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, 2019	May 31, 2018	May 31, 2017
Restructuring Cost and Reserve [Line Items]
Beginning Balance	$ 1,116
Expense (income)	2,402
Payments	(2,440)
Adjustments	(302)
Ending Balance	776	$ 1,116
Net gain on sale of assets	(13,420)
Restructuring and other expense (income), net	(11,018)	(7,421)	$ 6,411
Early Retirement And Severance
Restructuring Cost and Reserve [Line Items]
Beginning Balance	1,116
Expense (income)	1,899
Payments	(2,127)
Adjustments	(114)
Ending Balance	774	1,116
Facility Exit And Other Costs
Restructuring Cost and Reserve [Line Items]
Beginning Balance	0
Expense (income)	503
Payments	(313)
Adjustments	(188)
Ending Balance	$ 2	$ 0