Consolidated Statements of Changes in Net Assets (unaudited) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended		8 Months Ended
	Mar. 31, 2025	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025
Investment Company, Net Assets [Roll Forward]
Beginning balance (in shares)				264,277,128
Beginning balance		$ 4,017,544	$ 2,563,918	$ 4,014,529	$ 2,547,878
Issuance of common stock		37,434		$ 37,434
Repurchases of common stock, net of commission costs (in shares)	(77,777)			(77,777)	0	(409,705)
Repurchases of common stock, net of commission costs	$ (1,130)	(1,130)		$ (1,130)		$ (5,938)
Net increase (decrease) in net assets resulting from operations
Net investment income after taxes		98,662	86,533	195,252	$ 170,068
Net realized gain (loss) on investment transactions		(11,041)	(13,818)	(38,896)	(12,722)
Net realized gain (loss) on extinguishment of debt				(48)
Net change in unrealized appreciation (depreciation) on investment transactions		(8,783)	20,493	33,792	11,661
(Provision) benefit for taxes on unrealized appreciation on investments		146	350	198	327
Distributions to stockholders:
Stock issued in connection with dividend reinvestment plan		15,150	14,634	33,704	29,520
Distributions from distributable earnings		(104,484)	(78,470)	(231,337)	(153,092)
Total increase (decrease) common stock, outstanding		$ 25,954	$ 29,722	$ 28,969	$ 45,762
Ending balance (in shares)	268,831,114	268,831,114	171,517,307	268,831,114	171,517,307	268,831,114
Ending balance	$ 4,043,498	$ 4,043,498	$ 2,593,640	$ 4,043,498	$ 2,593,640	$ 4,043,498
Common Stock
Investment Company, Net Assets [Roll Forward]
Beginning balance (in shares)		265,498,597	170,585,795	264,277,128	169,594,742
Beginning balance		$ 265	$ 171	$ 264	$ 170
Issuance of common stock (in shares)		2,408,940		2,408,940
Issuance of common stock		$ 3		$ 3
Repurchases of common stock, net of commission costs (in shares)		(77,777)		(77,777)
Distributions to stockholders:
Stock issued in connection with dividend reinvestment plan (in shares)		1,001,354	931,512	2,222,823	1,922,565
Stock issued in connection with dividend reinvestment plan		$ 1	$ 1	$ 2	$ 2
Total increase (decrease) common stock, outstanding (in shares)		3,332,517	931,512	4,553,986	1,922,565
Total increase (decrease) common stock, outstanding		$ 4	$ 1	$ 5	$ 2
Ending balance (in shares)	268,831,114	268,831,114	171,517,307	268,831,114	171,517,307	268,831,114
Ending balance	$ 269	$ 269	$ 172	$ 269	$ 172	$ 269
Paid in Capital in Excess of Par
Investment Company, Net Assets [Roll Forward]
Beginning balance		4,185,811	2,661,797	4,167,258	2,646,912
Issuance of common stock		37,431		37,431
Repurchases of common stock, net of commission costs		(1,130)		(1,130)
Distributions to stockholders:
Stock issued in connection with dividend reinvestment plan		15,149	14,633	33,702	29,518
Total increase (decrease) common stock, outstanding		51,450	14,633	70,003	29,518
Ending balance	4,237,261	4,237,261	2,676,430	4,237,261	2,676,430	4,237,261
Distributable Earnings (Losses)
Investment Company, Net Assets [Roll Forward]
Beginning balance		(168,532)	(98,050)	(152,993)	(99,204)
Net increase (decrease) in net assets resulting from operations
Net investment income after taxes		98,662	86,533	195,252	170,068
Net realized gain (loss) on investment transactions		(11,041)	(13,818)	(38,896)	(12,722)
Net realized gain (loss) on extinguishment of debt				(48)
Net change in unrealized appreciation (depreciation) on investment transactions		(8,783)	20,493	33,792	11,661
(Provision) benefit for taxes on unrealized appreciation on investments		146	350	198	327
Distributions to stockholders:
Distributions from distributable earnings		(104,484)	(78,470)	(231,337)	(153,092)
Total increase (decrease) common stock, outstanding		(25,500)	15,088	(41,039)	16,242
Ending balance	$ (194,032)	$ (194,032)	$ (82,962)	$ (194,032)	$ (82,962)	$ (194,032)