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Stock Award Plans - Nonvested Stock Options (Details) - $ / shares
 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Options Outstanding      
Outstanding at beginning of period (in shares) 0 0 69,287
Vested (in shares) 0 0 (62,227)
Forfeited (in shares) 0 0 (7,060)
Outstanding at end of period (in shares) 0 0 0
Weighted Average Grant Date Fair Value      
Outstanding at beginning of period (in dollars per share) $ 0.00 $ 0.00 $ 3.85
Vested (in dollars per share) 0.00 0.00 3.91
Forfeited (in dollars per share) 0.00 0.00 3.89
Outstanding at end of period (in dollars per share) $ 0.00 $ 0.00 $ 0.00