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Stock Award Plans - Nonvested Stock Options (Details) - $ / shares
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Options Outstanding      
Outstanding at beginning of period (in shares) 1,031,134 1,210,689 293,167
Granted (in shares) 352,043 0 1,043,349
Vested (in shares) (223,387) 0 0
Forfeited (in shares) (178,380) (179,555) (125,827)
Outstanding at end of period (in shares) 981,410 1,031,134 1,210,689
Weighted Average Grant Date Fair Value      
Outstanding at beginning of period (in dollars per share) $ 4.39 $ 4.38 $ 5.33
Granted (in dollars per share) 7.18 0 4.17
Vested (in dollars per share) 5.32 0 0
Forfeited (in dollars per share) 5.02 4.31 4.83
Outstanding at end of period (in dollars per share) $ 5.07 $ 4.39 $ 4.38