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Current Liabilities - Narrative (Details)
6 Months Ended
May 02, 2019
USD ($)
extension
Jan. 31, 2020
USD ($)
Jan. 31, 2019
USD ($)
Jul. 31, 2019
USD ($)
Debt Instrument [Line Items]        
Short-term debt   $ 38,000,000   $ 50,000,000
Amendment to Master Credit Agreement        
Debt Instrument [Line Items]        
Master credit agreement $ 1,400,000,000      
Amendment to Master Credit Agreement | Term Loan        
Debt Instrument [Line Items]        
Interest paid   6,000,000 $ 7,000,000  
Amendment to Master 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      
Amendment to Master Credit Agreement | Line of Credit | Term Loan        
Debt Instrument [Line Items]        
Line of credit, maximum borrowing capacity $ 400,000,000      
Unsecured term loan   363,000,000    
Short-term debt   38,000,000    
Amendment to Master Credit Agreement | Line of Credit | Term Loan | Base Rate | Minimum        
Debt Instrument [Line Items]        
Basis spread on variable rate 0.00%      
Amendment to Master Credit Agreement | Line of Credit | Term Loan | Base Rate | Maximum        
Debt Instrument [Line Items]        
Basis spread on variable rate 0.125%      
Amendment to Master Credit Agreement | Line of Credit | Term Loan | LIBOR | Minimum        
Debt Instrument [Line Items]        
Basis spread on variable rate 0.625%      
Amendment to Master Credit Agreement | Line of Credit | Term Loan | LIBOR | Maximum        
Debt Instrument [Line Items]        
Basis spread on variable rate 1.125%      
Amendment to Master 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 $ 0  
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%      
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%      
Amendment to Master Credit Agreement | Line of Credit | Revolving Credit Facility | LIBOR | Minimum        
Debt Instrument [Line Items]        
Basis spread on variable rate 0.69%      
Amendment to Master Credit Agreement | Line of Credit | Revolving Credit Facility | LIBOR | Maximum        
Debt Instrument [Line Items]        
Basis spread on variable rate 1.10%