Acquisition, Restructuring and Other Items, Net - Narrative (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]
Acquisition, restructuring and other items, net	$ 1,565	$ 2,550	$ 4,486	$ 9,700
Legal
Restructuring Cost and Reserve [Line Items]
Acquisition, restructuring and other items, net	$ 637	$ 1,778	1,989	$ 5,524
Biolitec Bankruptcy
Restructuring Cost and Reserve [Line Items]
Proceeds from Legal Settlements			$ 400