Financial Instruments - Additional Information (Details) - USD ($)	Mar. 31, 2022	Sep. 30, 2021
Foreign exchange forward contracts | Cash flow hedge | Designated as hedging instrument
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Aggregate notional amount	$ 68,000,000	$ 107,000,000
Foreign currency option contracts, purchase risk
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Aggregate notional amount	13,000,000	49,000,000
Foreign currency option contracts, translation risk
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Aggregate notional amount	$ 0	$ 0