, Identifier [Axis]: Versicare Management LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	2,500	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, Delayed Draw Term Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	0	4,444
Investment, Identifier [Axis]: Winter Services Operations, LLC, Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	3,111	$ 4,444
Investment, Identifier [Axis]: Zenfolio Inc., Revolving Loans
Other Commitments [Line Items]
Total Unfunded Debt Commitments	$ 1,000		$ 0