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Stock-Based Compensation (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Jan. 29, 2020 | Feb. 04, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Proceeds from Stock Options Exercised |  |  | $ 5,063 | $ 4,054 |  |
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation |  |  | 95,997 | 91,580 |  |
Tax withholding for share-based compensation |  |  | $ 1,700 | $ 1,100 |  |
Employee contributions |  |  | 798 | 835 |  |
Total intrinsic value of all options exercised |  |  | 3,400 | 1,700 |  |
Stock Options |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Proceeds from Stock Options Exercised | $ 300 | $ 300 | 5,100 | 4,100 |  |
Total unrecognized compensation cost nonvested awards | 6,700 |  | $ 6,700 |  |  |
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 | 10,700 |  | $ 10,700 |  |  |
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 |  |  |
Employee contributions | $ 300 | $ 300 | $ 800 | $ 800 |  |
Common shares issued to employees | 37,333 | 26,898 | 90,418 | 90,592 |  |
Shares available for future issuance | 739,122 |  | 739,122 |  |  |
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 | 1,198,802 |  | 1,198,802 |  |  |
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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