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Stock-Based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Jan. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares Paid for Tax Withholding for Share Based Compensation 64,276 28,701  
Tax withholding for share-based compensation $ 600 $ 400  
Proceeds from stock option plan transactions 2,972 2,787  
Employee contributions 380 297  
Total intrinsic value of all options exercised 400 800  
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total unrecognized compensation cost nonvested awards $ 5,400    
Weighted average period, unrecognized compensation cost, nonvested awards 3 years    
Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total unrecognized compensation cost nonvested restricted stock units $ 6,300    
Weighted average period, unrecognized compensation cost, nonvested awards 1 year 9 months 18 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 1,172,108    
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 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 $ 400 $ 300  
Common shares issued to employees 45,718 30,351  
Shares available for future issuance 395,304    
Director | The 2017 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