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		6 Months Ended
	Nov. 30, 2020	Nov. 30, 2019	Nov. 30, 2020	Nov. 30, 2019
Restructuring Cost and Reserve [Line Items]
Beginning Balance			$ 6,692
Expense (income)			2,372
Payments			(6,859)
Adjustments			(25)
Ending Balance	$ 2,180		2,180
Net (gain) loss on sale of assets			7,072
Restructuring and other expense (income), net	7,596	$ (50)	9,444	$ 405
Early Retirement And Severance
Restructuring Cost and Reserve [Line Items]
Beginning Balance			6,536
Expense (income)			1,227
Payments			(5,637)
Adjustments			(99)
Ending Balance	2,027		2,027
Facility Exit And Other Costs
Restructuring Cost and Reserve [Line Items]
Beginning Balance			156
Expense (income)			1,145
Payments			(1,222)
Adjustments			74
Ending Balance	$ 153		$ 153