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INCOME TAXES - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
	Aug. 27, 2026	Sep. 30, 2026	Jun. 30, 2026	Mar. 31, 2026
Income Tax Contingency [Line Items]
Dividends		$ 41,400	$ 39,600	$ 38,500
Cost of investments		2,470,900		2,122,300
Gross unrealized appreciation		106,100		109,000
Gross unrealized depreciation		(166,800)		(133,800)
Net unrealized appreciation (depreciation)		(60,700)		(24,800)
Deferred tax liabilities		(11,792)		$ (12,507)
RIC
Income Tax Contingency [Line Items]
Cost of investments		2,377,200
Gross unrealized appreciation		22,000
Gross unrealized depreciation		(153,100)
Net unrealized appreciation (depreciation)		(131,100)
Taxable Subsidiary
Income Tax Contingency [Line Items]
Cost of investments		93,700
Gross unrealized appreciation		84,100
Gross unrealized depreciation		(13,700)
Net unrealized appreciation (depreciation)		$ 70,400
Regular Dividends
Income Tax Contingency [Line Items]
Dividends declared (in usd per share)				$ 0.58
O 2026 M1 Tax Year Dividends
Income Tax Contingency [Line Items]
Dividends declared (in usd per share)				0.1934
O 2026 M2 Tax Year Dividends
Income Tax Contingency [Line Items]
Dividends declared (in usd per share)				0.1934
O 2026 M3 Tax Year Dividends
Income Tax Contingency [Line Items]
Dividends declared (in usd per share)				0.1934
S 2026 Q4 Dividends
Income Tax Contingency [Line Items]
Dividends declared (in usd per share)				$ 0.06
O 2027 Q1 Dividends
Income Tax Contingency [Line Items]
Dividends declared (in usd per share)			$ 0.58
O 2027 M4 Tax Year Dividends
Income Tax Contingency [Line Items]
Dividends declared (in usd per share)			0.1934
O 2027 M5 Tax Year Dividends
Income Tax Contingency [Line Items]
Dividends declared (in usd per share)			0.1934
O 2027 M6 Tax Year Dividends
Income Tax Contingency [Line Items]
Dividends declared (in usd per share)			0.1934
S 2027 Q1 Dividends
Income Tax Contingency [Line Items]
Dividends declared (in usd per share)			$ 0.06
O 2027 Q2 Dividends
Income Tax Contingency [Line Items]
Dividends declared (in usd per share)		$ 0.58
O 2027 M7 Tax Year Dividends
Income Tax Contingency [Line Items]
Dividends declared (in usd per share)		0.1934
O 2027 M8 Tax Year Dividends
Income Tax Contingency [Line Items]
Dividends declared (in usd per share)		0.1934
O 2027 M9 Tax Year Dividends
Income Tax Contingency [Line Items]
Dividends declared (in usd per share)		0.1934
S 2027 Q2 Dividends
Income Tax Contingency [Line Items]
Dividends declared (in usd per share)		$ 0.06
O 2027 M10 Tax Year Dividends
Income Tax Contingency [Line Items]
Dividends declared (in usd per share)	$ 0.1934
O 2027 M11 Tax Year Dividends
Income Tax Contingency [Line Items]
Dividends declared (in usd per share)	0.1934
O 2027 M12 Tax Year Dividends
Income Tax Contingency [Line Items]
Dividends declared (in usd per share)	0.1934
O 2027 Q3 Dividends
Income Tax Contingency [Line Items]
Dividends declared (in usd per share)	0.58
S 2027 Q3 Dividends
Income Tax Contingency [Line Items]
Dividends declared (in usd per share)	$ 0.06