Investment in Nikola - Additional Information (Detail) - Nikola Corporation - USD ($)		3 Months Ended
	Jun. 03, 2020	Nov. 30, 2020	Aug. 31, 2020
Marketable Securities [Line Items]
Marketable securities effective date		Jun. 03, 2020
Marketable securities number of shares owned	19,048,020
Marketable securities pre-tax earnings			$ 796,141,000
Marketable securities realized pre-tax gain		$ 652,362,000	$ 508,511,000
Number of shares sold			11,500,000
Number of shares contributed			500,000
Marketable securities unrealized market to market gain			$ 287,630,000
Marketable securities market price dropped per share		$ 20.41
Marketable securities unrealized market to market loss		$ 143,780,000
Number of shares of common stock marketable securities		7,048,020	7,048,020
Market price		$ 20.41	$ 40.81
Incremental expenses on gains from marketable securities		$ 4,570,000	$ 49,511,000
Profit sharing and bonus expense on marketable securities gain			28,858,000
Marketable securities contribution expense			$ 20,653,000
Number of shares contributed of marketable securities			500,000