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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 31, 2023 USD ($) AirCraft | Jan. 31, 2023 AirCraft | Mar. 31, 2023 USD ($) | Mar. 31, 2022 USD ($) | Mar. 31, 2023 USD ($) AirCraft | Mar. 31, 2022 USD ($) | Sep. 30, 2022 USD ($) AirCraft
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Deferred revenue |  |  | $ 5.7 |  | $ 0.4 |  |
Lease revenue |  |  | $ 38.0 | $ 39.5 | $ 79.1 | $ 79.8 |
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 |  |
Number of air craft leased from third parties | AirCraft |  |  |  |  | 18 |  |
Current and non-current deferred credit contract liability balances | $ 3.8 |  | $ 3.8 |  | $ 3.8 |  | $ 3.9
Recognized deferred credits within contract revenue |  |  | 1.3 | 0.2 | 1.5 | 0.4 |
Amortization of heavy maintenance and major overhaul costs charged to depreciation and amortization expense |  |  | 0.8 | 0.4 | 1.6 | 0.6 |
Deferred heavy maintenance balance, net of accumulated amortization | $ 9.5 |  | 9.5 |  | 9.5 |  | $ 9.7
Engine overhaul expense |  |  | 8.1 | 4.8 | 16.8 | 10.1 |
Engine overhaul pass-through expense |  |  | 8.0 | 4.6 | 16.6 | 8.4 |
Airframe check expense |  |  | 3.8 | 4.7 | 8.8 | 13.8 |
Airframe check pass-through expense |  |  | $ 1.9 | $ 0.5 | $ 6.3 | $ 0.5 |
CRJ 700 [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Number of aircraft to be leased | AirCraft |  |  |  |  | 20 |  | 20
Operating lease, term of contract | 9 years |  | 9 years |  | 9 years |  |
Number of aircraft sold | AirCraft |  | 8 |  |  |  |  |
CRJ 700 [Member] | GoJet Agreements [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Number of aircraft classified as assets held for sale | AirCraft |  |  |  |  |  |  | 18
Number of aircraft sold | AirCraft | 18 |  |  |  |  |  |

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