Related Tax Effects Allocated to Each Components of Other Comprehensive Income (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
Components Of Other Comprehensive Income Loss [Line Items]
Foreign currency translation adjustments, Gross Amount	$ (5,415)	$ 719	$ (6,939)	$ (210)
Foreign currency translation adjustments, Tax Effect			1,336	542
Foreign currency translation adjustments, Net Amount			(5,603)	332
Foreign currency hedge, Gross Amount	842	(400)	1,439	(762)
Foreign currency hedge, Tax Effect			(559)	291
Foreign currency hedge, Net Amount			880	(471)
Other Comprehensive Income (Loss), before Tax, Total			(5,500)	(972)
Total other comprehensive income, Tax Effect	894us-gaap_OtherComprehensiveIncomeLossTax	319us-gaap_OtherComprehensiveIncomeLossTax	777us-gaap_OtherComprehensiveIncomeLossTax	833us-gaap_OtherComprehensiveIncomeLossTax
Total other comprehensive income, Net Amount			$ (4,723)	$ (139)

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

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