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Debt (Senior Credit Facility) (Details)
Sep. 25, 2013
USD ($)
Jul. 04, 2015
USD ($)
May. 21, 2015
USD ($)
Mar. 26, 2015
USD ($)
Feb. 28, 2014
USD ($)
2015 Senior Secured Credit Facility [Member]          
Line of Credit Facility [Line Items]          
Unamortized financing costs   $ 2,641,000      
Senior Secured Credit Facility [Member]          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity under credit facility $ 1,000,000,000     $ 1,800,000,000  
Term of line of credit (years) 5 years        
Payment of financing costs $ 1,836,000        
Unamortized financing costs $ 11,440,000        
Utilized borrowings under credit facility   1,149,120,000      
Available amount under credit facility   650,880,000      
Senior Secured Credit Facility [Member] | Minimum [Member]          
Line of Credit Facility [Line Items]          
Commitment fee percentage 0.10%        
Consolidated interest coverage ratio 3.0        
Senior Secured Credit Facility [Member] | Maximum [Member]          
Line of Credit Facility [Line Items]          
Commitment fee percentage 0.225%        
Consolidated net leverage ratio 3.75        
Senior Secured Credit Facility [Member] | Federal Funds [Member]          
Line of Credit Facility [Line Items]          
Basis spread on debt instrument 0.50%        
Senior Secured Credit Facility [Member] | Libor [Member] | Minimum [Member]          
Line of Credit Facility [Line Items]          
Basis spread on debt instrument 1.00%        
Senior Secured Credit Facility [Member] | Libor [Member] | Maximum [Member]          
Line of Credit Facility [Line Items]          
Basis spread on debt instrument 1.75%        
Senior Secured Credit Facility [Member] | Monthly Libor [Member]          
Line of Credit Facility [Line Items]          
Basis spread on debt instrument 1.00%        
Senior Secured Credit Facility [Member] | Monthly Libor [Member] | Minimum [Member]          
Line of Credit Facility [Line Items]          
Basis spread on debt instrument 0.00%        
Senior Secured Credit Facility [Member] | Monthly Libor [Member] | Maximum [Member]          
Line of Credit Facility [Line Items]          
Basis spread on debt instrument 0.75%        
Commercial Paper [Member]          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity under credit facility     $ 1,800,000,000   $ 1,000,000,000
Utilized borrowings under credit facility   541,000,000      
2013 Senior Secured Credit Facility [Member]          
Line of Credit Facility [Line Items]          
Unamortized financing costs   8,654,000      
Borrowings [Member] | Senior Secured Credit Facility [Member]          
Line of Credit Facility [Line Items]          
Utilized borrowings under credit facility   606,739,000      
Standby Letters Of Credit Related To Various Insurance Contracts And Foreign Vendor Commitments [Member] | Senior Secured Credit Facility [Member]          
Line of Credit Facility [Line Items]          
Standby letters of credit for various insurance contracts and commitments to foreign vendors   $ 1,381,000