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Current Liabilities - Narrative (Details)
9 Months Ended
Feb. 01, 2016
USD ($)
extension
Apr. 30, 2018
USD ($)
Apr. 30, 2017
USD ($)
Jul. 31, 2017
USD ($)
Debt Instrument [Line Items]        
Short-term debt   $ 50,000,000   $ 50,000,000
Proceeds from borrowings under revolving credit facility   800,000,000 $ 150,000,000  
February 1, 2016 Credit Agreement        
Debt Instrument [Line Items]        
Debt instrument, term 5 years      
Master credit agreement $ 1,500,000,000      
February 1, 2016 Credit Agreement | Term Loan        
Debt Instrument [Line Items]        
Interest paid   9,000,000 7,000,000  
February 1, 2016 Credit Agreement | Revolving Credit Facility        
Debt Instrument [Line Items]        
Proceeds from borrowings under revolving credit facility   800,000,000    
February 1, 2016 Credit Agreement | Line of Credit        
Debt Instrument [Line Items]        
Debt to EBITDA ratio (not greater than) 3.25      
EBITDA to interest payable ratio (not less than) 3.00      
February 1, 2016 Credit Agreement | Line of Credit | Term Loan        
Debt Instrument [Line Items]        
Unsecured term loan $ 500,000,000 450,000,000    
Short-term debt   50,000,000    
February 1, 2016 Credit Agreement | Line of Credit | Term Loan | Base Rate | Minimum        
Debt Instrument [Line Items]        
Basis spread on variable rate 0.125%      
February 1, 2016 Credit Agreement | Line of Credit | Term Loan | Base Rate | Maximum        
Debt Instrument [Line Items]        
Basis spread on variable rate 0.875%      
February 1, 2016 Credit Agreement | Line of Credit | Term Loan | LIBOR | Minimum        
Debt Instrument [Line Items]        
Basis spread on variable rate 1.125%      
February 1, 2016 Credit Agreement | Line of Credit | Term Loan | LIBOR | Maximum        
Debt Instrument [Line Items]        
Basis spread on variable rate 1.875%      
February 1, 2016 Credit Agreement | Line of Credit | Revolving Credit Facility        
Debt Instrument [Line Items]        
Unsecured revolving credit facility $ 1,000,000,000      
Revolving credit facility, increase limit $ 250,000,000      
Unsecured revolving credit facility extension | extension 2      
Fair value of amount outstanding   0    
Interest paid   $ 5,000,000 $ 1,000,000  
February 1, 2016 Credit Agreement | Line of Credit | Revolving Credit Facility | Base Rate | Minimum        
Debt Instrument [Line Items]        
Basis spread on variable rate 0.00%      
February 1, 2016 Credit Agreement | Line of Credit | Revolving Credit Facility | Base Rate | Maximum        
Debt Instrument [Line Items]        
Basis spread on variable rate 0.50%      
February 1, 2016 Credit Agreement | Line of Credit | Revolving Credit Facility | LIBOR | Minimum        
Debt Instrument [Line Items]        
Basis spread on variable rate 0.90%      
February 1, 2016 Credit Agreement | Line of Credit | Revolving Credit Facility | LIBOR | Maximum        
Debt Instrument [Line Items]        
Basis spread on variable rate 1.50%