Investment in Nikola - Additional Information (Detail) - USD ($)		3 Months Ended				9 Months Ended
	Nov. 30, 2020	Aug. 31, 2021	Feb. 28, 2021	Aug. 31, 2020	Feb. 29, 2020	Feb. 28, 2021	Feb. 29, 2020
Marketable Securities [Line Items]
Gains on investment in Nikola			$ 2,740,000		$ 0	$ 655,102,000	$ 0
Proceeds from sale of Nikola shares			146,590,000		0	634,449,000	0
Charitable contribution of Nikola shares			0		$ 0	20,653,000	$ 0
Nikola Corporation
Marketable Securities [Line Items]
Marketable securities effective date				Jun. 03, 2020
Marketable securities number of shares owned				19,048,020
Marketable securities number of shares sold or contributed	12,000,000
Number of shares sold		7,048,020
Gross proceeds from the sale of common stock		$ 146,590,000
Marketable securities pre-tax earnings		$ 2,740,000
Gains on investment in Nikola						655,102,000
Proceeds from sale of Nikola shares						634,449,000
Charitable contribution of Nikola shares						20,653,000
Incremental expenses on gains from marketable securities						53,300,000
Profit sharing and bonus expense on marketable securities gain						32,647,000
Marketable securities contribution expense			$ 20,653,000			$ 20,653,000