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Long-Term Obligations and Commitments - Long-Term Debt (Details) - USD ($)
12 Months Ended
Feb. 01, 2016
Jul. 31, 2018
Jul. 31, 2017
Jul. 31, 2016
Debt Instrument [Line Items]        
Short-term debt   $ 50,000,000 $ 50,000,000  
Interest paid   19,000,000 42,000,000 $ 37,000,000
Term Loan        
Debt Instrument [Line Items]        
Interest paid   13,000,000 $ 11,000,000 $ 4,000,000
February 1, 2016 Credit Agreement        
Debt Instrument [Line Items]        
Credit facility, term 5 years      
Master credit agreement principal amount $ 1,500,000,000      
February 1, 2016 Credit Agreement | Line of Credit        
Debt Instrument [Line Items]        
Periodic payment, principal, percent 2.50%      
February 1, 2016 Credit Agreement | Term Loan | Line of Credit        
Debt Instrument [Line Items]        
Term loan amount outstanding $ 500,000,000 438,000,000    
Term loan, increase limit $ 500,000,000      
Short-term debt   $ 50,000,000    
February 1, 2016 Credit Agreement | Term Loan | Line of Credit | Minimum | Base Rate        
Debt Instrument [Line Items]        
Basis spread on variable rate 0.125%      
February 1, 2016 Credit Agreement | Term Loan | Line of Credit | Minimum | London Interbank Offered Rate (LIBOR)        
Debt Instrument [Line Items]        
Basis spread on variable rate 1.125%      
February 1, 2016 Credit Agreement | Term Loan | Line of Credit | Maximum | Base Rate        
Debt Instrument [Line Items]        
Basis spread on variable rate 0.875%      
February 1, 2016 Credit Agreement | Term Loan | Line of Credit | Maximum | London Interbank Offered Rate (LIBOR)        
Debt Instrument [Line Items]        
Basis spread on variable rate 1.875%