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Assets Held for Sale - Additional Information (Detail) $ in Thousands				3 Months Ended		12 Months Ended
	Apr. 04, 2025 USD ($) Engine	Apr. 03, 2025 Engine	Dec. 31, 2024 USD ($) AirCraft	Dec. 31, 2024 USD ($) AirCraft Engines Airframes	Dec. 31, 2023 USD ($)	Sep. 30, 2024 USD ($) Engines AirCraft Airframes	Sep. 30, 2023 USD ($) AirCraft	Sep. 30, 2022 USD ($)
Long Lived Assets Held For Sale [Line Items]
Asset impairment				$ 65,665	$ 40,384	$ 73,709	$ 54,343	$ 171,824
Impairment loss held for sale				4,900	$ 40,400	73,700	50,600	$ 62,100
Aircraft held for sale current			$ 80,723	$ 80,723		5,741	57,722
Aircraft held for sale						$ 86,605	$ 12,000
Number of engines to be sold | Engines				51
Number of airframes to be sold | Airframes				28
Subsequent Event [Member]
Long Lived Assets Held For Sale [Line Items]
Number of engine sold | Engine	13
Gross proceeds from sale of asset	$ 9,200
Number of engines to be sold | Engine		23
CRJ-900 [Member]
Long Lived Assets Held For Sale [Line Items]
Number of aircraft held for sale | Airframes				2		26
Aircraft held for sale current			$ 80,700	$ 80,700
E-175 [Member]
Long Lived Assets Held For Sale [Line Items]
Number of aircraft held for sale | AirCraft							18
E-175 [Member] | United Airlines, Inc. [Member]
Long Lived Assets Held For Sale [Line Items]
Number of aircraft held for sale | AirCraft			10	18
Number of aircraft sold | AirCraft				8
GE Model [Member]
Long Lived Assets Held For Sale [Line Items]
Number of aircraft held for sale | Engines				4		55
CRJ-700 [Member]
Long Lived Assets Held For Sale [Line Items]
Number of aircraft held for sale | AirCraft				2		2

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