INCOME TAXES - Net Assets Resulting from Operations to Estimated RIC Taxable Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Income Tax Disclosure [Abstract]
Net increase in net assets from operations	$ 25,619	$ 22,684	$ 52,620	$ 36,719
Net unrealized depreciation on investments			22,029	13,727
Expense/loss recognized for tax on pass-through entities			0	(7)
Realized (gain) loss book/tax differences			(613)	11,333
Capital loss carryover			13,537	(1,864)
Net operating income - wholly-owned subsidiary			(24,404)	(2,008)
Dividend income from wholly-owned subsidiary			27,000	0
Non-deductible tax expense			1,487	542
Loss on extinguishment of debt			(1,363)	(1,363)
Non-deductible compensation			2,773	3,029
Compensation related book/tax differences			(2,387)	(6,184)
Interest on non-accrual loans			2,953	7,093
Other book/tax differences			(39)	303
Estimated distributable income before deductions for distributions			93,593	$ 61,320
Capital loss carryforwards	$ 144,300		$ 144,300