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Fair Value and Carrying Value of Financial Instruments and Long-Term Debt (Detail) - USD ($)
$ in Thousands
May 31, 2018
May 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Marketable securities $ 168,071 $ 164,455
Equity securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Marketable securities 144,555 141,539
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 244,422 350,497
Long-term debt, including current portion 2,174,144 2,090,082
Carrying Value | Equity securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Marketable securities 144,555 141,539
Carrying Value | Debt securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Marketable securities 23,516 22,916
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 244,422 350,497
Long-term debt, including current portion 2,215,458 2,243,167
Fair Value | Equity securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Marketable securities 144,555 141,539
Fair Value | Debt securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Marketable securities $ 23,516 $ 22,916