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Commitments and Contingencies (Details)
$ in Millions
12 Months Ended
Dec. 25, 2018
USD ($)
item
Dec. 26, 2017
USD ($)
item
Dec. 27, 2016
USD ($)
Mar. 31, 2017
USD ($)
Jul. 15, 2016
USD ($)
Commitments and Contingencies          
Estimated cost to complete capital project commitments (in dollars) $ 168.3 $ 150.0      
Number of suppliers providing most of the company's beef | item 3        
Lease Agreements          
Commitments and Contingencies          
Contingently liable amount $ 14.8 $ 15.6      
Number of leases guarantees entity contingently liable | item 7 7      
Fair Labor Standards Act Class of Employees Claim          
Commitments and Contingencies          
Estimated loss contingency, net of tax     $ 4.5    
Fair Labor Standards Act Class of Employees Claim | General and administrative expense          
Commitments and Contingencies          
Total pre-tax charge     $ 7.3    
Fair Labor Standards Act Class of Employees Claim | Maximum          
Commitments and Contingencies          
Contingently liable amount         $ 9.5
U.S. Equal Employment Opportunity Commission          
Commitments and Contingencies          
Contingently liable amount       $ 12.0  
Estimated loss contingency, net of tax   $ 9.2      
U.S. Equal Employment Opportunity Commission | General and administrative expense          
Commitments and Contingencies          
Total pre-tax charge   $ 14.9      
Legal settlement expense, after tax $ 1.5        
Everett, Massachusetts | Officers, directors and shareholders          
Commitments and Contingencies          
Ownership percentage 5.00%        
Fargo, North Dakota | Officers, directors and shareholders          
Commitments and Contingencies          
Ownership percentage 5.00%