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Derivative Financial Instruments - Gains (Losses) on Derivative Financial Instruments Recorded in Consolidated Statements of Income (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Foreign currency forward contracts        
Derivative [Line Items]        
Gains (losses) on foreign currency forward contracts $ 502 $ (180) $ (882) $ 361