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Stock Award Plans - Nonvested Stock Options (Details) - $ / shares
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Options Outstanding      
Outstanding at beginning of period (in shares) 1,210,689 293,167 0
Granted (in shares) 0 1,043,349 356,343
Vested (in shares) 0 0 0
Forfeited (in shares) (179,555) (125,827) (63,176)
Outstanding at end of period (in shares) 1,031,134 1,210,689 293,167
Weighted Average Grant Date Fair Value      
Outstanding at beginning of period (in dollars per share) $ 4.38 $ 5.33 $ 0
Granted (in dollars per share) 0 4.17 5.33
Vested (in dollars per share) 0 0 0
Forfeited (in dollars per share) 4.31 4.83 5.33
Outstanding at end of period (in dollars per share) $ 4.39 $ 4.38 $ 5.33