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Stock-Based Compensation (Tables)
 6 Months Ended
Mar. 31, 2020
Share-based Payment Arrangement [Abstract]  
Summary of restricted share and performance-based stock award activity
The following is a summary of the Plans’ restricted share and performance-based stock award activity as of March 31, 2020 and September 30, 2019. The number of performance shares granted in the following table are reflected at the amount of achievement of the pre-established targets.
March 31, 2020September 30, 2019
Common
Shares		Weighted-Average Grant Date Fair ValueCommon
Shares		Weighted-Average Grant Date Fair Value
Restricted Shares
Restricted shares, beginning of fiscal year190,805  $37.20  163,287  $37.86  
Granted134,185  32.34  106,753  37.27  
Vested(83,909) 38.61  (76,210) 38.64  
Forfeited(3,109) 36.61  (3,025) 38.67  
Canceled—  —  —  —  
Restricted shares, end of period237,972  $33.97  190,805  $37.20  
Vested, but not issuable at end of period62,992  $33.98  50,770  $33.88  
Performance Shares
Performance shares, beginning of fiscal year173,332  $38.50  175,196  $36.29  
Granted(48,753) (49.22) 60,583  32.77  
Vested(54,861) 39.43  (59,937) 30.79  
Forfeited(3,732) 38.14  (2,510) 39.25  
Canceled—  —  —  —  
Performance shares, end of period65,986  $34.61  173,332  $38.50  
Vested, but not issuable at end of period5,612  $18.00  5,612  $18.00