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Income Taxes - Schedule of Provision (Benefit) for Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Current      
Federal $ (138)    
State 341 $ 465 $ 359
Total current income tax provision (benefit) 203 465 359
Deferred      
Federal 13,238 (17,308) 17,713
State 2,265 (583) 2,802
Total deferred income tax provision (benefit) 15,503 (17,891) 20,515
Provision (Benefit) for income taxes $ 15,706 $ (17,426) $ 20,874