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Current Liabilities - Additional Information (Details)
1 Months Ended 12 Months Ended
May 02, 2019
USD ($)
extension
Aug. 31, 2020
USD ($)
Jul. 31, 2020
USD ($)
Jul. 31, 2019
USD ($)
Jul. 31, 2018
USD ($)
Debt Instrument [Line Items]          
Short-term debt     $ 1,338,000,000 $ 50,000,000  
Interest paid     14,000,000 17,000,000 $ 19,000,000
Fair value of amount outstanding     1,000,000,000    
Repayments under revolving credit facility     0 0 800,000,000
Line of Credit | Revolving Credit Facility          
Debt Instrument [Line Items]          
Interest paid     2,000,000 0 5,000,000
May 2, 2019 Credit Agreement | Term Loan          
Debt Instrument [Line Items]          
Interest paid     9,000,000 $ 15,000,000 $ 13,000,000
May 2, 2019 Credit Agreement | Line of Credit          
Debt Instrument [Line Items]          
Aggregate principal amount $ 1,400,000,000        
Debt instrument, covenant, debt To EBITDA ratio, maximum 3.25        
Debt instrument, covenant, EBITDA to annual interest expense ratio, minimum 3.00        
May 2, 2019 Credit Agreement | Line of Credit | Term Loan          
Debt Instrument [Line Items]          
Term loan, increase limit $ 400,000,000        
Quarterly principal payments $ 12,500,000        
Short-term debt     $ 338,000,000    
May 2, 2019 Credit Agreement | Line of Credit | Term Loan | Base Rate | Minimum          
Debt Instrument [Line Items]          
Basis spread on variable rate 0.00%        
May 2, 2019 Credit Agreement | Line of Credit | Term Loan | Base Rate | Maximum          
Debt Instrument [Line Items]          
Basis spread on variable rate 0.125%        
May 2, 2019 Credit Agreement | Line of Credit | Term Loan | London Interbank Offered Rate (LIBOR) | Minimum          
Debt Instrument [Line Items]          
Basis spread on variable rate 0.625%        
May 2, 2019 Credit Agreement | Line of Credit | Term Loan | London Interbank Offered Rate (LIBOR) | Maximum          
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        
Revolving credit facility, increase limit $ 250,000,000        
Debt instrument, maturity date extension | extension 2        
May 2, 2019 Credit Agreement | Line of Credit | Revolving Credit Facility | Base Rate | Minimum          
Debt Instrument [Line Items]          
Basis spread on variable rate 0.00%        
May 2, 2019 Credit Agreement | Line of Credit | Revolving Credit Facility | Base Rate | Maximum          
Debt Instrument [Line Items]          
Basis spread on variable rate 0.10%        
May 2, 2019 Credit Agreement | Line of Credit | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum          
Debt Instrument [Line Items]          
Basis spread on variable rate 0.69%        
May 2, 2019 Credit Agreement | Line of Credit | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum          
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        
Subsequent Event | Line of Credit | Revolving Credit Facility          
Debt Instrument [Line Items]          
Repayments under revolving credit facility   $ 1,000,000,000