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Derivative Financial Instruments - Additional Information (Details) - USD ($)
$ in Millions
6 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Derivative [Line Items]    
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Net $ (1.9) $ (1.1)
Maximum | Forward contracts | Not Designated as Hedging Instrument    
Derivative [Line Items]    
Derivative, remaining maturity 3 months  
Maximum | Forward contracts | Designated as Hedging Instrument | Net Investment Hedging    
Derivative [Line Items]    
Derivative, remaining maturity 3 months  
Maximum | Foreign Exchange Options | Not Designated as Hedging Instrument    
Derivative [Line Items]    
Derivative, remaining maturity 14 months