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Short Term Borrowings and Credit Lines - Additional Information (Detail) - USD ($)
12 Months Ended
May 31, 2016
Aug. 28, 2015
May 31, 2015
Nov. 01, 2011
Commercial Paper        
Short-term Debt [Line Items]        
Line of credit facility, amount outstanding $ 0   $ 0  
Revolving Credit Facility        
Short-term Debt [Line Items]        
Borrowing capacity $ 2,000,000,000 $ 2,000,000,000   $ 1,000,000,000
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%