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Assets Held for Sale - Additional Information (Detail) $ in Thousands |  | 3 Months Ended |
--- | --- | --- | ---
Jul. 01, 2025 Engine | Jun. 30, 2025 USD ($) Airframes Engines | Mar. 31, 2025 Engines Airframes | Sep. 30, 2024 USD ($)
Long Lived Assets Held For Sale [Line Items] |  |  |  |
Aircraft held for sale current | $ |  | $ 60,311 |  | $ 5,741
Current Assets [Member] |  |  |  |
Long Lived Assets Held For Sale [Line Items] |  |  |  |
Aircraft held for sale current | $ |  | $ 60,300 |  |
Airframes [Member] |  |  |  |
Long Lived Assets Held For Sale [Line Items] |  |  |  |
Number of aircraft held for sale | Airframes |  | 21 | 27 |
Engines [Member] |  |  |  |
Long Lived Assets Held For Sale [Line Items] |  |  |  |
Number of aircraft held for sale | Engines |  | 34 | 46 |
CRJ-900 Airframes [Member] |  |  |  |
Long Lived Assets Held For Sale [Line Items] |  |  |  |
Number of aircraft held for sale | Airframes |  | 6 |  |
GE Model CF34-8C [Member] |  |  |  |
Long Lived Assets Held For Sale [Line Items] |  |  |  |
Number of engine sold | Engines |  | 13 |  |
GE Model CF34-8C [Member] | Subsequent Event [Member] |  |  |  |
Long Lived Assets Held For Sale [Line Items] |  |  |  |
Number of engine sold | Engine | 8 |  |  |

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- Definition Amount of assets held-for-sale that are not part of a disposal group, expected to be sold within a year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 852 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481372/852-10-55-10 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 15 -Paragraph 4 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482309/360-10-15-4 + Details
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