Financial Highlights (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Investment Company, Financial Highlights [Roll Forward]
Net asset value at beginning of period (in dollars per share)	$ 23.56
Net asset value at end of period (in dollars per share)	$ 23.62	$ 23.23
Common shares outstanding at beginning of period (in shares)	64,896,000
Common shares outstanding at end of period (in shares)	84,898,000	21,242,000
Common Class I
Investment Company, Financial Highlights [Roll Forward]
Net asset value at beginning of period (in dollars per share)	$ 23.56	$ 23.47
Net investment income (in dollars per share)	0.47	0.54
Net unrealized appreciation (depreciation) (in dollars per share)	0.19	(0.15)
Net realized gains (losses) (in dollars per share)	0.01	(0.03)
Net increase (decrease) in net assets resulting from operations (in dollars per share)	0.67	0.36
Distributions of net investment income to shareholders (in dollars per share)	(0.4726)	(0.6000)
Distributions in excess of net investment income (in dollars per share)	(0.1374)	0
Net asset value at end of period (in dollars per share)	$ 23.62	$ 23.23
Total return	2.88%	1.55%
Common shares outstanding at beginning of period (in shares)	44,103,000	13,040,000
Common shares outstanding at end of period (in shares)	57,111,000	16,690,000
Net assets at beginning of period	$ 1,039,238	$ 305,989
Net assets at end of period	1,348,877	387,720
Average net assets	$ 1,244,421	$ 354,128
Ratio of net investment income to average net assets	2.01%	2.30%
Ratio of total expenses to average net assets	1.79%	1.58%
Ratio of net expenses to average net assets	1.84%	1.02%
Ratio of portfolio turnover to average investments at fair value	3.74%	7.24%
Weighted average outstanding debt	$ 734,946	$ 155,109
Average debt per share (in dollars per share)	$ 9.37	$ 8.13
Asset coverage ratio	317.80%	389.47%
Common Class S
Investment Company, Financial Highlights [Roll Forward]
Net asset value at beginning of period (in dollars per share)	$ 23.56	$ 23.47
Net investment income (in dollars per share)	0.42	0.49
Net unrealized appreciation (depreciation) (in dollars per share)	0.19	(0.15)
Net realized gains (losses) (in dollars per share)	0.01	(0.03)
Net increase (decrease) in net assets resulting from operations (in dollars per share)	0.62	0.31
Distributions of net investment income to shareholders (in dollars per share)	(0.4230)	(0.5503)
Distributions in excess of net investment income (in dollars per share)	(0.1370)	0
Net asset value at end of period (in dollars per share)	$ 23.62	$ 23.23
Total return	2.66%	1.33%
Common shares outstanding at beginning of period (in shares)	20,787,000	2,588,000
Common shares outstanding at end of period (in shares)	27,765,000	4,552,000
Net assets at beginning of period	$ 489,821	$ 60,738
Net assets at end of period	655,764	105,735
Average net assets	$ 605,418	$ 93,901
Ratio of net investment income to average net assets	1.80%	2.08%
Ratio of total expenses to average net assets	2.00%	1.79%
Ratio of net expenses to average net assets	2.06%	1.24%
Ratio of portfolio turnover to average investments at fair value	3.74%	7.24%
Weighted average outstanding debt	$ 734,946	$ 155,109
Average debt per share (in dollars per share)	$ 9.37	$ 8.13
Asset coverage ratio	317.80%	389.47%
Common Class D
Investment Company, Financial Highlights [Roll Forward]
Net asset value at beginning of period (in dollars per share)	$ 23.56
Net investment income (in dollars per share)	0.46
Net unrealized appreciation (depreciation) (in dollars per share)	0.19
Net realized gains (losses) (in dollars per share)	0.01
Net increase (decrease) in net assets resulting from operations (in dollars per share)	0.66
Distributions of net investment income to shareholders (in dollars per share)	(0.4590)
Distributions in excess of net investment income (in dollars per share)	(0.1363)
Net asset value at end of period (in dollars per share)	$ 23.62
Total return	2.82%
Common shares outstanding at beginning of period (in shares)	6,000
Common shares outstanding at end of period (in shares)	22,000
Net assets at beginning of period	$ 146
Net assets at end of period	530
Average net assets	$ 348
Ratio of net investment income to average net assets	1.95%
Ratio of total expenses to average net assets	1.85%
Ratio of net expenses to average net assets	1.91%
Ratio of portfolio turnover to average investments at fair value	3.74%
Weighted average outstanding debt	$ 734,946
Average debt per share (in dollars per share)	$ 9.37
Asset coverage ratio	317.80%