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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 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Foreign currency forward contracts        
Derivative [Line Items]        
Gains (losses) on foreign currency forward contracts $ 88 $ (380) $ 3,003 $ (1,429)