BORROWINGS - Notes (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
January 2026 Notes | Notes
Debt Instrument [Line Items]
Interest expense	$ 4,358	$ 6,300	$ 6,300
Amortization of deferred financing costs	224	337	344
Total interest and amortization of deferred financing costs	$ 4,582	$ 6,637	$ 6,644
Weighted average interest rate	4.46%	4.46%	4.46%
Average borrowings	$ 140,000	$ 140,000	$ 140,000
October 2026 Notes | Notes
Debt Instrument [Line Items]
Interest expense	5,062	5,062	5,062
Amortization of deferred financing costs	770	814	734
Total interest and amortization of deferred financing costs	$ 5,832	$ 5,876	$ 5,796
Weighted average interest rate	3.50%	3.50%	3.50%
Average borrowings	$ 150,000	$ 150,000	$ 150,000
August 2028 Notes | Notes
Debt Instrument [Line Items]
Interest expense	5,570	4,425	0
Amortization of deferred financing costs	501	423	0
Total interest and amortization of deferred financing costs	$ 6,071	$ 4,848	$ 0
Weighted average interest rate	7.75%	7.75%	0.00%
Average borrowings	$ 71,875	$ 71,875	$ 0
2029 Convertible Notes | Convertible Debt
Debt Instrument [Line Items]
Interest expense	4,650	0	0
Amortization of deferred financing costs	613	0	0
Total interest and amortization of deferred financing costs	$ 5,263	$ 0	$ 0
Weighted average interest rate	5.13%	0.00%	0.00%
Average borrowings	$ 230,000	$ 0	$ 0