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Accumulated Other Comprehensive Income - Related Tax Effects Allocated to Each Component of Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Components Of Other Comprehensive Income Loss [Line Items]    
Foreign currency translation adjustments, Gross Amount $ (3,977) $ (1,524)
Foreign currency translation adjustments, Tax Effect 1,281 115
Foreign currency translation adjustments, Net Amount (2,696) (1,409)
Foreign currency hedge, Gross Amount (238) 597
Foreign currency hedge, Tax Effect 91 (232)
Foreign currency hedge, Net Amount (147) 365
Other Comprehensive Income (Loss), before Tax, Total (4,215) (927)
Total other comprehensive income, Tax Effect 1,372 (117)
Total other comprehensive income, Net Amount $ (2,843) $ (1,044)