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Stock-Based Compensation (Details) - USD ($) $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Jan. 29, 2020 | Feb. 04, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation | 95,209 | 91,040 |  |
Tax withholding for share-based compensation | $ 1,700 | $ 1,000 |  |
Employee contributions | 516 | 549 |  |
Total intrinsic value of all options exercised | 3,300 | 1,600 |  |
Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total unrecognized compensation cost nonvested awards | $ 7,300 |  |  |
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 | $ 10,600 |  |  |
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 |  |  |
Employee contributions | $ 500 | $ 549 |  |
Common shares issued to employees | 53,085 | 63,694 |  |
Shares available for future issuance | 776,455 |  |  |
The 2019 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 | 1,307,117 |  |  |
The 2019 Plan | Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period | 4 years |  |  |
Expiration period | 7 years |  |  |
Director | The 2019 Plan | Restricted Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period | 1 year |  |  |
Executives and Employees | The 2019 Plan | Restricted Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period | 4 years |  |  |

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