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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) Air-craft | Jun. 30, 2021 USD ($) | Sep. 30, 2021 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Deferred revenue | $ 6.8 |  | $ 11.8 |  |
Lease incentive assets | 15.0 |  | 15.0 |  |
Lease incentive obligations | 11.6 |  | 11.6 |  |
Amounts deferred for supplemental rent payments | 2.6 |  | 2.6 |  |
Current and non-current deferred credit contract liability balances | 4.1 |  | 4.1 |  | $ 4.8
Recognized deferred credits within contract revenue | 0.2 | $ 0.2 | 0.6 | $ 2.1 |
Amortization of heavy maintenance and major overhaul costs charged to depreciation and amortization expense | 0.5 | 0.1 | 1.2 | 0.1 |
Deferred heavy maintenance balance, net of accumulated amortization | 6.8 |  | 6.8 |  | $ 3.5
Engine overhaul expense | 8.1 | 4.0 | 18.2 | 25.3 |
Engine overhaul pass-through expense | 6.0 | 2.7 | 14.5 | 14.5 |
Airframe check expense | 5.0 | 14.1 | 18.8 | 38.3 |
Airframe check pass-through expense | 1.3 | 5.6 | $ 1.7 | 18.3 |
Aircraft [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Percentage leased |  |  | 11.00% |  |
GoJet Agreements [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Lease revenue recognized | $ 7.1 | 3.4 | $ 20.3 | 4.0 |
CRJ 700 [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Number of aircraft to be leased | Air-craft |  |  | 20 |  |
Operating lease, term of contract | 9 years |  | 9 years |  |
Contract Revenue [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Lease revenue | $ 38.7 | $ 41.2 | $ 118.5 | $ 131.8 |

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