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Contract Revenue and Pass-through and Other Revenue - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Disaggregation Of Revenue [Line Items] |  |  |
Deferred Revenue | $ 9.6 |  |
Deferred revenue recognized | 11.4 | $ 3.0 |
Lease revenue | $ 123.0 | $ 144.7 | $ 158.4
Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration] | Contract revenue | Contract revenue | Contract revenue
CRJ-700 |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Operating lease, term of contract | 9 years |  |

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