Comprehensive Income (Loss) - Summary of Tax Effects on Each Component of Other Comprehensive Income (Loss) (Detail) - USD ($)	12 Months Ended
	May 31, 2020	May 31, 2019	May 31, 2018
Components Of Other Comprehensive Income Loss [Abstract]
Foreign currency translation, before tax	$ 10,480,000	$ (14,772,000)	$ 12,744,000
Foreign currency translation, tax	17,000
Foreign currency translation, net of tax	10,497,000	(14,772,000)	12,744,000
Pension liability adjustment, before tax	(5,395,000)	(2,203,000)	1,875,000
Pension liability adjustment, tax	1,365,000	418,000	(309,000)
Pension liability adjustment, net of tax	(4,030,000)	(1,785,000)	1,566,000
Cash flow hedges, before tax	2,339,000	(16,227,000)	1,351,000
Cash flow hedges, tax	(559,000)	3,780,000	(392,000)
Cash flow hedges, net of tax	1,780,000	(12,447,000)	959,000
Other comprehensive income (loss), before tax	7,424,000	(33,202,000)	15,970,000
Other comprehensive income (loss), tax	823,000	4,198,000	(701,000)
Other comprehensive income (loss)	$ 8,247,000	$ (29,004,000)	$ 15,269,000