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Share-Based Payments - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Jun. 30, 2021 | Mar. 31, 2023 | Mar. 31, 2022 | Nov. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Total stock-based compensation cost | $ 4,278 | $ 5,222 |  | $ 8,612 | $ 8,931 |
Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Granted (in shares) |  |  |  | 618,050 |  |
Percent of shares vested on time |  |  |  | 43.00% |  |
Unrecognized compensation cost on non-vested awards | $ 26,437 |  |  | $ 26,437 |  |
Weighted average period of recognition of unrecognized compensation cost on non-vested awards |  |  |  | 2 years 3 months 18 days |  |
Restricted stock awards unvested (in shares) | 60,057 |  |  | 60,057 |  |
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] |  |  |  |  |  |
Award vesting period |  |  | 3 years |  |  |
Expiration period |  |  | 5 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 granted (in shares) |  |  | 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 |  |
Amended 2017 Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares reserved for future issuance under award plan (in shares) |  |  |  |  |  | 3,450,000
Shares issuance under award plan (in shares) |  |  |  | 486,503 |  |
Options granted (in shares) |  |  |  | 75,000 |  |
Share-based awards outstanding (in shares) | 1,811,152 |  |  | 1,811,152 |  |
Percentage of outstanding stock maximum |  |  |  | 200.00% |  |
Amended 2017 Plan | Time-Based Restricted Share Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Granted (in shares) |  |  |  | 1,041,615 |  |
Amended 2017 Plan | Performance-Based Restricted Share Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Granted (in shares) |  |  |  | 1,313,162 |  |
Retirement Eligible Employees |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Future income tax benefit from compensation expense recognized | $ 1,057 | $ 1,278 |  | $ 1,608 | $ 1,688 |
Director Fee Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares deferred under stock based compensation plan (in shares) | 49,084 |  |  | 49,084 |  |
Value of annual stock based grant |  |  |  | $ 140 |  |
Total restricted stock awards granted to date (in shares) | 336,127 |  |  | 336,127 |  |
Restricted stock awards unvested (in shares) | 162,898 |  |  | 162,898 |  |
2014 Director Fee Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Annual retainer fee paid to non-employee directors |  |  |  | $ 90 |  |
Annual retainer fee paid to non-employee Chairman of the Board |  |  |  | $ 210 |  |
2019 Director Fee Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares available for grants or awards (in shares) | 300,000 |  |  | 300,000 |  |

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