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Subsequent Events - Additional Information (Detail) $ in Thousands |  |  |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 04, 2025 | Apr. 03, 2025 USD ($) Airframes Engine AirCraft | Mar. 18, 2025 | Dec. 31, 2024 USD ($) AirCraft | Dec. 24, 2024 USD ($) Airframes | Dec. 23, 2024 USD ($) | Oct. 01, 2024 USD ($) Airframes AirCraft | Sep. 30, 2024 USD ($) Engines | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Dec. 30, 2024 USD ($)
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net (loss) income |  |  |  |  |  |  |  | $ 91,015 | $ 120,116 | $ 182,678 |
Impairment loss |  |  |  |  |  |  |  | $ 73,700 | $ 50,600 | $ 62,100 |
Number of engines to be sold | Engines |  |  |  |  |  |  |  | 55 |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of increase in CPA block hour rates | 3.00% |  |  |  |  |  |  |  |  |  |
Number of engines to be sold | Engine |  | 23 |  |  |  |  |  |  |  |  |
Remaining balance |  |  |  |  |  |  | $ 73,400 |  |  |  |
Subsequent Event [Member] | United Capacity Purchase Agreement [Member] | United Airlines, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock issued equivalent percentage of issued and outstanding capital stock | 6.00% |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Engines Held For Sale [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment loss |  | $ 14,700 |  |  |  |  | 25,400 |  |  |  |
Subsequent Event [Member] | United Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loan balance forgiven |  |  |  |  |  |  |  |  |  |  | $ 4,500
Subsequent Event [Member] | E-175 Aircraft [Member] | Aircraft Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Expected gross proceeds from sale of asset |  |  |  | $ 227,700 |  |  |  |  |  |  |
Expected proceeds from sale of asset |  |  |  | $ 84,700 |  |  |  |  |  |  |
Number of aircraft sold | AirCraft |  |  |  | 18 |  |  |  |  |  |  |
Subsequent Event [Member] | E-175 Aircraft [Member] | United Aircraft Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Expected gross proceeds from sale of asset |  |  |  |  |  |  | $ 84,700 |  |  |  |
Expected proceeds from sale of asset |  | $ 16,300 |  |  |  |  |  |  |  |  |
Number of aircraft classified as assets held for sale | AirCraft |  |  |  | 18 |  |  | 18 |  |  |  |
Gross proceeds from sale of asset |  |  |  |  |  |  | $ 227,700 |  |  |  |
Number of aircraft sold | AirCraft |  | 23 |  |  |  |  |  |  |  |  |
Net (loss) income |  |  |  |  |  |  | $ 120,600 |  |  |  |
Subsequent Event [Member] | CRJ-900 Airframes [Member] | Airframe Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of aircraft classified as assets held for sale | Airframes |  |  |  |  | 29 |  |  |  |  |  |
Gross proceeds from sale of asset |  | $ 9,100 |  |  |  | $ 19,000 |  |  |  |  |
Number of aircraft sold | Airframes |  | 14 |  |  | 15 |  | 4 |  |  |  |
Impairment loss |  |  |  |  | $ 6,700 |  |  |  |  |  |
Subsequent Event [Member] | CRJ-700 Aircraft [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from sale of asset |  |  |  |  |  |  | $ 11,000 |  |  |  |
Proceeds from sale of asset |  |  |  |  |  |  | $ 6,800 |  |  |  |
Number of aircraft sold | AirCraft |  |  |  |  |  |  | 2 |  |  |  |
Subsequent Event [Member] | CF34-8C Engines [Member] | Airframe Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of aircraft sold | Airframes |  |  |  |  |  |  | 18 |  |  |  |
Subsequent Event [Member] | UST Loan [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Minimum collateral coverage ratio |  |  |  |  |  | 1.55 |  |  |  |  |
Subsequent Event [Member] | UST Loan [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Minimum collateral coverage ratio |  |  | 0.91 |  |  | 0.99 |  |  |  |  |
Subsequent Event [Member] | UST Loan [Member] | Aircraft Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from sale of asset |  |  |  |  |  |  | $ 22,400 |  |  |  |
Repayments of debt |  |  |  |  |  |  | $ 21,000 |  |  |  |
Subsequent Event [Member] | UST Loan [Member] | CRJ-900 Airframes [Member] | Airframe Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from sale of asset |  | $ 28,100 |  |  |  |  |  |  |  |  |

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