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Long-Term Obligations and Commitments - Narrative (Details) - USD ($)
12 Months Ended
May 02, 2019
Feb. 19, 2019
Jul. 31, 2019
Jul. 31, 2018
Jul. 31, 2017
Debt Instrument [Line Items]          
Long-term debt     $ 386,000,000 $ 388,000,000  
Short-term debt     50,000,000 50,000,000  
Interest paid     17,000,000 19,000,000 $ 42,000,000
Term Loan          
Debt Instrument [Line Items]          
Interest paid     15,000,000 13,000,000 11,000,000
Line of Credit | Revolving Credit Facility          
Debt Instrument [Line Items]          
Interest paid     0 $ 5,000,000 $ 1,000,000
May 2, 2019 Credit Agreement | Line of Credit          
Debt Instrument [Line Items]          
Aggregate principal amount $ 1,400,000,000        
May 2, 2019 Credit Agreement | Line of Credit | Term Loan          
Debt Instrument [Line Items]          
Term loan, increase limit $ 400,000,000        
May 2, 2019 Credit Agreement | Line of Credit | Term Loan | Minimum | Base Rate          
Debt Instrument [Line Items]          
Basis spread on variable rate 0.00%        
May 2, 2019 Credit Agreement | Line of Credit | Term Loan | Minimum | London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
Basis spread on variable rate 0.625%        
May 2, 2019 Credit Agreement | Line of Credit | Term Loan | Maximum | Base Rate          
Debt Instrument [Line Items]          
Basis spread on variable rate 0.125%        
May 2, 2019 Credit Agreement | Line of Credit | Term Loan | Maximum | London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
Basis spread on variable rate 1.125%        
May 2, 2019 Credit Agreement | Line of Credit | Revolving Credit Facility          
Debt Instrument [Line Items]          
Revolving credit facility $ 1,000,000,000        
May 2, 2019 Credit Agreement | Line of Credit | Revolving Credit Facility | Minimum | Base Rate          
Debt Instrument [Line Items]          
Basis spread on variable rate 0.00%        
May 2, 2019 Credit Agreement | Line of Credit | Revolving Credit Facility | Minimum | London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
Basis spread on variable rate 0.69%        
May 2, 2019 Credit Agreement | Line of Credit | Revolving Credit Facility | Maximum | Base Rate          
Debt Instrument [Line Items]          
Basis spread on variable rate 0.10%        
May 2, 2019 Credit Agreement | Line of Credit | Revolving Credit Facility | Maximum | London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
Basis spread on variable rate 1.10%        
May 2, 2019 Credit Agreement | Unsecured Debt | Term Loan          
Debt Instrument [Line Items]          
Aggregate principal amount $ 400,000,000        
Revolving credit facility 400,000,000        
Quarterly principal payments $ 12,500,000        
Long-term debt     388,000,000    
Short-term debt     50,000,000    
Secured Revolving Credit Facility | Line of Credit | Revolving Credit Facility | Subsidiary          
Debt Instrument [Line Items]          
Revolving credit facility   $ 300,000,000      
Credit facility, term   2 years      
Interest accrual, unused portion   0.50%      
Prepayments fee, percentage   1.00%      
Amount outstanding under credit facility     $ 48,000,000    
Weighted-average interest rate     7.75%    
Amounts secured on outstanding balance     $ 89,000,000    
Interest paid     $ 1,000,000    
Secured Revolving Credit Facility | Line of Credit | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Subsidiary          
Debt Instrument [Line Items]          
Basis spread on variable rate   2.39%