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Income Taxes - Components of Income Taxes Provision (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Current provision:                      
Federal                 $ 17,654 $ 7,933 $ 8,055
Foreign                 654 516  
State                 1,365 135 195
Total current provision                 19,673 8,584 8,250
Deferred provision:                      
Federal                 2,262 2,285 4,205
State                 871 2,099 1,513
Total deferred provision                 3,133 4,384 5,718
Total income tax provision $ 6,384 $ 11,555 $ 1,638 $ 3,229 $ 2,799 $ 6,719 $ 1,890 $ 1,560 $ 22,806 $ 12,968 $ 13,968