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Long-Term Debt, Derivatives and Letters of Credit - Amounts Recognized in Other Comprehensive Income, and Reclassified Into Income (Detail) - USD ($)
$ in Thousands
3 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Recognized in Other Comprehensive Income $ (238) $ 597
Net Investment Hedge [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Recognized in Other Comprehensive Income (238) 597
Gain (Loss) Reclassified from Other Comprehensive Income to Earnings $ 0 $ 0