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Long-Term Obligations and Commitments (Details)
9 Months Ended
Feb. 01, 2016
USD ($)
Apr. 30, 2017
USD ($)
Apr. 30, 2016
USD ($)
Jul. 31, 2016
USD ($)
Debt Instrument [Line Items]        
Long-term debt   $ 450,000,000   $ 488,000,000
Long Term Obligations (Textuals)        
Short-term debt   50,000,000   512,000,000
Other long-term obligations        
Total deferred rent   51,000,000   56,000,000
Total license fee payable   28,000,000   26,000,000
Long-term income tax liabilities   60,000,000   54,000,000
Long-term deferred income tax liabilities   6,000,000   7,000,000
Other   22,000,000   20,000,000
Total long-term obligations   167,000,000   163,000,000
Less current portion (included in other current liabilities)   (17,000,000)   (17,000,000)
Long-term obligations due after one year   150,000,000   $ 146,000,000
Term Loan        
Long Term Obligations (Textuals)        
Cash paid for interest   7,000,000 $ 1,000,000  
Line of Credit | Revolving Credit Facility        
Long Term Obligations (Textuals)        
Cash paid for interest     $ 2,000,000  
February 1, 2016 Credit Agreement        
Long Term Obligations (Textuals)        
Debt instrument, term 5 years      
Master credit agreement $ 1,500,000,000      
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      
Periodic principal payment percentage 2.50%      
February 1, 2016 Credit Agreement | Line of Credit | Term Loan        
Long Term Obligations (Textuals)        
Unsecured term loan $ 500,000,000 500,000,000    
Short-term debt   50,000,000    
Term loan, increase limit $ 500,000,000      
February 1, 2016 Credit Agreement | Line of Credit | Revolving Credit Facility        
Long Term Obligations (Textuals)        
Cash paid for interest   $ 1,000,000    
Base Rate | Minimum | February 1, 2016 Credit Agreement | Line of Credit | Term Loan        
Debt Instrument [Line Items]        
Basis spread on variable rate 0.125%      
Base Rate | Minimum | February 1, 2016 Credit Agreement | Line of Credit | Revolving Credit Facility        
Debt Instrument [Line Items]        
Basis spread on variable rate 0.00%      
Base Rate | Maximum | February 1, 2016 Credit Agreement | Line of Credit | Term Loan        
Debt Instrument [Line Items]        
Basis spread on variable rate 0.875%      
Base Rate | Maximum | February 1, 2016 Credit Agreement | Line of Credit | Revolving Credit Facility        
Debt Instrument [Line Items]        
Basis spread on variable rate 0.50%      
LIBOR | Minimum | February 1, 2016 Credit Agreement | Line of Credit | Term Loan        
Debt Instrument [Line Items]        
Basis spread on variable rate 1.125%      
LIBOR | Minimum | February 1, 2016 Credit Agreement | Line of Credit | Revolving Credit Facility        
Debt Instrument [Line Items]        
Basis spread on variable rate 0.90%      
LIBOR | Maximum | February 1, 2016 Credit Agreement | Line of Credit | Term Loan        
Debt Instrument [Line Items]        
Basis spread on variable rate 1.875%      
LIBOR | Maximum | February 1, 2016 Credit Agreement | Line of Credit | Revolving Credit Facility        
Debt Instrument [Line Items]        
Basis spread on variable rate 1.50%