Related Tax Effects Allocated to Each Component of Other Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Feb. 28, 2013	Feb. 29, 2012	Feb. 28, 2013	Feb. 29, 2012
Components Of Other Comprehensive Income Loss [Line Items]
Foreign currency translation adjustments, Gross Amount	$ (1,985)	$ 3,293	$ 2,305	$ (3,037)
Foreign currency translation adjustments, Tax Effect			(91)	494
Foreign currency translation adjustments, Net Amount			2,214	(2,543)
Foreign currency hedge, Gross Amount			(791)	1,164
Foreign currency hedge, Tax Effect			309	(453)
Foreign currency hedge, Net Amount			(482)	711
Other Comprehensive Income (Loss), before Tax, Total			1,514	(1,873)
Total other comprehensive income, Tax Affect	594	(754)	218	41
Total other comprehensive income, Net Amount			$ 1,732	$ (1,832)

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Before tax amount of other comprehensive income (loss) attributable to both parent entity and noncontrolling interest.

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