Summary of Tax Effects of Each Component of Other Comprehensive Income (Loss) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Nov. 30, 2014	Nov. 30, 2013	Nov. 30, 2014	Nov. 30, 2013
Before-Tax
Foreign currency translation, before tax	$ (7,270)	$ 3,037	$ (16,862)	$ 2,551
Cash flow hedges, before tax	(2,973)	661	(1,430)	5,481
Other comprehensive income (loss), before tax	(10,243)	3,698	(18,292)	8,032
Tax
Foreign currency translation, tax	0	0	0	0
Cash flow hedges, tax	1,092	(308)	510	(1,777)
Other comprehensive income (loss), tax	1,092us-gaap_OtherComprehensiveIncomeLossTax	(308)us-gaap_OtherComprehensiveIncomeLossTax	510us-gaap_OtherComprehensiveIncomeLossTax	(1,777)us-gaap_OtherComprehensiveIncomeLossTax
Net-of-tax
Foreign currency translation, net-of-tax	(7,270)	3,037	(16,862)	2,551
Cash flow hedges, net-of-tax	(1,881)	353	(920)	3,704
Other comprehensive income (loss), net-of-tax	$ (9,151)	$ 3,390	$ (17,782)	$ 6,255

Amount before tax, after reclassification adjustments of other comprehensive income (loss).

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