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Stock-Based Compensation (Details) - USD ($)
$ in Thousands
9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jan. 29, 2021
Jan. 29, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Proceeds from Stock Options Exercised $ 7,024 $ 5,063    
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation 109,516 95,997    
Tax withholding for share-based compensation $ 2,000 $ 1,700    
Total intrinsic value of all options exercised 5,400 3,400    
Proceeds from employee stock purchase plan transactions 917 798    
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Proceeds from Stock Options Exercised 7,000 $ 5,100    
Total unrecognized compensation cost nonvested awards $ 6,800      
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 $ 10,800      
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      
Common shares issued to employees 61,302 90,592    
Shares available for future issuance 650,412      
Proceeds from employee stock purchase plan transactions $ 900 $ 800    
The 2021 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized     1,400,000  
Number of shares available for future grants 1,325,088      
The 2021 Plan | Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 4 years      
Expiration period 7 years      
Director | The 2021 Plan | Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 1 year      
Executives and Employees | The 2021 Plan | Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 4 years      
Executives | The 2021 Plan | Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 3 years