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Stock-Based Compensation (Details) - USD ($)
$ in Thousands
9 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Feb. 04, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation 91,580 72,918  
Tax withholding for share-based compensation $ 1,100 $ 700  
Employee contributions 835 892 [1]  
Total intrinsic value of all options exercised 1,700 700  
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total unrecognized compensation cost nonvested awards $ 4,200    
Weighted average period, unrecognized compensation cost, nonvested awards 2 years 7 months 6 days    
Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total unrecognized compensation cost nonvested restricted stock units $ 7,600    
Weighted average period, unrecognized compensation cost, nonvested awards 1 year 6 months    
The Purchase Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee contributions $ 800 $ 900  
Common shares issued to employees 90,592 105,732  
Shares available for future issuance 224,984    
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 1,556,370    
The 2019 Plan | Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 4 years    
Expiration period 7 years    
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.