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Stock-Based Compensation (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Jan. 29, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Proceeds from Stock Options Exercised | $ 3,944 | $ 4,160 |
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation | 83,928 | 88,723 |
Tax withholding for share-based compensation | $ 1,400 | $ 1,600 |
Total intrinsic value of all options exercised | 2,200 | 3,000 |
Proceeds from employee stock purchase plan transactions | 334 | 286 |
Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Proceeds from Stock Options Exercised | 3,900 | $ 4,200 |
Total unrecognized compensation cost nonvested awards | $ 7,900 |  |
Weighted average period, unrecognized compensation cost, nonvested awards | 3 years 1 month 6 days |  |
Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total unrecognized compensation cost nonvested restricted stock units | $ 12,300 |  |
Weighted average period, unrecognized compensation cost, nonvested awards | 1 year 9 months 18 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 | 25,246 | 24,738 |
Shares available for future issuance | 686,468 |  |
Proceeds from employee stock purchase plan transactions | $ 300 | $ 286 |
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 | 648,815 |  |
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 |  |

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