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Contract Revenue and Pass-through and Other Revenue - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Disaggregation Of Revenue [Line Items] |  |  |
Deferred Revenue |  | $ 10.4 |
Deferred revenue recognized | $ 3.0 |  |
Lease revenue | $ 144.7 | $ 158.4 | $ 170.2
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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