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Stock-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Feb. 29, 2024 | Feb. 28, 2023 | Feb. 28, 2022 | Feb. 28, 2014 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022 | Oct. 01, 2023
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Unvested restricted stock outstanding (in shares) |  |  |  |  | 192,011 | 292,497 |  |
Compensation expense |  |  |  |  | $ 4.2 | $ 4.0 | $ 3.7 |
Amounts not yet recognized related to non-vested stock totaled |  |  |  |  | $ 2.1 | 1.4 |  |
Weighted average remaining contractual life |  |  |  |  | 1 year 2 months 23 days |  |  |
Restricted Stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares issued annually, grant date value |  |  |  |  |  |  |  | $ 0.1
Compensation expense |  |  |  |  | $ 0.6 | $ 0.6 | $ 0.4 |
Weighted average remaining contractual life |  |  |  |  | 5 months |  |  |
2014 Equity Incentive Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Authorized plan extension period |  | 5 years |  |  |  |  |  |
Number of additional shares authorized (in shares) |  | 600,000 |  |  |  |  |  |
Number of shares authorized (in shares) |  | 1,350,000 |  |  |  |  |  |
2014 Equity Incentive Plan | Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting period |  |  |  | 3 years |  |  |  |
2014 Equity Incentive Plan | Restricted Stock Units (RSUs) | Time Based Restricted Stock Unit |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting period |  |  |  | 3 years |  |  |  |
2014 Equity Incentive Plan | Restricted Stock Units (RSUs) | Performance Based Restricted Stock Unit |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting period |  |  |  | 3 years |  |  |  |
2014 Equity Incentive Plan | Restricted Stock Units (RSUs) | Minimum | Time Based Restricted Stock Unit |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Actual amount of RSUs earned based on cumulative earnings |  |  |  | 50.00% |  |  |  |
2014 Equity Incentive Plan | Restricted Stock Units (RSUs) | Maximum | Performance Based Restricted Stock Unit |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Target RSUs granted range |  |  |  | 50.00% |  |  |  |
2014 Director Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Authorized plan extension period |  |  | 10 years |  |  |  |  |
Number of additional shares authorized (in shares) |  |  | 200,000 |  |  |  |  |
Number of shares authorized (in shares) |  |  | 350,000 |  |  |  |  |
Common stock, capital shares reserved for future issuance (in shares) |  |  |  |  | 185,980 |  |  |
2014 Director Plan | Restricted Stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Unvested restricted stock outstanding (in shares) |  |  |  |  | 4,620 | 8,400 |  |
Maximum number of shares granted to any individual (in shares) |  |  |  | 12,000 |  |  |  |
Number of shares issued to any individual (in shares) |  |  |  | 4,000 |  |  |  |
Restricted stock issuable to eligible Board of Directors members annually (in shares) |  |  |  | 2,400 |  |  |  |
2014 Director Plan | Restricted Stock | Share-Based Payment Arrangement, Nonemployee |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares issued under the plan (in shares) | 4,620 | 16,800 |  |  |  |  |  |
Shares issued, price per share (in dollars per share) | $ 153.81 | $ 43.22 |  |  |  |  |  |
2014 Director Plan | Restricted Stock | Vesting of First Anniversary |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting percentage |  |  |  | 50.00% |  |  |  |
2014 Director Plan | Restricted Stock | Vesting of Second Anniversary |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting percentage |  |  |  | 50.00% |  |  |  |

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