Taxable/Distributable Income - Reconciliation of Net Increase (Decrease) in Net Assets Resulting from Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Net increase (decrease) in net assets resulting from operations	$ 52,934	$ 6,544
Net unrealized (appreciation) depreciation	(16,919)	2,842
Book/tax difference due to capital gains incentive fees	2,141	0
Other book/tax differences	(4,535)	(422)
Taxable income	$ 33,621	$ 8,964