Balance Sheet Information - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2021	Jul. 31, 2021	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Feb. 28, 2022	Feb. 28, 2021
Condensed Balance Sheet Statements Captions [Line Items]
Depreciation expense			$ 19.3	$ 20.6	$ 59.9	$ 61.2
Estimated initial equity warrant asset value								$ 16.4
Estimated initial warrant asset value							$ 3.2
Net losses on investments in equity securities			3.9		12.6
Aggregate carrying amount of investments in equity securities			16.0		16.0
Investments without readily determinable fair value			$ 9.6		$ 9.6
Heart Aerospace Incorporated [Member] | Forward Purchase Contract [Member] | Preferred Stock [Member]
Condensed Balance Sheet Statements Captions [Line Items]
Purchase of preferred stock		$ 5.0
Initial investment in preferred stock measured at cost		$ 5.0
Class A [Member] | Archer Aviation, Inc. [Member]
Condensed Balance Sheet Statements Captions [Line Items]
Stock issued during period, Shares	500,000
Stock issued during period, Value	$ 5.0
Total grant date value, Additional warrant to purchase shares	$ 5.6