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Shareholders’ Equity - Restricted Stock Activity (Details) - Restricted Stock Awards - 2016 Plan
 12 Months Ended
Sep. 30, 2016
$ / shares
shares
Number of shares  
Unvested shares, beginning of year | shares 0
Shares granted | shares 84,700
Shares repurchased | shares (2,268)
Shares vested, net of shares repurchased | shares (24,672)
Unvested shares, end of year | shares 57,760
Weighted Average Grant Date Fair Value  
Unvested shares, beginning of year (in dollars per share) | $ / shares $ 0.00
Shares granted (in dollars per share) | $ / shares 36.55
Shares repurchased (in dollars per share) | $ / shares 40.25
Shares vested, net of shares repurchased (in dollars per share) | $ / shares 33.41
Unvested shares, end of year (in dollars per share) | $ / shares $ 37.84