Derivative Financial Instruments - Additional Information (Details) - Maximum	9 Months Ended
	Jun. 30, 2021
Forward Contracts | Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative maturity	3 months
Forward Contracts | Designated as Hedging Instrument | Net Investment Hedging
Derivative [Line Items]
Derivative maturity	3 months
Foreign Exchange Options | Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative maturity	10 months