Consolidated Statements of Changes in Net Assets - USD ($) $ in Thousands	3 Months Ended						6 Months Ended		9 Months Ended
	Jun. 30, 2026	Mar. 31, 2026	Dec. 31, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2026	Mar. 31, 2025	Jun. 30, 2026	Jun. 30, 2025	May 31, 2026	Apr. 30, 2026	Feb. 28, 2026	Jan. 31, 2026	Nov. 30, 2025	Oct. 31, 2025	Sep. 30, 2025	May 31, 2025	Apr. 30, 2025	Feb. 28, 2025	Jan. 31, 2025	Nov. 30, 2024	Oct. 31, 2024	Sep. 30, 2024
Operations:
Net investment income	$ 91,244	$ 96,312	$ 102,293	$ 82,956	$ 77,254	$ 72,205			$ 289,849	$ 232,415
Net unrealized appreciation (depreciation)	2,075			16,793					(108,081)	(13,157)
Net realized gains (losses)	(9,864)			(15,991)					(31,351)	(5,774)
Provision for income tax (expense) benefit	(28)	78	(87)	(3)	19	(65)			(37)	(49)
Net increase (decrease) in net assets resulting from operations	83,427			83,755					150,380	213,435
Distributions to common shareholders:
Net decrease in net assets resulting from distributions	(92,988)			(107,821)					(307,815)	(281,845)
Share transactions:
Issuance of Common shares in private and public offering	61,014	139,605	315,482	612,027	399,629	251,493
Issuance of Common shares under distribution reinvestment plan	21,213	25,600	29,550	26,795	25,204	23,524			76,363	75,523
Repurchased shares, net of early repurchase deduction	(197,691)	(310,398)	(191,101)	(175,010)	(21,923)	(20,909)
Total increase (decrease) in net assets	(125,025)			439,746					(264,161)	1,052,420
Net assets at beginning of period	4,402,669	4,663,563	4,541,805	3,777,014	3,412,316	3,164,340	$ 4,541,805	$ 3,164,340	4,541,805	3,164,340
Net assets at end of period	$ 4,277,644	$ 4,402,669	$ 4,663,563	$ 4,216,760	$ 3,777,014	$ 3,412,316	$ 4,402,669	$ 3,777,014	$ 4,277,644	$ 4,216,760
Net asset value per common share (in dollars per share)	$ 22.32			$ 23.14					$ 22.32	$ 23.14							$ 23.09
Common shares outstanding at end of period (in shares)	191,612,000			182,204,000					191,612,000	182,204,000							196,721,000
Class I shares
Distributions to common shareholders:
Net decrease in net assets resulting from distributions	$ (69,128)			$ (77,672)					$ (227,122)	$ (197,850)
Share transactions:
Issuance of Common shares in private and public offering	44,048			540,559					412,982	1,015,107
Share transfers between classes	1,680			644					4,702	1,700
Issuance of Common shares under distribution reinvestment plan	8,068			12,033					34,001	33,561
Repurchased shares, net of early repurchase deduction	(163,770)			(156,200)					(495,789)	(179,433)
Net increase (decrease) from share transactions	$ (109,974)			$ 397,036					$ (44,104)	$ 870,935
Net asset value per common share (in dollars per share)	$ 22.32	$ 22.38	$ 22.93	$ 23.14	$ 23.28	$ 23.52	$ 22.38	$ 23.28	$ 22.32	$ 23.14	$ 22.41	$ 22.39	$ 22.64	$ 22.87	$ 22.95	$ 22.98	$ 23.09	$ 23.16	$ 23.12	$ 23.41	$ 23.49	$ 23.56	$ 23.55	$ 23.56
Common shares outstanding at end of period (in shares)	137,453,000	142,336,000		127,124,000	110,042,000		142,336,000	110,042,000	137,453,000	127,124,000							139,709,000							89,884,000
Class S shares
Distributions to common shareholders:
Net decrease in net assets resulting from distributions	$ (23,578)			$ (30,056)					$ (79,889)	$ (83,766)
Share transactions:
Issuance of Common shares in private and public offering	15,717			71,458					93,683	246,239
Share transfers between classes	(1,642)			(644)					(4,581)	(1,700)
Issuance of Common shares under distribution reinvestment plan	13,096			14,735					42,226	41,881
Repurchased shares, net of early repurchase deduction	(33,921)			(18,810)					(203,281)	(38,332)
Net increase (decrease) from share transactions	$ (6,750)			$ 66,739					$ (71,953)	$ 248,088
Net asset value per common share (in dollars per share)	$ 22.32	$ 22.38	22.93	$ 23.14	$ 23.28	23.52	$ 22.38	$ 23.28	$ 22.32	$ 23.14	22.41	22.39	22.64	22.87	22.95	22.98	$ 23.09	23.16	23.12	23.41	23.49	23.56	23.55	$ 23.56
Common shares outstanding at end of period (in shares)	53,523,000	53,807,000		54,922,000	52,027,000		53,807,000	52,027,000	53,523,000	54,922,000							56,785,000							44,323,000
Class D shares
Distributions to common shareholders:
Net decrease in net assets resulting from distributions	$ (186)			$ (93)					$ (564)	$ (229)
Share transactions:
Issuance of Common shares in private and public offering	0			10					5,336	1,803
Share transfers between classes	(38)			0					(121)	0
Issuance of Common shares under distribution reinvestment plan	23			27					63	81
Repurchased shares, net of early repurchase deduction	0			0					(120)	(77)
Net increase (decrease) from share transactions	$ (15)			$ 37					$ 5,158	$ 1,807
Net asset value per common share (in dollars per share)	$ 22.32	$ 22.38	22.93	$ 23.14	$ 23.28	23.52	$ 22.38	$ 23.28	$ 22.32	$ 23.14	22.41	22.39	22.64	22.87	22.95	22.98	$ 23.09	23.16	23.12	23.41	23.49	23.56	23.55	$ 23.56
Common shares outstanding at end of period (in shares)	400,000	400,000		158,000	157,000		400,000	157,000	400,000	158,000							174,000							81,000
Class T shares
Distributions to common shareholders:
Net decrease in net assets resulting from distributions	$ (96)			$ 0					$ (240)	$ 0
Share transactions:
Issuance of Common shares in private and public offering	1,249			0					4,100	0
Issuance of Common shares under distribution reinvestment plan	26			0					73	0
Net increase (decrease) from share transactions	$ 1,275			$ 0					$ 4,173	$ 0
Net asset value per common share (in dollars per share)	$ 22.32	$ 22.38	$ 22.93	$ 0	$ 0	$ 0	$ 22.38	$ 0	$ 22.32	$ 0	$ 22.41	$ 22.39	$ 22.64	$ 22.87	$ 22.95	$ 22.98	$ 23.09	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0
Common shares outstanding at end of period (in shares)	236,000	179,000					179,000		236,000								53,000