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Commitments and Contingencies (Purchase Obligations - Text) (Details)
$ in Millions
12 Months Ended
Dec. 27, 2015
USD ($)
supplier
Dec. 28, 2014
USD ($)
Concentration Risk [Line Items]    
Purchase obligations | $ $ 509.7 $ 563.2
Number of primary beef suppliers | supplier 4  
Percentage of marketplace 85.00%  
Beef [Member] | Supplier concentration risk [Member]    
Concentration Risk [Line Items]    
Concentration risk, percentage 90.00%