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Current Liabilities - Narrative (Details)
9 Months Ended
May 02, 2019
Feb. 01, 2016
USD ($)
extension
Apr. 30, 2019
USD ($)
Apr. 30, 2018
USD ($)
Jul. 31, 2018
USD ($)
Debt Instrument [Line Items]          
Short-term debt     $ 50,000,000   $ 50,000,000
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     11,000,000 $ 9,000,000  
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]          
Line of credit, maximum borrowing capacity   $ 500,000,000      
Unsecured term loan     400,000,000    
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     $ 0 $ 5,000,000  
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%      
Subsequent event | Amendment to Master Credit Agreement | Line of Credit | Revolving Credit Facility | Base Rate | Minimum          
Debt Instrument [Line Items]          
Basis spread on variable rate 0.00%        
Subsequent event | Amendment to Master Credit Agreement | Line of Credit | Revolving Credit Facility | Base Rate | Maximum          
Debt Instrument [Line Items]          
Basis spread on variable rate 0.10%        
Subsequent event | Amendment to Master Credit Agreement | Line of Credit | Revolving Credit Facility | LIBOR | Minimum          
Debt Instrument [Line Items]          
Basis spread on variable rate 0.69%        
Subsequent event | Amendment to Master Credit Agreement | Line of Credit | Revolving Credit Facility | LIBOR | Maximum          
Debt Instrument [Line Items]          
Basis spread on variable rate 1.10%