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Income Taxes - Schedule of Provision (Benefit) for Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Current      
Federal   $ (138)  
State $ 297 341 $ 465
Total current income tax provision (benefit) 297 203 465
Deferred      
Federal 8,404 13,238 (17,308)
State 830 2,265 (583)
Total deferred income tax provision (benefit) 9,234 15,503 (17,891)
Provision (Benefit) for income taxes $ 9,531 $ 15,706 $ (17,426)