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Shareholders’ Equity - Restricted Stock Activity Narrative (Details) - Restricted Stock Awards - 2016 Plan - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares nonvested (in shares) | 233,346 | 204,620 | 202,740 | 160,310
Number of shares vested (in shares) | 105,292 | 104,012 | 78,449 |
Estimated future compensation expense | $ 5,905 |  |  |
Weighted average period compensation expense will be recorded (in years) | 26 months |  |  |
Class A |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares available for future issuance (in shares) | 103,975 |  |  |
Tranche One |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares vested (in shares) | 80,932 |  |  |
Tranche Two |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares vested (in shares) | 69,291 |  |  |
Tranche Three |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares vested (in shares) | 51,892 |  |  |
Tranche Four |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares vested (in shares) | 31,231 |  |  |

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