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Stock-Based Compensation (Tables)
 12 Months Ended
Sep. 30, 2020
Share-based Payment Arrangement [Abstract]  
Summary of the Plans' 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 September 30, 2020, 2019 and 2018. The number of performance shares granted in the following table are reflected at the amount of achievement of the pre-established targets.
September 30, 2020September 30, 2019September 30, 2018
Common
Shares		Weighted-Average Grant Date Fair ValueCommon
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 $37.86 180,337 $33.06 
Granted147,282 30.68 106,753 37.27 89,376 41.07 
Vested(84,316)38.60 (76,210)38.64 (97,682)32.11 
Forfeited(4,591)36.18 (3,025)38.67 (8,744)35.99 
Canceled— — — — — — 
Restricted shares, end of period249,180 $32.89 190,805 $37.20 163,287 $37.86 
Vested, but not issuable at end of period62,992 $33.98 50,770 $33.88 39,514 $32.90 
Performance Shares
Performance shares, beginning of fiscal year173,332 $38.50 175,196 $36.29 133,604 $33.39 
Granted62,278 40.15 60,583 32.77 53,682 29.52 
Vested(54,861)39.43 (59,937)30.79 (7,017)18.00 
Forfeited(5,009)37.90 (2,510)39.25 (5,073)37.75 
Canceled— — — — — — 
Performance shares, end of period175,740 $33.56 173,332 $38.50 175,196 $36.29 
Vested, but not issuable at end of period5,612 $18.00 5,612 $18.00 5,612 $18.00