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Fair Value and Carrying Value of Financial Instruments and Long-Term Debt (Detail) (USD $)
In Thousands, unless otherwise specified
Aug. 31, 2014
May 31, 2014
Aug. 31, 2013
May 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents, carrying value $ 225,025 $ 332,868 $ 204,903 $ 343,554
Marketable equity securities, carrying value 118,806 119,800    
Marketable debt securities, carrying value 22,258 23,080    
Long-term debt, including current portion, carrying value 1,478,026 1,351,627    
Cash and cash equivalents, fair value 225,025 332,868    
Marketable securities, fair value 141,064 142,880    
Long-term debt, including current portion, fair value 1,575,909 1,516,062    
Equity securities
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Marketable securities, fair value 118,806 119,800    
Fixed maturity
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Marketable securities, fair value $ 22,258 $ 23,080