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Balance Sheet Information - Additional Information (Detail) $ in Thousands	1 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) shares	Jul. 31, 2021 USD ($)	Jun. 30, 2023 USD ($) Engine	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) AirCraft	Jun. 30, 2022 USD ($)	Sep. 30, 2022 USD ($)	Feb. 28, 2022 USD ($)	Feb. 28, 2021 USD ($)
Condensed Balance Sheet Statements Captions [Line Items]
Depreciation expense			$ 15,300	$ 19,300	$ 46,900	$ 59,900
Estimated initial equity warrant asset value									$ 16,400
Estimated initial warrant asset value								$ 3,200
Net gain/(loss) on investments in equity securities			2,900	$ (3,900)	3,300	(12,600)
Aggregate carrying amount of investments in equity securities			18,200		18,200		$ 15,200
Investments without readily determinable fair value			$ 8,800		8,800		$ 9,000
Asset impairment					50,951	$ 39,475
Heart Aerospace Incorporated [Member] | Forward Purchase Contract [Member] | Preferred Stock [Member]
Condensed Balance Sheet Statements Captions [Line Items]
Purchase of preferred stock		$ 5,000
Initial investment in preferred stock measured at cost		$ 5,000
Class A [Member] | Archer Aviation, Inc. [Member]
Condensed Balance Sheet Statements Captions [Line Items]
Stock issued during period, Shares | shares	500,000
Stock issued during period, Value	$ 5,000
Total grant date value, Additional warrant to purchase shares	$ 5,600
CRJ-900 [Member]
Condensed Balance Sheet Statements Captions [Line Items]
Impairment of intangible asset					$ 3,700
Number of aircraft held for sale			7		21
Asset impairment			$ 30,500
CRJ-900 [Member] | RASPRO Aircraft Lease Agreement [Member]
Condensed Balance Sheet Statements Captions [Line Items]
Number of aircraft held for sale | AirCraft					7
CRJ-900 [Member] | Export Development Canada Aircraft Lease Agreement [Member]
Condensed Balance Sheet Statements Captions [Line Items]
Number of aircraft held for sale | AirCraft					7
CRJ-900 [Member] | RASPRO and Export Development Canada Aircraft Lease Agreement [Member]
Condensed Balance Sheet Statements Captions [Line Items]
Impairment loss related to the held for sale aircraft			$ 30,500		$ 47,200

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