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Income Taxes - Provision for Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Current:      
Federal $ 7,138 $ 20,020 $ 29,644
State 2,584 7,302 9,403
Deferred:      
Federal 1,252 (28) 15,043
State 578 26 4,772
Total $ 11,552 $ 27,320 $ 58,862