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Current Liabilities - Narrative (Details)
1 Months Ended 6 Months Ended
Feb. 01, 2016
USD ($)
extension
Feb. 22, 2019
USD ($)
Jan. 31, 2019
USD ($)
Jan. 31, 2018
USD ($)
Jul. 31, 2018
USD ($)
Debt Instrument [Line Items]          
Short-term debt     $ 50,000,000   $ 50,000,000
February 1, 2016 Credit Agreement          
Debt Instrument [Line Items]          
Debt instrument, term 5 years        
Master credit agreement $ 1,500,000,000        
February 1, 2016 Credit Agreement | Term Loan          
Debt Instrument [Line Items]          
Interest paid     7,000,000 $ 5,000,000  
February 1, 2016 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        
February 1, 2016 Credit Agreement | Line of Credit | Term Loan          
Debt Instrument [Line Items]          
Unsecured term loan $ 500,000,000   413,000,000    
Short-term debt     50,000,000    
February 1, 2016 Credit Agreement | Line of Credit | Term Loan | Base Rate | Minimum          
Debt Instrument [Line Items]          
Basis spread on variable rate 0.125%        
February 1, 2016 Credit Agreement | Line of Credit | Term Loan | Base Rate | Maximum          
Debt Instrument [Line Items]          
Basis spread on variable rate 0.875%        
February 1, 2016 Credit Agreement | Line of Credit | Term Loan | LIBOR | Minimum          
Debt Instrument [Line Items]          
Basis spread on variable rate 1.125%        
February 1, 2016 Credit Agreement | Line of Credit | Term Loan | LIBOR | Maximum          
Debt Instrument [Line Items]          
Basis spread on variable rate 1.875%        
February 1, 2016 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 $ 3,000,000  
February 1, 2016 Credit Agreement | Line of Credit | Revolving Credit Facility | Base Rate | Minimum          
Debt Instrument [Line Items]          
Basis spread on variable rate 0.00%        
February 1, 2016 Credit Agreement | Line of Credit | Revolving Credit Facility | Base Rate | Maximum          
Debt Instrument [Line Items]          
Basis spread on variable rate 0.50%        
February 1, 2016 Credit Agreement | Line of Credit | Revolving Credit Facility | LIBOR | Minimum          
Debt Instrument [Line Items]          
Basis spread on variable rate 0.90%        
February 1, 2016 Credit Agreement | Line of Credit | Revolving Credit Facility | LIBOR | Maximum          
Debt Instrument [Line Items]          
Basis spread on variable rate 1.50%        
Subsequent event | Subsidiary | February 2019 Secured Credit Facility | Line of Credit | Revolving Credit Facility          
Debt Instrument [Line Items]          
Debt instrument, term   2 years      
Minimum percent drawn on line of credit facility   20.00%      
Secured revolving credit facility   $ 300,000,000      
Accrued interest rate on remaining borrowing capacity   0.50%      
Subsequent event | Subsidiary | February 2019 Secured Credit Facility | Line of Credit | Revolving Credit Facility | LIBOR          
Debt Instrument [Line Items]          
Basis spread on variable rate   2.39%