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Income Taxes - Summary of Income Before Income Tax Provision (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Income before income tax provision:      
United States $ 254,052 $ 202,643 $ 94,854
Other 7,869 3,151 2,586
Income before income tax provision $ 261,921 $ 205,794 $ 97,440