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Income Taxes - Components of Income Taxes Provision (Benefit) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Current provision (benefit): |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | $ 7,933 | $ 8,055 | $ 2,321
Foreign |  |  |  |  |  |  |  |  | 516 |  |
State |  |  |  |  |  |  |  |  | 135 | 195 | (366)
Total current provision |  |  |  |  |  |  |  |  | 8,584 | 8,250 | 1,955
Deferred provision (benefit): |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | 2,285 | 4,205 | 10,190
State |  |  |  |  |  |  |  |  | 2,099 | 1,513 | 2,116
Total deferred provision |  |  |  |  |  |  |  |  | 4,384 | 5,718 | 12,306
Total income tax provision | $ 2,799 | $ 6,719 | $ 1,890 | $ 1,560 | $ 3,386 | $ 6,723 | $ 1,610 | $ 2,249 | $ 12,968 | $ 13,968 | $ 14,261

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