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Stock-Based Compensation - Restricted Stock Plan (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
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 at beginning of the period (in shares) 107,210        
Granted (in shares) 37,750        
Forfeited / Canceled (in shares) (36,092)        
Vested (in shares) (26,875)        
Unvested at end of the period (in shares) 81,993 107,210      
Expected to vest (in shares) 68,638        
Restricted stock plan activity, Weighted Average Fair Value at Grant Date          
Unvested at beginning of the period (in dollars per share) $ 41.36        
Granted (in dollars per share) 33.29        
Forfeited / Canceled (in dollars per share) 39.83        
Vested (in dollars per share) 44.51        
Unvested at end of the period (in dollars per share) 37.28 $ 41.36      
Expected to vest (in dollars per share) $ 37.19        
Restricted stock plan activity, other disclosures          
Compensation expense $ 836 $ 1,340 $ 1,466    
Remaining unrecognized compensation expense $ 890        
Weighted average period for recognition 8 months 9 days        
Restricted Stock | 2009 Restricted Stock Plan | Employees          
Restricted stock plan activity, other disclosures          
Repurchase of stock from employees (in shares) 6,937        
Average purchase price (in dollars per share) $ 32.23        
Restricted Stock | 2016 Restricted Stock Plan          
Restricted stock plan activity, number of shares          
Granted (in shares) 16,550        
Unvested at end of the period (in shares) 16,550        
Expected to vest (in shares) 16,550        
Restricted stock plan activity, Weighted Average Fair Value at Grant Date          
Granted (in dollars per share) $ 31.76        
Unvested at end of the period (in dollars per share) 31.76        
Expected to vest (in dollars per share) $ 31.76        
Restricted stock plan activity, other disclosures          
Compensation expense $ 438 $ 0      
Remaining unrecognized compensation expense $ 88        
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