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Stock-Based Compensation (Details) - USD ($)
$ in Thousands
6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Jan. 30, 2017
Feb. 01, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares Paid for Tax Withholding for Share Based Compensation 43,160 42,427    
Tax withholding for share-based compensation $ 600 $ 500    
Proceeds from stock option plan transactions 3,246 6,267    
Excess tax benefits from stock-based compensation 315 202    
Employee contributions 479 494    
Total intrinsic value of all options exercised $ 900 1,700    
Forfeiture rate 10.00%      
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total unrecognized compensation cost nonvested awards $ 4,300      
Weighted average period, unrecognized compensation cost, nonvested awards 3 years 4 months 24 days      
Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total unrecognized compensation cost nonvested restricted stock units $ 4,900      
Weighted average period, unrecognized compensation cost, nonvested awards 1 year 8 months 12 days      
The 2017 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized     1,500,000  
Number of shares available for future grants 1,465,545      
The 2017 Plan | Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 4 years      
Expiration period 7 years      
The 2016 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized       1,500,000
The 2016 Plan | Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 4 years      
Expiration period 7 years      
The Purchase Plan | The Purchase Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of continuous days of service 90 days      
Number of hours per week employed 20 hours      
Percent of market value 85.00%      
Offering period 3 months      
Employee contributions $ 479 $ 494    
Common shares issued to employees 48,299 55,343    
Shares available for future issuance 465,317      
Director | The 2017 Plan | Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 1 year      
Director | The 2016 Plan | Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 1 year      
Executives and Employees | The 2017 Plan | Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 4 years      
Executives and Employees | The 2016 Plan | Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 4 years