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Stock-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended | 36 Months Ended | 84 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2018 | Sep. 30, 2022 | Sep. 30, 2024 | Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares of common stock reserved for issuance under plan (in shares) | 3,000,000.0 |  |  |  |  | 3,000,000.0 |
Stock conversion basis (in shares) |  |  |  | 1 |  |  |
Granted (in shares) | 50 |  |  |  |  |  |
ESOP |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Options available under ESOP (in shares) | 100,000 |  |  |  |  | 100,000 |
Granted (in shares) |  |  |  |  |  | 32,118 |
Stock options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Outstanding share (In shares) | 11,150 | 13,575 | 27,507 |  | 27,507 | 11,150 | 114,259
Unrecognized compensation cost | $ 0.1 | $ 0.1 |  |  |  | $ 0.1 |
Weighted average period to recognize remaining cost | 1 year 3 months 18 days |  |  |  |  |  |
Granted (in shares) | 50 | 100 | 236 |  |  |  |
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 | $ 6.8 | $ 6.9 |  |  |  | $ 6.8 |
Weighted average period to recognize remaining cost | 1 year 8 months 12 days |  |  |  |  |  |
Estimated fair value of nonvested stock (in dollars per share) | $ 24.12 | $ 12.83 | $ 20.14 |  |  |  |
Performance share awards to be vested (in shares) | 719,499 | 942,057 | 848,188 |  | 848,188 | 719,499 | 1,224,729
Performance-based restricted stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting period | 3 years |  |  |  |  |  |
Stock awards granted in period (in shares) | 75,288 |  |  |  |  |  |
Estimated fair value of nonvested stock (in dollars per share) | $ 20.80 | $ 14.17 | $ 18.98 |  |  |  |
Performance share awards to be vested (in shares) | 303,712 | 348,223 | 436,146 |  | 436,146 | 303,712 | 738,155
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 |
Performance share awards to be vested (in shares) | 71,470 |  |  |  |  | 71,470 |
Compensation cost related to performance based awards | $ 0.4 | $ 1.0 | $ 0.6 |  | $ 2.1 |  |
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) | $ 28.69 |  |  |  |  |  |
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) | $ 27.14 | $ 12.05 | $ 21.40 |  |  |  |
Performance share awards to be vested (in shares) | 415,787 | 593,834 | 412,042 |  | 412,042 | 415,787 | 486,574

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