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Senior Notes (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2018
Dec. 30, 2017
Apr. 01, 2017
Debt Instrument [Line Items]        
Senior Notes $ 150 $ 150 $ 150 $ 0
Senior Notes, Maturity Date Aug. 14, 2029      
Senior Notes, Interest Rate 3.70% 3.70%    
Shelf Note - Amount $ 150 $ 150    
Shelf Notes - Maximum Maturity Date Range - in years 12      
Shelf Notes - Maximum Issuance Date August 14, 2020      
Debt Instrument, Percentage of Principal Amount Redeemable 1      
Shelf Notes - Additional Interest Rate 0.005      
Debt Instrument, Covenant Compliance all      
Amount of incremental credit facility which will result in modification of debt covenants   100    
Number of Financial Covenants [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Covenant Description   2    
Fixed Charge Coverage Ratio Minimum Requirement [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Covenant Description   2.00    
Leverage Ratio Maximum Requirement [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Covenant Description   4.00