Restructuring and Other Expense (Income), Net - Schedule of Progression of Liabilities Associated with Restructuring Activities, Combined with Reconciliation to Restructuring and Other Income, Net (Detail) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2020	May 31, 2019	May 31, 2018
Restructuring Cost and Reserve [Line Items]
Beginning Balance	$ 776	$ 1,116
Expense (income)	9,925	2,402
Payments	(3,975)	(2,440)
Adjustments	(34)	(302)
Ending Balance	6,692	776	$ 1,116
Net (gain) loss on sale of assets	123	(13,420)
Restructuring and other expense (income), net	10,048	(11,018)	(7,421)
Early Retirement And Severance
Restructuring Cost and Reserve [Line Items]
Beginning Balance	774	1,116
Expense (income)	9,096	1,899
Payments	(3,245)	(2,127)
Adjustments	(89)	(114)
Ending Balance	6,536	774	$ 1,116
Facility Exit And Other Costs
Restructuring Cost and Reserve [Line Items]
Beginning Balance	2
Expense (income)	829	503
Payments	(730)	(313)
Adjustments	55	(188)
Ending Balance	$ 156	$ 2