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Share-Based Payments - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation cost | $ 5,713 | $ 2,539 | $ 12,960 | $ 7,078
Restricted Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares issued under the 2017 Equity incentive plan (in shares) |  |  | 499,050 |
Percent of shares vested on time |  |  | 45.00% |
Unrecognized compensation cost on non-vested awards | $ 12,893 |  | $ 12,893 |
Weighted average period of recognition of unrecognized compensation cost on non-vested awards |  |  | 2 years |
Restricted stock awards unvested (in shares) | 74,639 |  | 74,639 |
Restricted Stock | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Expiration period |  |  | 3 years |
Restricted Stock | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Expiration period |  |  | 5 years |
Restricted Stock | Tranche One |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting increment |  |  | 50.00% |
Restricted Stock | Tranche Two |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting increment |  |  | 25.00% |
Restricted Stock | Tranche Three |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting increment |  |  | 25.00% |
Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Expiration period |  |  | 5 years |
Award vesting period |  |  | 3 years |
Stock Options | Tranche One |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting increment |  |  | 33.33% |
Stock Options | Tranche Two |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting increment |  |  | 33.33% |
Stock Options | Tranche Three |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting increment |  |  | 33.33% |
2017 Equity Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options issued under the 2017 Equity incentive plan (in shares) | 75,000 |  | 75,000 |
Share price of options granted (in dollars per share) | $ 41.70 |  |  |
2017 Equity Incentive Plan | Stock Compensation Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Term of plan |  |  | 10 years |
Maximum number of shares available for grants or awards (in shares) | 1,700,000 |  | 1,700,000 |
Shares reserved for future issuance under award plan (in shares) | 1,700,000 |  | 1,700,000 |
2017 Equity Incentive Plan | Restricted Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares issued under the 2017 Equity incentive plan (in shares) |  |  | 1,064,910 |
Retirement Eligible Employees |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Future income tax benefit from compensation expense recognized | $ 1,467 | $ 622 | $ 2,443 | $ 1,415
Director Fee Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares deferred under stock based compensation plan (in shares) | 38,482 |  | 38,482 |
Value of annual stock based grant |  |  | $ 125 |
Total restricted stock awards granted to date (in shares) | 271,807 |  | 271,807 |
Restricted stock awards unvested (in shares) | 98,578 |  | 98,578 |
2014 Director Fee Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Annual retainer fee paid to non-employee directors |  |  | $ 85 |
Annual retainer fee paid to non-employee Chairman of the Board |  |  | $ 185 |
2019 Director Fee Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Maximum number of shares available for grants or awards (in shares) | 150,000 |  | 150,000 |

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