Restructuring and Other Expense (Income), 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		9 Months Ended
	Feb. 29, 2020	Feb. 28, 2019	Feb. 29, 2020	Feb. 28, 2019
Restructuring Cost and Reserve [Line Items]
Beginning Balance			$ 776
Expense (income)			1,450
Payments			(1,084)
Adjustments			(8)
Ending Balance	$ 1,134		1,134
Net loss on sale of assets			331
Restructuring and other expense, net	1,376	$ (11,176)	1,781	$ (11,710)
Early Retirement And Severance
Restructuring Cost and Reserve [Line Items]
Beginning Balance			774
Expense (income)			1,309
Payments			(860)
Adjustments			(89)
Ending Balance	1,134		1,134
Facility Exit And Other Costs
Restructuring Cost and Reserve [Line Items]
Beginning Balance			2
Expense (income)			141
Payments			(224)
Adjustments			81
Ending Balance	$ 0		$ 0