BORROWINGS - Schedule of Borrowings Outstanding (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Mar. 31, 2022
Debt Instrument [Line Items]
Outstanding Balance	$ 619,000	$ 535,000
Unamortized Debt Issuance Costs and Debt Discount/Premium	(7,373)	(6,412)
Recorded Value	611,627	528,588
Line of Credit | Credit Facility
Debt Instrument [Line Items]
Outstanding Balance	225,000
Unamortized Debt Issuance Costs and Debt Discount/Premium	0
Recorded Value	225,000
SBA Debentures | Unsecured Debt
Debt Instrument [Line Items]
Outstanding Balance	104,000	40,000
Unamortized Debt Issuance Costs and Debt Discount/Premium	(3,418)	(1,648)
Recorded Value	100,582	38,352
Credit Facility | Line of Credit
Debt Instrument [Line Items]
Outstanding Balance		205,000
Unamortized Debt Issuance Costs and Debt Discount/Premium		0
Recorded Value		205,000
January 2026 Notes | Notes
Debt Instrument [Line Items]
Outstanding Balance	140,000	140,000
Unamortized Debt Issuance Costs and Debt Discount/Premium	(1,033)	(1,286)
Recorded Value	138,967	138,714
October 2026 Notes | Notes
Debt Instrument [Line Items]
Outstanding Balance	150,000	150,000
Unamortized Debt Issuance Costs and Debt Discount/Premium	(2,922)	(3,478)
Recorded Value	$ 147,078	$ 146,522