Forward Currency Contracts - Schedule of Forward Currency Contract, Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Sep. 30, 2022
Open Forward Foreign Currency Contract [Line Items]
Unrealized appreciation on forward currency contracts	$ 15,745	$ 32,333
Net amounts presented in the Consolidated Statement of Financial Condition	15,438	32,333
Foreign exchange
Open Forward Foreign Currency Contract [Line Items]
Unrealized appreciation on forward currency contracts	15,745	32,333
Unrealized depreciation on forward currency contracts	(307)	0
Net amounts presented in the Consolidated Statement of Financial Condition	15,438	32,333
Collateral (received) pledged	0	0
Net amount	$ 15,438	$ 32,333

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