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Stock Award Plans - Nonvested Stock Options (Details) - $ / shares
 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Options Outstanding      
Outstanding at beginning of period (in shares) 293,167 0 0
Granted (in shares) 1,043,349 356,343 0
Vested (in shares) 0 0 0
Forfeited (in shares) (125,827) (63,176) 0
Outstanding at end of period (in shares) 1,210,689 293,167 0
Weighted Average Grant Date Fair Value      
Outstanding at beginning of period (in dollars per share) $ 5.33 $ 0 $ 0
Granted (in dollars per share) 4.17 5.33 0
Vested (in dollars per share) 0 0 0
Forfeited (in dollars per share) 4.83 5.33 0
Outstanding at end of period (in dollars per share) $ 4.38 $ 5.33 $ 0