BORROWINGS - Schedule of Notes (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Notes | January 2026 Notes
Debt Instrument [Line Items]
Interest expense and unused commitment fees	$ 1,575	$ 1,575
Amortization of deferred financing costs	84	84
Total interest and amortization of deferred financing costs	$ 1,659	$ 1,659
Weighted average effective interest rate	4.46%	4.46%
Average borrowings	$ 140,000	$ 140,000
Notes | October 2026 Notes
Debt Instrument [Line Items]
Interest expense and unused commitment fees	1,266	1,266
Amortization of deferred financing costs	192	185
Total interest and amortization of deferred financing costs	$ 1,458	$ 1,451
Weighted average effective interest rate	3.50%	3.50%
Average borrowings	$ 150,000	$ 150,000
Notes | August 2028 Notes
Debt Instrument [Line Items]
Interest expense and unused commitment fees	1,393	248
Amortization of deferred financing costs	127	41
Total interest and amortization of deferred financing costs	$ 1,520	$ 289
Weighted average effective interest rate	7.75%	7.75%
Average borrowings	$ 71,875	$ 71,785
Line of Credit | SPV Credit Facility | Secured Debt
Debt Instrument [Line Items]
Interest expense and unused commitment fees	1,216	0
Amortization of deferred financing costs	90	0
Total interest and amortization of deferred financing costs	$ 1,306	$ 0
Weighted average effective interest rate	7.92%	0.00%
Average borrowings	$ 46,275	$ 0