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Income Taxes - Provision (Benefit) for Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Income Tax Disclosure [Abstract]      
Current $ 176,537 $ 55,243 $ 102,391
Deferred (50,605) 30,239 (13,950)
Income taxes $ 125,932 $ 85,482 $ 88,441