INCOME TAXES - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	Dec. 31, 2024	Mar. 31, 2024
Income Tax Contingency [Line Items]
Undistributed ordinary income - tax basis	$ 33,900
Cumulative undistributed taxable income (in usd per share)	$ 0.68
Cost of investments	$ 1,727,200	$ 1,471,100
Gross unrealized appreciation	114,300	96,300
Gross unrealized depreciation	140,200	96,400
Net unrealized appreciation (depreciation)	(25,900)	100
Total net deferred tax (liabilities) assets	(15,629)	$ (11,997)
RIC
Income Tax Contingency [Line Items]
Cost of investments	1,672,200
Gross unrealized appreciation	15,100
Gross unrealized depreciation	126,900
Net unrealized appreciation (depreciation)	(111,800)
Taxable Subsidiary
Income Tax Contingency [Line Items]
Cost of investments	55,000
Gross unrealized appreciation	99,200
Gross unrealized depreciation	13,300
Net unrealized appreciation (depreciation)	$ 85,900