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Stock-Based Compensation (Details) - USD ($)
$ in Thousands
9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jan. 29, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares Paid for Tax Withholding for Share Based Compensation 72,918 48,076  
Tax withholding for share-based compensation $ 700 $ 600  
Proceeds from stock option plan transactions 3,871 3,264  
Employee contributions 892 686  
Total intrinsic value of all options exercised 700 900  
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 2 years 8 months 12 days    
Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total unrecognized compensation cost nonvested restricted stock units $ 5,400    
Weighted average period, unrecognized compensation cost, nonvested awards 1 year 4 months 24 days    
The 2018 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 1,473,215    
The 2018 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 $ 900 $ 700  
Common shares issued to employees 105,732 72,594  
Shares available for future issuance 335,290    
Director | The 2018 Plan | Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 1 year    
Executives and Employees | The 2018 Plan | Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 4 years