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Current Liabilities - Narrative (Details)
1 Months Ended 9 Months Ended
May 02, 2019
USD ($)
extension
May 21, 2020
USD ($)
Apr. 30, 2020
USD ($)
Apr. 30, 2019
USD ($)
Jul. 31, 2019
USD ($)
Debt Instrument [Line Items]          
Short-term debt     $ 350,000,000   $ 50,000,000
Proceeds from borrowings under secured revolving credit facility     0 $ 48,000,000  
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     8,000,000 11,000,000  
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 400,000,000        
Term loan, increase limit 400,000,000        
Quarterly principal payment $ 12,500,000        
Short-term debt     350,000,000    
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        
Interest paid     0 $ 0  
Revolving credit facility, increase limit $ 250,000,000        
Unsecured revolving credit facility extension | extension 2        
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 | 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%        
Subsequent Event | Amendment to Master Credit Agreement | Line of Credit | Revolving Credit Facility          
Debt Instrument [Line Items]          
Proceeds from borrowings under secured revolving credit facility   $ 1,000,000,000