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Stock-Based Compensation (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Feb. 04, 2019 | Jan. 29, 2018 | Jan. 27, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Proceeds from employee stock purchase plan transactions | $ 1,058 | $ 1,115 | [1] | $ 685 | [1] |  |  |
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation | 93,128 | 74,204 |  | 49,684 |  |  |  |
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation | $ 1,100 | $ 700 |  | $ 700 |  |  |  |
Total intrinsic value of all options exercised | 2,100 | 1,200 |  | 900 |  |  |  |
Total grant date fair value of shares vested | 3,500 | 3,300 |  | 2,400 |  |  |  |
Stock Options |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Total unrecognized compensation cost nonvested awards | $ 4,300 |  |  |  |  |  |  |
Weighted average period, unrecognized compensation cost, nonvested awards | 2 years 8 months 12 days |  |  |  |  |  |  |
Restricted Stock Units |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Weighted average period, unrecognized compensation cost, nonvested awards | 1 year 4 months 24 days |  |  |  |  |  |  |
Total unrecognized compensation cost, restricted stock units | $ 7,500 |  |  |  |  |  |  |
The Purchase Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares authorized |  |  |  |  |  |  |  | 2,800,000
Proceeds from employee stock purchase plan transactions | $ 1,100 | $ 1,100 |  | $ 700 |  |  |  |
Number of continuous days of service | 90 days |  |  |  |  |  |  |
Number of hours per week employed | 20 hours |  |  |  |  |  |  |
Percent of market value | 85.00% |  |  |  |  |  |  |
Offering period | 3 months |  |  |  |  |  |  |
Common shares issued to employees | 111,036 | 125,446 |  | 72,594 |  |  |  |
Shares available for future issuance | 204,540 |  |  |  |  |  |  |
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 | 1,399,866 |  |  |  |  |  |  |
The 2019 Plan | Stock Options |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Expiration period | 7 years |  |  |  |  |  |  |
Vesting period | 4 years |  |  |  |  |  |  |
The 2018 Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares authorized |  |  |  |  |  |  | 1,500,000 |
The 2018 Plan | Stock Options |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Expiration period | 7 years |  |  |  |  |  |  |
Vesting period | 4 years |  |  |  |  |  |  |
Director | The 2019 Plan | Restricted Stock Units |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting period | 1 year |  |  |  |  |  |  |
Director | The 2018 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 |  |  |  |  |  |  |
Executives and Employees | The 2018 Plan | Restricted Stock Units |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting period | 4 years |  |  |  |  |  |  |
[1] | Prior period information has been restated for the adoption of ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606)”, which we adopted on October 1, 2018.

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