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Stock-Based Compensation (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Jan. 29, 2021
Jan. 29, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation 114,889 106,012 102,392    
Proceeds from employee stock purchase plan transactions $ 2,206 $ 2,263 $ 1,500    
Total intrinsic value of all options exercised 5,600 5,200 20,300    
Total grant date fair value of shares vested 3,000 4,500 3,000    
Proceeds from Stock Options Exercised 2,978 3,926 9,505    
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation 700 200 4,300    
Total unrecognized compensation cost nonvested awards $ 2,800        
Weighted average period, unrecognized compensation cost, nonvested awards 1 year 6 months        
Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation $ 2,900 4,100 2,400    
Weighted average period, unrecognized compensation cost, nonvested awards 1 year 10 months 24 days        
Total unrecognized compensation cost, restricted stock units $ 17,700        
Employee Stock          
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%        
Proceeds from employee stock purchase plan transactions $ 2,200 $ 2,300 $ 1,500    
Common shares issued to employees 101,730 82,621 80,225    
Shares available for future issuance 368,497        
Performance Shares          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted average period, unrecognized compensation cost, nonvested awards 2 months 12 days        
Total unrecognized compensation cost, restricted stock units $ 1,800        
The Purchase Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized         3,425,000
The 2021 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares available for future grants 1,953,397        
Number of shares authorized       3,500,000  
The 2021 Plan | Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expiration period 7 years        
Vesting period 4 years        
Director | The 2021 Plan | Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expiration period 1 year        
Vesting period 4 years        
Director | The 2021 Plan | Performance Shares          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period 3 years        
Executives and Employees | The 2021 Plan | Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period 4 years