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Contract Revenue and Pass-through and Other Revenue - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Mar. 31, 2025 | Mar. 31, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Deferred revenue recognized | $ 0.7 |  |  | $ 5.0 |  | $ 11.4 | $ 3.0 |
Lease revenue | $ 5.7 |  | $ 33.7 | $ 25.9 | $ 68.6 | $ 123.0 | $ 144.7 | $ 158.4
Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Revenue from Contract with Customer, Excluding Assessed Tax |  |  | Revenue from Contract with Customer, Excluding Assessed Tax | Revenue from Contract with Customer, Excluding Assessed Tax | Revenue from Contract with Customer, Excluding Assessed Tax | Revenue from Contract with Customer, Excluding Assessed Tax
CRJ-700 |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Operating lease, term of contract |  |  |  |  |  | 9 years |  |

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