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Share-Based Payments - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total stock-based compensation cost | $ 4,651 | $ 4,334 |
Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Granted (in shares) | 458,320 |  |
Percent of shares vested on time | 40.00% |  |
Unrecognized compensation cost on non-vested awards | $ 31,712 |  |
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 |  |
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) | 1,175,258 |  |
Options granted (in shares) | 75,000 |  |
Share-based awards outstanding (in shares) | 1,812,642 |  |
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) | 1,233,583 |  |
Amended 2017 Plan | Performance-Based Restricted Share Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Granted (in shares) | 1,579,514 |  |
Retirement Eligible Employees |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Future income tax benefit from compensation expense recognized | $ 684 | $ 551 |
Director Fee Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares deferred under stock based compensation plan (in shares) | 45,493 |  |
Value of annual stock based grant | $ 140 |  |
Total restricted stock awards granted to date (in shares) | 336,127 |  |
Restricted stock awards unvested (in shares) | 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 |  |

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