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Income Taxes - Provision (Benefit) for Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Income Tax Disclosure [Abstract]      
Current $ 102,197 $ 176,537 $ 55,243
Deferred (3,292) (50,605) 30,239
Income taxes $ 98,905 $ 125,932 $ 85,482