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Income Taxes - Components of Income Taxes Provision (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Current provision:      
Federal $ 49,380 $ 38,028 $ 17,654
Foreign 1,739 1,516 654
State 11,004 6,527 1,365
Total current provision 62,123 46,071 19,673
Deferred provision:      
Federal 1,650 4,201 2,262
State 159 543 871
Total deferred provision 1,809 4,744 3,133
Total income tax provision $ 63,932 $ 50,815 $ 22,806