Restructuring and Other Expense, Net - Schedule of Progression of Liabilities Associated with Restructuring Activities, Combined with Reconciliation to Restructuring and Other Expense (Income), Net (Detail) - USD ($) $ in Thousands	3 Months Ended
	Aug. 31, 2019	Aug. 31, 2018
Restructuring Cost and Reserve [Line Items]
Beginning Balance	$ 776
Expense (income)	(26)
Payments	(567)
Adjustments	18
Ending Balance	201
Net loss on sale of assets	481
Restructuring and other expense (income), net	455	$ (936)
Early Retirement And Severance
Restructuring Cost and Reserve [Line Items]
Beginning Balance	774
Expense (income)	0
Payments	(566)
Adjustments	(8)
Ending Balance	200
Facility Exit And Other Costs
Restructuring Cost and Reserve [Line Items]
Beginning Balance	2
Expense (income)	(26)
Payments	(1)
Adjustments	26
Ending Balance	$ 1