Derivatives - Summary of Average Outstanding Daily Volume for Forward Currency Contract (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Foreign exchange
Open Forward Foreign Currency Contract [Line Items]
Average U.S. Dollar notional outstanding	$ 442,838	$ 204,449	$ 343,044	$ 233,538