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Stock-Based Compensation (Details) - USD ($)
$ in Thousands
6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Feb. 04, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares Paid for Tax Withholding for Share Based Compensation 91,040 68,611  
Tax withholding for share-based compensation $ 1,000 $ 700  
Employee contributions 549 618 [1]  
Total intrinsic value of all options exercised 1,600 500  
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total unrecognized compensation cost nonvested awards $ 4,800    
Weighted average period, unrecognized compensation cost, nonvested awards 2 years 9 months 18 days    
Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total unrecognized compensation cost nonvested restricted stock units $ 8,500    
Weighted average period, unrecognized compensation cost, nonvested awards 1 year 9 months 18 days    
The 2019 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 1,524,170    
The 2019 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]      
Employee contributions $ 500 $ 600  
Common shares issued to employees 63,694 74,381  
Shares available for future issuance 251,882    
Director | The 2019 Plan | Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 1 year    
Executives and Employees | The 2019 Plan | Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 4 years    
[1] Prior period information has been restated for the adoption of ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606),” which we adopted on October 1, 2018.