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Income Taxes - Components of Income Taxes Provision (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Current provision:      
Federal $ 38,028 $ 17,654 $ 7,933
Foreign 1,516 654 516
State 6,527 1,365 135
Total current provision 46,071 19,673 8,584
Deferred provision:      
Federal 4,201 2,262 2,285
State 543 871 2,099
Total deferred provision 4,744 3,133 4,384
Total income tax provision $ 50,815 $ 22,806 $ 12,968