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Income Taxes - Provision (Benefit) for Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Income Tax Disclosure [Abstract]      
Current $ 153,611 $ 102,197 $ 176,537
Deferred (60,212) (3,292) (50,605)
Income taxes $ 93,399 $ 98,905 $ 125,932