Goodwill and Other Long-Lived Assets - Summary of Changes in Carrying Amount of Goodwill (Detail) (Parenthetical)	12 Months Ended
	May 31, 2020 USD ($)
Goodwill [Line Items]
Impairment losses	$ 22,097,000	[1]
Oil and Gas Equipment
Goodwill [Line Items]
Impairment losses	$ 22,097,000

[1] Fiscal 2020 impairment losses included $22,097,000 of goodwill impairment related to the oil & gas equipment reporting unit.