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Shareholders’ Equity - Restricted Stock Activity (Details) - Restricted Stock Awards - 2016 Plan - $ / shares
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Number Of Shares      
Unvested shares, beginning of year (in shares) 110,240 104,020 57,760
Shares granted (in shares) 90,400 77,500 88,600
Vested shares withheld and repurchased (in shares) (17,167) (11,369) (6,966)
Shares vested (in shares) (56,833) (59,671) (35,374)
Shares forfeited (in shares) (480) (240) 0
Unvested shares, end of year (in shares) 126,160 110,240 104,020
Weighted Average Grant Date Fair Value      
Unvested shares, beginning of year (in dollars per share) $ 69.11 $ 45.57 $ 37.84
Shares granted (in dollars per share) 48.31 90.83 50.65
Shares repurchased (in dollars per share) 48.18 86.92 51.35
Shares vested (in dollars per share) 51.46 64.90 44.69
Shares forfeited (in dollars per share) 68.95 84.90 0
Unvested shares, end of year (in dollars per share) $ 59.38 $ 69.11 $ 45.57