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Stock-Based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Jan. 29, 2020
Feb. 04, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Proceeds from Stock Options Exercised     $ 5,063 $ 4,054    
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation     95,997 91,580    
Tax withholding for share-based compensation     $ 1,700 $ 1,100    
Employee contributions     798 835    
Total intrinsic value of all options exercised     3,400 1,700    
Stock Options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Proceeds from Stock Options Exercised $ 300 $ 300 5,100 4,100    
Total unrecognized compensation cost nonvested awards 6,700   $ 6,700      
Weighted average period, unrecognized compensation cost, nonvested awards     2 years 10 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 10,700   $ 10,700      
Weighted average period, unrecognized compensation cost, nonvested awards     1 year 7 months 6 days      
The Purchase Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares authorized         3,425,000  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Continuous Days of Service     90 days      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Hours Per Week Employed     20 hours      
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent     85.00%      
Share-based Compensation Arrangement by Share-based Payment Award, Offering Period     3 months      
Employee contributions $ 300 $ 300 $ 800 $ 800    
Common shares issued to employees 37,333 26,898 90,418 90,592    
Shares available for future issuance 739,122   739,122      
The 2020 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 1,198,802   1,198,802      
The 2020 Plan | Stock Options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period     4 years      
Expiration period     7 years      
Director | The 2020 Plan | Restricted Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period     1 year      
Executives and Employees | The 2020 Plan | Restricted Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period     4 years