Derivatives - Schedule of Average Outstanding Daily Volume for Forward Currency Contracts (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Forward currency contracts
Open Forward Foreign Currency Contract [Line Items]
Average U.S. Dollar notional outstanding	$ 412,621	$ 296,011	$ 314,603	$ 324,980

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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+ Details