Other (Income) Expense, Net (Detail) - USD ($) $ in Thousands	3 Months Ended
	Aug. 31, 2021	Aug. 31, 2020
Other Income And Expenses [Abstract]
Pension non-service (credits)/costs	$ (2,723)	$ 3,336
Other	(616)	(218)
Other expense, net	$ (3,339)	$ 3,118