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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) Air-craft | Dec. 31, 2020 USD ($) | Sep. 30, 2021 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |
Deferred revenue | $ 4.2 |  |
Lease incentive assets | 14.4 |  |
Lease incentive obligations | 10.9 |  |
Amounts deferred for supplemental rent payments | 1.4 |  |
Current and non-current deferred credit balances | 4.6 |  | $ 4.8
Recognized deferred credits within contract revenue | 0.2 | $ 0.8 |
Amortization of heavy maintenance and major overhaul costs charged to depreciation and amortization expense | 0.2 | 0.0 |
Deferred heavy maintenance balance, net of accumulated amortization | 3.3 |  | $ 3.5
Engine overhaul expense | 5.3 | 14.4 |
Engine overhaul pass-through expense | 3.8 | 9.6 |
Airframe check expense | 9.1 | 10.1 |
Airframe check pass-through expense | $ 0.0 | 7.1 |
Aircraft [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Percentage leased | 10.00% |  |
GoJet Agreements [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Lease revenue recognized | $ 6.4 |  |
CRJ 700 [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of aircraft to be leased | Air-craft | 17 |  |
Operating lease, term of contract | 9 years |  |
Contract Revenue [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Lease revenue | $ 40.3 | $ 49.5 |

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