Consolidated Statements of Changes in Net Assets - USD ($) $ in Thousands	1 Months Ended		3 Months Ended
	Jan. 31, 2023	Jan. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Investment Company, Net Assets [Roll Forward]
Beginning balance	$ 4,158,966	$ 4,447,479	$ 4,158,966	$ 4,447,479
Issuance of common shares, net of offering and underwriting costs			0	0
Reinvestment of dividends	5,132	11,469	5,132	11,469
Net investment income			149,175	102,703
Net realized gain (loss) on investments			4,167	5,949
Net change in unrealized appreciation (depreciation) on investments			(14,544)	(1,412)
Dividends declared and payable from net investment income			(112,400)	(132,318)
Ending balance			4,190,496	4,433,870
Par Amount
Investment Company, Net Assets [Roll Forward]
Beginning balance	160	169	160	169
Reinvestment of dividends			2	1
Ending balance			162	170
Additional Paid in Capital
Investment Company, Net Assets [Roll Forward]
Beginning balance	4,033,113	4,245,125	4,033,113	4,245,125
Reinvestment of dividends			5,130	11,468
Ending balance			4,038,243	4,256,593
Distributable Earnings (Loss)
Investment Company, Net Assets [Roll Forward]
Beginning balance	$ 125,693	$ 202,185	125,693	202,185
Net investment income			149,175	102,703
Net realized gain (loss) on investments			4,167	5,949
Net change in unrealized appreciation (depreciation) on investments			(14,544)	(1,412)
Dividends declared and payable from net investment income			(112,400)	(132,318)
Ending balance			$ 152,091	$ 177,107