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Stock-Based Compensation (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023 | 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 | 113,504 | 114,889 | 106,012 |  |
Proceeds from employee stock purchase plan transactions | $ 2,285 | $ 2,206 | $ 2,263 |  |
Total intrinsic value of all options exercised | 10,100 | 5,600 | 5,200 |  |
Total grant date fair value of shares vested | 2,500 | 3,000 | 4,500 |  |
Proceeds from Stock Options Exercised | 3,525 | 2,978 | 3,926 |  |
Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation | 3,200 | 700 | 200 |  |
Total unrecognized compensation cost nonvested awards | $ 1,800 |  |  |  |
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 | $ 3,700 | 2,900 | 4,100 |  |
Weighted average period, unrecognized compensation cost, nonvested awards | 1 year 10 months 24 days |  |  |  |
Total unrecognized compensation cost, restricted stock units | $ 20,400 |  |  |  |
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 | $ 2,300 | $ 2,200 | $ 2,300 |  |
Common shares issued to employees | 91,794 | 101,730 | 82,621 |  |
Shares available for future issuance | 276,703 |  |  |  |
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 | $ 0 |  |  |  |
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 | 3,356,219 |  |  |  |
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 |  |  |  |

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