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Income Taxes - Schedule of Provision for Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Current      
Federal $ (39)   $ (138)
State 202 $ 297 341
Total current income tax provision 163 297 203
Deferred      
Federal 4,494 8,404 13,238
State 1,171 830 2,265
Total deferred income tax provision 5,665 9,234 15,503
Provision for income taxes $ 5,828 $ 9,531 $ 15,706