Derivatives - Summary of Average Outstanding Daily Volume for Forward Currency Contract (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Foreign exchange
Open Forward Foreign Currency Contract [Line Items]
Average U.S. Dollar notional outstanding	$ 404,826	$ 235,559	$ 293,420	$ 248,082