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Subsequent Events - Additional Information (Detail) |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
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Apr. 04, 2025 USD ($) ENGINE | Apr. 03, 2025 USD ($) | Apr. 03, 2025 ENGINE | Apr. 03, 2025 AIRCRAFT | Apr. 03, 2025 AIRFRAMES | Mar. 18, 2025 | Dec. 31, 2024 USD ($) AIRCRAFT | Dec. 24, 2024 USD ($) AIRFRAMES | Dec. 23, 2024 USD ($) | Oct. 01, 2024 USD ($) AIRFRAMES AIRCRAFT | Dec. 31, 2015 USD ($) | Mar. 31, 2025 USD ($) AIRFRAMES AIRCRAFT | Sep. 30, 2024 USD ($) ENGINE | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Dec. 30, 2024 USD ($)
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of engines to be sold | ENGINE |  |  |  |  |  |  |  |  |  |  |  |  | 55 |  |  |
Impairment loss |  |  |  |  |  |  |  |  |  |  |  | $ 12,400,000 | $ 73,700,000 | $ 50,600,000 | $ 62,100,000 |
Engines Held For Sale [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment loss |  |  |  |  |  |  |  |  |  |  |  | $ 33,800 |  |  |  |
E-175 Aircraft [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircraft sold | AIRCRAFT |  |  |  |  |  |  |  |  |  |  |  | 18 |  |  |  |
Remaining balance |  |  |  |  |  |  |  |  |  |  | $ 73,400,000 |  |  |  |  |
C R J 900 Airframes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircraft classified as assets held for sale | AIRFRAMES |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |
CRJ-700 Aircraft [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircraft sold | AIRCRAFT |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
CF34-8C Engines [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircraft classified as assets held for sale | AIRCRAFT |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |
UST Loan [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum collateral coverage ratio |  |  |  |  |  | 0.91 |  |  | 0.99 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  | $ 73,400,000 |  |  |  |  |  |
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 Held For Sale |  | $ 14,700,000 |  |  |  |  |  |  |  | $ 25,400,000 |  |  |  |  |  |
Subsequent Event [Member] | United Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan balance forgiven |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,500,000
Subsequent Event [Member] | E-175 Aircraft [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircraft sold | AIRCRAFT |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Subsequent Event [Member] | E-175 Aircraft [Member] | Aircraft Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected gross proceeds from sale of asset |  |  |  |  |  |  | $ 227,700,000 |  |  |  |  |  |  |  |  |
Expected proceeds from sale of asset |  |  |  |  |  |  | $ 84,700,000 |  |  |  |  |  |  |  |  |
Number of aircraft classified as assets held for sale | AIRCRAFT |  |  |  |  |  |  |  |  |  | 18 |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  | $ 84,700,000 |  |  | $ 227,700,000 |  |  |
Expected proceeds from sale of asset |  | 16,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircraft classified as assets held for sale | AIRCRAFT |  |  |  |  |  |  | 18 |  |  | 18 |  |  |  |  |  |
Gross proceeds from sale of asset |  |  |  |  |  |  |  |  |  | $ 120,600,000 |  |  |  |  |  |
Number of aircraft sold | AIRCRAFT |  |  |  | 23 |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | C R J 900 Airframes [Member] | Aircraft Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircraft sold | AIRFRAMES |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |
Subsequent Event [Member] | C R J 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 |  | 9,100,000 |  |  |  |  |  |  | $ 19,000,000 |  |  |  |  |  |  |
Number of aircraft sold |  |  | 14 |  | 14 |  |  | 15 |  |  |  |  |  |  |  |
Impairment loss |  |  |  |  |  |  |  | $ 6,700,000 |  |  |  |  |  |  |  |
Subsequent Event [Member] | CRJ-700 Aircraft [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from sale of asset |  |  |  |  |  |  |  |  |  | $ 11,000,000 |  |  |  |  |  |
Net proceeds from sale of asset |  |  |  |  |  |  |  |  |  | $ 6,800,000 |  |  |  |  |  |
Subsequent Event [Member] | CF34-8C Engines [Member] | Airframe Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircraft sold | AIRFRAMES |  |  |  |  |  |  |  |  |  | 18 |  |  |  |  |  |
Subsequent Event [Member] | C F34 8CEngine [Member] | United Aircraft Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected proceeds from sale of asset |  | 16,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircraft sold | ENGINE |  |  | 23 |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | UST Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from sale of asset | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum collateral coverage ratio |  |  |  |  |  |  |  |  | 1.55 |  |  |  |  |  |  |
Number of engine sold | ENGINE | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  | $ 22,400,000 |  |  |  |  |  |
Repayments of debt |  |  |  |  |  |  |  |  |  | $ 21,000,000 |  |  |  |  |  |
Subsequent Event [Member] | UST Loan [Member] | C R J 900 Airframes [Member] | Airframe Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from sale of asset |  | $ 28,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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