Derivative Financial Instruments - Schedule of Notional Amounts of Outstanding Forward Contracts (Details) - Forward Contracts - Designated as Hedging Instrument - Net Investment Hedging - USD ($) $ in Thousands	Mar. 31, 2024	Sep. 30, 2023
Derivative [Line Items]
Notional amount	$ 379,786	$ 348,208
Euro / U.S. Dollar
Derivative [Line Items]
Notional amount	369,697	337,923
Japanese Yen / U.S. Dollar
Derivative [Line Items]
Notional amount	$ 10,089	$ 10,285