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Current Liabilities - Additional Information (Details)
3 Months Ended 12 Months Ended
Feb. 01, 2021
USD ($)
May 02, 2019
USD ($)
extension
Oct. 31, 2020
USD ($)
Jul. 31, 2021
USD ($)
Jul. 31, 2020
USD ($)
Jul. 31, 2019
USD ($)
Debt Instrument [Line Items]            
Repayments under revolving credit facility       $ 1,000,000,000 $ 0 $ 0
Interest paid       30,000,000 14,000,000 17,000,000
Line of Credit | Revolving Credit Facility            
Debt Instrument [Line Items]            
Interest paid       1,000,000 2,000,000 0
Amendment To Master Credit Agreement | Term Loan            
Debt Instrument [Line Items]            
Interest paid       2,000,000 $ 9,000,000 $ 15,000,000
Amendment To Master 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        
Amendment To Master 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        
Repayments under revolving credit facility     $ 1,000,000,000      
Fair value of amount outstanding       $ 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 | London Interbank Offered Rate (LIBOR) | Minimum            
Debt Instrument [Line Items]            
Basis spread on variable rate   0.69%        
Amendment To Master 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%        
Amendment To Master Credit Agreement | Line of Credit | Term Loan            
Debt Instrument [Line Items]            
Repayments of short-term debt $ 325,000,000          
Term loan, increase limit   $ 400,000,000        
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 | London Interbank Offered Rate (LIBOR) | Minimum            
Debt Instrument [Line Items]            
Basis spread on variable rate 0.625%          
Amendment To Master Credit Agreement | Line of Credit | Term Loan | London Interbank Offered Rate (LIBOR) | Maximum            
Debt Instrument [Line Items]            
Basis spread on variable rate 1.125%          
Amendment To Master Credit Agreement | Unsecured Debt | Term Loan            
Debt Instrument [Line Items]            
Aggregate principal amount   $ 400,000,000