Summary of Tax Effects of Each Component of Other Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Feb. 28, 2014	Feb. 28, 2013	Feb. 28, 2014	Feb. 28, 2013
Before-Tax
Foreign currency translation, before tax	$ 3,043	$ (1,675)	$ 5,594	$ 6,400
Pension liability adjustment, before tax	691	(43)	691	(298)
Cash flow hedges, before tax	(62)	724	5,419	2,501
Other comprehensive income (loss), before tax	3,672	(994)	11,704	8,603
Tax
Foreign currency translation, tax
Pension liability adjustment, tax	(241)	15	(241)	97
Cash flow hedges, tax	(32)	113	(1,809)	(1,008)
Other comprehensive income (loss), tax	(273)	128	(2,050)	(911)
Net-of-tax
Foreign currency translation, net-of-tax	3,043	(1,675)	5,594	6,400
Pension liability adjustment, net-of-tax	450	(28)	450	(201)
Cash flow hedges, net-of-tax	(94)	837	3,610	1,493
Other comprehensive income (loss), net-of-tax	$ 3,399	$ (866)	$ 9,654	$ 7,692