Forward Currency Contracts - Schedule of Forward Currency Contract, Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Sep. 30, 2021
Open Forward Foreign Currency Contract [Line Items]
Unrealized appreciation on forward currency contracts	$ 32,333	$ 2,716
Net amounts presented in the Consolidated Statement of Financial Condition	32,333	90
Foreign exchange
Open Forward Foreign Currency Contract [Line Items]
Unrealized appreciation on forward currency contracts	32,333	2,716
Unrealized depreciation on forward currency contracts	0	(2,626)
Net amounts presented in the Consolidated Statement of Financial Condition	32,333	90
Collateral (received) pledged	0	0
Net amount	$ 32,333	$ 90