BORROWINGS - Notes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
January 2026 Notes | Notes
Debt Instrument [Line Items]
Interest expense	$ 0	$ 1,575	$ 0	$ 3,150
Amortization of deferred financing costs	0	84	0	168
Total interest and amortization of deferred financing costs	$ 0	$ 1,659	$ 0	$ 3,318
Weighted average interest rate	0.00%	4.46%	0.00%	4.46%
Average borrowings	$ 0	$ 140,000	$ 0	$ 140,000
October 2026 Notes | Notes
Debt Instrument [Line Items]
Interest expense	1,266	1,266	2,531	2,531
Amortization of deferred financing costs	192	192	385	385
Total interest and amortization of deferred financing costs	$ 1,458	$ 1,458	$ 2,916	$ 2,916
Weighted average interest rate	3.50%	3.50%	3.50%	3.50%
Average borrowings	$ 150,000	$ 150,000	$ 150,000	$ 150,000
August 2028 Notes | Notes
Debt Instrument [Line Items]
Interest expense	1,393	1,393	2,785	2,785
Amortization of deferred financing costs	126	127	252	255
Total interest and amortization of deferred financing costs	$ 1,519	$ 1,520	$ 3,037	$ 3,040
Weighted average interest rate	7.75%	7.75%	7.75%	7.75%
Average borrowings	$ 71,875	$ 71,875	$ 71,875	$ 71,875
2029 Convertible Notes | Convertible Debt
Debt Instrument [Line Items]
Interest expense	2,947	0	5,894	0
Amortization of deferred financing costs	370	0	740	0
Total interest and amortization of deferred financing costs	$ 3,317	$ 0	$ 6,634	$ 0
Weighted average interest rate	5.13%	0.00%	5.13%	0.00%
Average borrowings	$ 230,000	$ 0	$ 230,000	$ 0
September 2030 Notes | Notes
Debt Instrument [Line Items]
Interest expense	694	0	694	0
Amortization of deferred financing costs	42	0	42	0
Total interest and amortization of deferred financing costs	$ 736	$ 0	$ 736	$ 0
Weighted average interest rate	5.95%	0.00%	5.95%	0.00%
Average borrowings	$ 350,000	$ 0	$ 350,000	$ 0