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Amounts Recognized in Other Comprehensive Income, and Reclassified into Income (Detail) (Euro denominated long-term debt, USD $)
In Thousands, unless otherwise specified
3 Months Ended
Aug. 31, 2013
Aug. 31, 2012
Euro denominated long-term debt
   
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Recognized in Other Comprehensive Income $ (362) $ (112)
Gain (Loss) Reclassified from Other Comprehensive Income to Earnings