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Commitments and Contingencies (Details)
$ in Millions
12 Months Ended
Jul. 15, 2016
USD ($)
Dec. 27, 2016
USD ($)
item
Dec. 29, 2015
USD ($)
item
Other Commitments and Contingencies      
Estimated cost to complete capital project commitments (in dollars)   $ 157.5 $ 129.4
Number of suppliers providing most of the company's beef | item   3  
Lease Agreements      
Real estate lease agreements      
Contingently liable amount   $ 16.4 $ 17.2
Number of leases entity contingently liable | item   7 7
Fair Labor Standards Act Class of Employees Claim      
Other Commitments and Contingencies      
Estimated loss contingency, net of tax   $ 4.5  
Fair Labor Standards Act Class of Employees Claim | General and administrative expense      
Other Commitments and Contingencies      
Estimated loss contingency recorded during period   $ 7.3  
Fair Labor Standards Act Class of Employees Claim | Maximum      
Other Commitments and Contingencies      
Settlement amount $ 9.5    
Everett, Massachusetts | Lease Agreements      
Real estate lease agreements      
Ownership percentage   5.00%  
Fargo, North Dakota | Lease Agreements      
Real estate lease agreements      
Ownership percentage   5.00%