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Stock-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended | 36 Months Ended | 96 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2018 | Sep. 30, 2025 | Sep. 30, 2025 | Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares of common stock reserved for issuance under plan (in shares) | 2,700,000 |  |  |  | 2,700,000 | 2,700,000 |
Stock conversion basis (in shares) |  |  |  | 1 |  |  |
Granted (in shares) | 1,692 |  |  |  |  |  |
ESOP |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Options available under ESOP (in shares) | 100,000 |  |  |  | 100,000 | 100,000 |
Granted (in shares) |  |  |  |  |  | 33,810 |
Stock options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Outstanding share (In shares) | 1,642 | 11,150 | 13,575 |  | 1,642 | 1,642 | 27,507
Unrecognized compensation cost | $ 0.1 | $ 0.1 |  |  | $ 0.1 | $ 0.1 |
Weighted average period to recognize remaining cost | 1 year 4 months 24 days |  |  |  |  |  |
Granted (in shares) | 1,692 | 50 | 100 |  |  |  |
Stock options | 2014 Plan and the 2010 Equity Incentive Plan | Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting period | 2 years |  |  |  |  |  |
Stock options | 2014 Plan and the 2010 Equity Incentive Plan | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting period | 3 years |  |  |  |  |  |
Stock options | ESOP |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting period | 2 years |  |  |  |  |  |
Restricted Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Unrecognized compensation cost | $ 9.1 | $ 6.8 |  |  | $ 9.1 | $ 9.1 |
Weighted average period to recognize remaining cost | 1 year 10 months 24 days |  |  |  |  |  |
Estimated fair value of nonvested stock (in dollars per share) | $ 32.76 | $ 24.12 | $ 12.83 |  |  |  |
Performance share awards to be vested (in shares) | 709,122 | 719,499 | 942,057 |  | 709,122 | 709,122 | 848,188
Granted (in shares) | 325,789 | 385,438 | 674,932 |  |  |  |
Performance-based restricted stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting period | 3 years |  |  |  |  |  |
Estimated fair value of nonvested stock (in dollars per share) | $ 36.86 | $ 20.80 | $ 14.17 |  |  |  |
Performance share awards to be vested (in shares) | 307,097 | 303,712 | 348,223 |  | 307,097 | 307,097 | 436,146
Granted (in shares) | 96,603 | 183,396 | 249,534 |  |  |  |
Performance-based restricted stock | Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Payout percentage | 0.00% |  |  |  |  |  |
Performance-based restricted stock | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Payout percentage | 175.00% |  |  |  |  |  |
Performance-based restricted stock | 2020 Performance Shares |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting period | 3 years |  |  |  |  |  |
Unrecognized compensation cost | $ 0.1 |  |  |  | $ 0.1 | $ 0.1 |
Performance share awards to be vested (in shares) | 140,035 |  |  |  | 140,035 | 140,035 |
Compensation cost related to performance based awards | $ 0.3 | $ 1.5 | $ 0.6 |  | $ 2.5 |  |
Total Shareholder Return Performance Share |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Payout percentage | 30.00% |  |  |  |  |  |
Estimated fair value of nonvested stock (in dollars per share) | $ 36.86 |  |  |  |  |  |
Time-based restricted stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting period | 3 years |  |  |  |  |  |
Estimated fair value of nonvested stock (in dollars per share) | $ 31.03 | $ 27.14 | $ 12.05 |  |  |  |
Performance share awards to be vested (in shares) | 402,025 | 415,787 | 593,834 |  | 402,025 | 402,025 | 412,042
Granted (in shares) | 229,186 | 202,042 | 425,398 |  |  |  |

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