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Share-Based Payments - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2021 | Jun. 30, 2024 | Jun. 30, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Total stock-based compensation cost | $ 5,331 | $ 5,023 |  | $ 14,309 | $ 13,635
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 | $ 22,341 |  |  | $ 22,341 |
Weighted average period of recognition of unrecognized compensation cost on non-vested awards |  |  |  | 1 year 10 months 24 days |
Restricted stock awards unvested (in shares) | 71,549 |  |  | 71,549 |
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 |  |  | 3,450,000 |
Shares issuance under award plan (in shares) |  |  |  | 1,180,989 |
Options granted (in shares) |  |  |  | 75,000 |
Share-based awards outstanding (in shares) | 1,717,761 |  |  | 1,717,761 |
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 | $ 1,351 | $ 1,249 |  | $ 3,128 | $ 2,856
Director Fee Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares deferred under stock based compensation plan (in shares) | 50,725 |  |  | 50,725 |
Value of annual stock based grant |  |  |  | $ 140 |
Total restricted stock awards granted to date (in shares) | 377,460 |  |  | 377,460 |
Restricted stock awards unvested (in shares) | 204,231 |  |  | 204,231 |
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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