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Short Term Borrowings and Credit Lines - Additional Information (Detail) - USD ($)
12 Months Ended
May 31, 2017
May 31, 2016
Aug. 28, 2015
Short-term Debt [Line Items]      
Notes payable $ 325,000,000 $ 1,000,000  
Commercial paper      
Short-term Debt [Line Items]      
Notes payable 325,000,000 $ 0  
Borrowing capacity $ 2,000,000,000    
Notes payable - interest rate 0.86% 0.00%  
Revolving Credit Facility      
Short-term Debt [Line Items]      
Borrowing capacity     $ 2,000,000,000
Line of credit facility extension period after maturity 1 year    
Revolving credit facility, fee 0.045%    
Line of credit facility, amount outstanding $ 0 $ 0  
Sojitz America | Interest Bearing Accounts Payable      
Short-term Debt [Line Items]      
Accounts payable, due date period (in days) 60 days    
60-day London Interbank Offered Rate (LIBOR) | Interest Bearing Accounts Payable      
Short-term Debt [Line Items]      
Basis spread on variable rate, above LIBOR 0.75%    
London Interbank Offered Rate (LIBOR) | Revolving Credit Facility      
Short-term Debt [Line Items]      
Basis spread on variable rate, above LIBOR 0.455%