Investment in Nikola - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Jun. 03, 2020	Feb. 28, 2022	Feb. 28, 2021	Feb. 28, 2022	Feb. 28, 2021
Marketable Securities [Line Items]
Proceeds from sale of Nikola shares		$ 0	$ 146,590	$ 0	$ 634,449
Gains on investment in Nikola		0	2,740	0	655,102
Charitable contribution of Nikola shares		$ 0	0	$ 0	20,653
Nikola Corporation
Marketable Securities [Line Items]
Marketable securities effective date				Jun. 03, 2020
Marketable securities number of shares owned	19,048,020
Proceeds from sale of Nikola shares					634,449
Gains on investment in Nikola					655,102
Incremental expenses on gains from marketable securities					53,300
Profit sharing and bonus expense on marketable securities gain					32,647
Charitable contribution of Nikola shares					20,653
Marketable securities contribution expense			$ 20,653		$ 20,653