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Stock-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended | 36 Months Ended | 60 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 30, 2019 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2022 | Sep. 30, 2022 | Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares of common stock reserved for issuance under plan (in shares) |  | 1,500,000 |  |  | 1,500,000 | 1,500,000 |
Number of shares of common stock available for future grants (in shares) |  | 1,500,000 |  |  | 1,500,000 | 1,500,000 |
Intrinsic value of stock options outstanding |  | $ 0.1 |  |  | $ 0.1 | $ 0.1 |
Intrinsic value of stock options exercisable |  | $ 0.1 |  |  | $ 0.1 | $ 0.1 |
Granted (in shares) |  | 236 | 0 |  |  |  |
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) |  |  |  |  |  | 31,968 |
Stock options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
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) |  | 236 | 0 | 950 |  |  |
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 |  | $ 7.3 | $ 7.2 |  | $ 7.3 | $ 7.3 |
Weighted average period to recognize remaining cost |  | 1 year 8 months 12 days |  |  |  |  |
Estimated fair value of nonvested stock (in dollars per share) |  | $ 20.14 | $ 15.67 | $ 16.04 |  |  |
Performance share awards to be vested (in shares) |  | 848,188 | 1,224,729 | 1,406,154 | 848,188 | 848,188 | 1,390,421
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) |  | 91,858 |  |  |  |  |
Estimated fair value of nonvested stock (in dollars per share) |  | $ 18.98 | $ 17.90 | $ 16.98 |  |  |
Performance share awards to be vested (in shares) |  | 436,146 | 738,155 | 796,024 | 436,146 | 436,146 | 778,814
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 |  | $ 0.3 |  |  | $ 0.3 | $ 0.3 |
Performance share awards to be vested (in shares) |  | 334,736 |  |  | 334,736 | 334,736 |
Compensation cost related to performance based awards |  | $ 2.1 | $ 3.3 | $ 1.3 | $ 7.0 |  |
Performance-based restricted stock | 2017 Performance-Based Award Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Performance based restricted stock settled in cash payment (in shares) | 135,337 |  |  |  |  |  |
Cash settlement of performance-based restricted stock | $ 2.1 |  |  |  |  |  |
Total Shareholder Return Performance Share |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Payout percentage |  | 20.00% |  |  |  |  |
Estimated fair value of nonvested stock (in dollars per share) |  | $ 23.36 |  |  |  |  |
Time-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) |  | 246,844 |  |  |  |  |
Estimated fair value of nonvested stock (in dollars per share) |  | $ 21.40 | $ 14.21 | $ 15.29 |  |  |
Performance share awards to be vested (in shares) |  | 412,042 | 486,574 | 610,130 | 412,042 | 412,042 | 611,607

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