BORROWINGS - Schedule of Notes (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Debt Instrument [Line Items]
Total interest and amortization of deferred financing costs	$ 43,088	$ 28,873	$ 19,924
Notes | January 2026 Notes
Debt Instrument [Line Items]
Interest expense and unused commitment fees	6,300	6,300	6,300
Amortization of deferred financing costs	337	344	361
Total interest and amortization of deferred financing costs	$ 6,637	$ 6,644	$ 6,661
Weighted average effective interest rate	4.46%	4.46%	4.46%
Average borrowings	$ 140,000	$ 140,000	$ 140,000
Notes | October 2026 Notes
Debt Instrument [Line Items]
Interest expense and unused commitment fees	5,062	5,062	2,658
Amortization of deferred financing costs	814	734	435
Total interest and amortization of deferred financing costs	$ 5,876	$ 5,796	$ 3,093
Weighted average effective interest rate	3.50%	3.50%	3.50%
Average borrowings	$ 150,000	$ 150,000	$ 132,900
Notes | August 2028 Notes
Debt Instrument [Line Items]
Interest expense and unused commitment fees	4,425	0	0
Amortization of deferred financing costs	423	0	0
Total interest and amortization of deferred financing costs	$ 4,848	$ 0	$ 0
Weighted average effective interest rate	7.75%	0.00%	0.00%
Average borrowings	$ 71,875	$ 0	$ 0