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Stock-Based Compensation (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021 | 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 | 106,012 | 102,392 | 116,195 |  |
Proceeds from employee stock purchase plan transactions | $ 2,263 | $ 1,500 | $ 1,214 |  |
Total intrinsic value of all options exercised | 5,200 | 20,300 | 6,500 |  |
Total grant date fair value of shares vested | 4,500 | 3,000 | 2,600 |  |
Proceeds from Stock Options Exercised | 3,926 | 9,505 | 8,525 |  |
Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation | 200 | 4,300 |  |  |
Total unrecognized compensation cost nonvested awards | $ 4,900 |  |  |  |
Weighted average period, unrecognized compensation cost, nonvested awards | 1 year 9 months 18 days |  |  |  |
Restricted Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation | $ 4,100 | 2,400 | 2,100 |  |
Weighted average period, unrecognized compensation cost, nonvested awards | 2 years 1 month 6 days |  |  |  |
Total unrecognized compensation cost, restricted stock units | $ 19,300 |  |  |  |
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 | $ 1,500 | $ 1,200 |  |
Common shares issued to employees | 82,621 | 80,225 | 78,644 |  |
Shares available for future issuance | 470,227 |  |  |  |
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 | 2,365,365 |  |  |  |
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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