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Stock-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Feb. 29, 2024 | Mar. 31, 2024 | Mar. 31, 2023 | Sep. 30, 2023
Restricted Stock Units (RSUs) |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Vesting period |  | 3 years |  |
Unvested restricted stock outstanding (in shares) |  | 193,346 |  | 292,497
Compensation expense |  | $ 2.7 | $ 2.5 |
Restricted Stock Units (RSUs) | Time-Based Restricted Stock Unit |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Vesting period |  | 3 years |  |
Restricted Stock Units (RSUs) | Performance-Based Restricted Stock Unit |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Vesting period |  | 3 years |  |
Restricted Stock |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Compensation expense |  | $ 0.2 | $ 0.5 |
Shares issued annually, grant date value |  | $ 0.1 |  |
Restricted Stock | Non-Employee Director Equity Incentive Plan |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Shares issued under the plan (in shares) |  | 2,400 |  |
Restricted Stock | Non-Employee Director Equity Incentive Plan | Share-Based Payment Arrangement, Employee |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Restricted stock issued (in shares) | 4,620 |  |  |
Shares issued, price per share (in shares) | $ 153.81 |  |  |
Restricted Stock | Non-Employee Director Equity Incentive Plan | Immediate Vesting |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Vesting, percentage |  | 50.00% |  |
Restricted Stock | Non-Employee Director Equity Incentive Plan | Anniversary of Grant Date |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Vesting, percentage |  | 50.00% |  |

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