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Assets Held for Sale - Additional Information (Detail) |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 11, 2024 AirCraft | Dec. 01, 2023 USD ($) Engine | Oct. 01, 2023 USD ($) AirCraft Engine | Jan. 31, 2023 USD ($) AirCraft | Sep. 30, 2023 USD ($) AirCraft | Sep. 30, 2022 USD ($) AirCraft
Long Lived Assets Held For Sale [Line Items] |  |  |  |  |  |
Asset impairment |  |  |  |  | $ 54,343,000 | $ 171,824,000
Aircraft held for sale current |  |  |  |  | 57,722,000 |
Aircraft held for sale |  |  |  |  | $ 12,000,000 | $ 73,000,000
Subsequent Event [Member] |  |  |  |  |  |
Long Lived Assets Held For Sale [Line Items] |  |  |  |  |  |
Number of aircraft sold | AirCraft | 4 |  |  |  |  |
Gross proceeds from sale of asset |  | $ 56,000,000 | $ 56,000,000 |  |  |
Number of surplus engines to be sold | Engine |  | 12 | 12 |  |  |
Payment of debt and liquidity to fund operations and current debt obligations |  | $ 40,000,000 | $ 40,000,000 |  |  |
CRJ-700 |  |  |  |  |  |
Long Lived Assets Held For Sale [Line Items] |  |  |  |  |  |
Number of aircraft held for sale | AirCraft |  |  |  |  |  | 8
Number of aircraft leased to third party | AirCraft |  |  |  |  | 2 |
Number of aircraft sold | AirCraft |  |  |  |  | 8 |
Gross proceeds from sale of asset |  |  |  |  | $ 40,000,000 |
Proceeds from sale of asset |  |  |  |  | $ 8,000,000 |
CRJ-900 [Member] |  |  |  |  |  |
Long Lived Assets Held For Sale [Line Items] |  |  |  |  |  |
Number of aircraft held for sale | AirCraft |  |  |  |  | 15 | 11
Number of aircraft eligible to be classified as assets held for sale | AirCraft |  |  |  |  | 14 |
Asset impairment |  |  |  |  | $ 0 |
Number of aircraft sold | AirCraft |  |  |  | 4 | 7 |
Gross proceeds from sale of asset |  |  |  | $ 12,000,000 | $ 21,000,000 |
Proceeds from sale of asset |  |  |  |  | 1,500,000 |
Assets held for sale with a net book value |  |  |  |  | 69,700,000 |
Aircraft held for sale current |  |  |  |  | 57,700,000 |
Aircraft held for sale |  |  |  |  | $ 12,000,000 |
CRJ-900 [Member] | RASPRO Aircraft Lease Agreement [Member] |  |  |  |  |  |
Long Lived Assets Held For Sale [Line Items] |  |  |  |  |  |
Number of aircraft held for sale | AirCraft |  |  |  |  | 7 |
CRJ-900 [Member] | American Airlines Inc. [Member] |  |  |  |  |  |
Long Lived Assets Held For Sale [Line Items] |  |  |  |  |  |
Number of aircraft sold | AirCraft |  |  |  |  | 3 |
Number of surplus aircraft to be sold | AirCraft |  |  |  |  | 7 |
Gross proceeds from sale of asset |  |  |  |  | $ 29,700,000 |
Proceeds from sale of asset |  |  |  |  | $ 2,400,000 |
CRJ-900 [Member] | American Airlines Inc. [Member] | Subsequent Event [Member] |  |  |  |  |  |
Long Lived Assets Held For Sale [Line Items] |  |  |  |  |  |
Number of aircraft sold | AirCraft |  |  | 4 |  |  |
Gross proceeds from sale of asset |  |  | $ 41,500,000 |  |  |
Proceeds from sale of asset |  |  | $ 5,700,000 |  |  |
CRJ-200 [Member] |  |  |  |  |  |
Long Lived Assets Held For Sale [Line Items] |  |  |  |  |  |
Number of aircraft held for sale | AirCraft |  |  |  |  |  | 1

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