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Derivative Financial Instruments - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Derivative Instruments, Gain (Loss) [Line Item]      
Maximum amount of loss due to credit risk $ 33,700    
Maximum length of time hedged in cash flow hedges 3 years    
Changes in fair value of cash flow hedges, net of tax $ 31,386 $ 14,917 $ (32,655)
Typical maturity period of other risk management derivatives not designated as hedging Instruments less than 12 months    
Foreign Exchange Contracts [Member]      
Derivative Instruments, Gain (Loss) [Line Item]      
Net unrealized (losses) gains from cash flow hedges recognized in other comprehensive (loss) income $ 34,529 15,646 (35,654)
Changes in fair value of cash flow hedges, net of tax 31,386 $ 14,917 $ (32,655)
Foreign currency cash flow hedge, reclassified into earnings during fiscal year 2026 $ 23,152