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Stock-Based Compensation - Restricted Stock Plan (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Mar. 01, 2016
Feb. 23, 2009
Restricted Stock          
Restricted stock plan activity, number of shares          
Unvested at beginning of the period (in shares) 121,010        
Granted (in shares) 37,275        
Forfeited / Canceled (in shares) (12,650)        
Vested (in shares) (38,425)        
Unvested at end of the period (in shares) 107,210 121,010      
Expected to vest (in shares) 80,293        
Restricted stock plan activity, Weighted Average Fair Value at Grant Date          
Unvested at beginning of the period (in dollars per share) $ 44.51        
Granted (in dollars per share) 40.86        
Forfeited / Canceled (in dollars per share) 52.32        
Vested (in dollars per share) 47.20        
Unvested at end of the period (in dollars per share) 41.36 $ 44.51      
Expected to vest (in dollars per share) $ 40.98        
Restricted stock plan activity, other disclosures          
Compensation expense $ 1,340 $ 1,466 $ 1,650    
Remaining unrecognized compensation expense $ 1,266        
Weighted average period for recognition 7 months 13 days        
Restricted Stock | Employees          
Restricted stock plan activity, other disclosures          
Repurchase of stock from employees (in shares) 6,017        
Average purchase price (in dollars per share) $ 44.15        
Restricted Stock | 2009 Restricted Stock Plan          
Stock-Based Compensation          
Number of shares authorized under the plan         400,000
Restricted Stock, Restricted Stock Units and Performance Shares | 2016 Restricted Stock, Restricted Stock Units and Performance Shares Plan          
Stock-Based Compensation          
Number of shares authorized under the plan       275,000