Forward Currency Contracts - Schedule of Realized and Unrealized Gain (Loss) on Forward Currency Contract (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Open Forward Foreign Currency Contract [Line Items]
Realized gain (loss) on forward currency contracts recognized in income	$ 708	$ 0	$ 1,171	$ 0
Change in unrealized appreciation (depreciation) on forward currency contracts recognized in income	(2,447)		(16,895)	2,137
Foreign exchange
Open Forward Foreign Currency Contract [Line Items]
Realized gain (loss) on forward currency contracts recognized in income	708	0	1,171	0
Change in unrealized appreciation (depreciation) on forward currency contracts recognized in income	$ (2,447)	$ 1,856	$ (16,895)	$ 2,137