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Balance Sheet Information - Additional Information (Detail) $ in Thousands	1 Months Ended		3 Months Ended		6 Months Ended
	Sep. 30, 2021 USD ($) shares	Jul. 31, 2021 USD ($)	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)	Mar. 31, 2023 USD ($) AirCraft	Mar. 31, 2022 USD ($)	Feb. 28, 2022 USD ($)	Feb. 28, 2021 USD ($)
Condensed Balance Sheet Statements Captions [Line Items]
Depreciation expense			$ 16,500	$ 20,100	$ 31,600	$ 40,600
Estimated initial equity warrant asset value								$ 16,400
Estimated initial warrant asset value							$ 3,200
Net gain/(loss) on investments in equity securities			2,100	$ (2,300)	400	(8,700)
Aggregate carrying amount of investments in equity securities			15,300		15,300
Investments without readily determinable fair value			$ 8,800		8,800
Asset impairment					20,462	$ 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 | AirCraft					14
CRJ-900 [Member] | RASPRO Aircraft Lease Agreement [Member]
Condensed Balance Sheet Statements Captions [Line Items]
Number of aircraft held for sale | AirCraft					7
Impairment loss related to the held for sale aircraft					$ 16,700

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