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Long-Term Obligations and Commitments - Long Term Debt (Details) - USD ($)
3 Months Ended
May 02, 2019
Oct. 31, 2019
Oct. 31, 2018
Jul. 31, 2019
Debt Instrument [Line Items]        
Short-term debt   $ 50,000,000   $ 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   3,000,000 $ 4,000,000  
Amendment to Master Credit Agreement | Term Loan | Line of Credit        
Debt Instrument [Line Items]        
Line of credit, maximum borrowing capacity 400,000,000      
Unsecured term loan   375,000,000    
Term Loan, increase limit 400,000,000      
Short-term debt   $ 50,000,000    
Quarterly principal payment $ 12,500,000      
Amendment to Master Credit Agreement | Term Loan | Line of Credit | Base Rate | Minimum        
Debt Instrument [Line Items]        
Basis spread on variable rate 0.00%      
Amendment to Master Credit Agreement | Term Loan | Line of Credit | Base Rate | Maximum        
Debt Instrument [Line Items]        
Basis spread on variable rate 0.125%      
Amendment to Master Credit Agreement | Term Loan | Line of Credit | LIBOR | Minimum        
Debt Instrument [Line Items]        
Basis spread on variable rate 0.625%      
Amendment to Master Credit Agreement | Term Loan | Line of Credit | LIBOR | Maximum        
Debt Instrument [Line Items]        
Basis spread on variable rate 1.125%