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Income Taxes - Schedule of Provision for Income Taxes (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Current |  |  |
State | $ 465 | $ 359 | $ 413
Total current income tax provision (benefit) | 465 | 359 | 413
Deferred |  |  |
Federal | (17,308) | 17,713 | 8,982
State | (583) | 2,802 | 531
Total deferred income tax provision (benefit) | (17,891) | 20,515 | 9,513
(Benefit) provision for income taxes | $ (17,426) | $ 20,874 | $ 9,926

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