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Stock-Based Compensation - Restricted Stock Plan and Performance Shares (Details) - USD ($)
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Mar. 01, 2016
Feb. 23, 2009
Restricted Stock | 2009 Restricted Stock Plan          
Stock-Based Compensation          
Number of shares authorized under the plan         400,000
Restricted stock plan activity, number of shares          
Unvested and deferred at beginning of the period (in shares) 81,993        
Granted (in shares) 28,238        
Forfeited / Canceled (in shares) (19,944)        
Vested and deferred (in shares) (28,449)        
Unvested and deferred at end of the period (in shares) 61,838 81,993      
Expected to vest (in shares) 61,838        
Restricted stock plan activity, Weighted Average Fair Value at Grant Date          
Unvested and deferred at beginning of the period (in dollars per share) $ 37.28        
Granted (in dollars per share) 33.96        
Forfeited / Canceled (in dollars per share) 37.41        
Vested and deferred (in dollars per share) 39.02        
Unvested and deferred at end of the period (in dollars per share) 34.94 $ 37.28      
Expected to vest (in dollars per share) $ 34.94        
Deferred Restricted Stock plan activity, number of shares          
Vested (in shares) 28,449        
Deferred Restricted Stock plan activity, Weighted Average Fair Value at Grant Date          
Vested and deferred (in dollars per share) $ 39.02        
Restricted stock plan activity, other disclosures          
Compensation expense $ 631,000 $ 836,000 $ 1,340,000    
Remaining unrecognized compensation expense $ 976,000        
Weighted average period for recognition 1 year 4 months 10 days        
Restricted Stock | 2009 Restricted Stock Plan | Employees          
Restricted stock plan activity, other disclosures          
Repurchase of stock from employees (in shares) 11,356        
Average purchase price (in dollars per share) $ 32.60        
Restricted Stock | 2016 Restricted Stock Plan          
Restricted stock plan activity, number of shares          
Unvested and deferred at beginning of the period (in shares) 16,550        
Granted (in shares) 12,500        
Vested and deferred (in shares) (16,550)        
Unvested and deferred at end of the period (in shares) 12,500 16,550      
Expected to vest (in shares) 16,550        
Restricted stock plan activity, Weighted Average Fair Value at Grant Date          
Unvested and deferred at beginning of the period (in dollars per share) $ 31.76        
Granted (in dollars per share) 33.98        
Vested and deferred (in dollars per share) 31.76        
Unvested and deferred at end of the period (in dollars per share) 33.98 $ 31.76      
Expected to vest (in dollars per share) $ 31.76        
Deferred Restricted Stock plan activity, number of shares          
Vested (in shares) 16,550        
Deferred Restricted Stock plan activity, Weighted Average Fair Value at Grant Date          
Vested and deferred (in dollars per share) $ 31.76        
Restricted stock plan activity, other disclosures          
Compensation expense $ 442,000 $ 438,000 0    
Remaining unrecognized compensation expense $ 71,000        
Weighted average period for recognition 2 months 1 day        
Restricted Stock, Restricted Stock Units and Performance Shares          
Stock-Based Compensation          
Number of shares authorized under the plan       275,000  
Performance Shares | Certain Employees          
Restricted stock plan activity, number of shares          
Unvested and deferred at beginning of the period (in shares) 30,344        
Granted (in shares) 24,282        
Forfeited / Canceled (in shares) (16,073)        
Unvested and deferred at end of the period (in shares) 38,553 30,344      
Restricted stock plan activity, Weighted Average Fair Value at Grant Date          
Unvested and deferred at beginning of the period (in dollars per share) $ 49.32        
Granted (in dollars per share) 44.93        
Forfeited / Canceled (in dollars per share) 58.99        
Unvested and deferred at end of the period (in dollars per share) $ 42.52 $ 49.32      
Restricted stock plan activity, other disclosures          
Compensation expense $ 738,000 $ 500,000 $ 336,000    
Remaining unrecognized compensation expense $ 967,000        
Weighted average period for recognition 1 year 2 months 1 day