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Commitments and Contingencies (Details)
$ in Millions
3 Months Ended 12 Months Ended
Jul. 15, 2016
USD ($)
Mar. 28, 2017
USD ($)
Dec. 26, 2017
USD ($)
item
Dec. 27, 2016
USD ($)
item
Commitments and Contingencies        
Estimated cost to complete capital project commitments (in dollars)     $ 150.0 $ 157.5
Contingently liable amount     $ 15.6 $ 16.4
Number of leases guarantees entity contingently liable | item     7 7
Number of suppliers providing most of the company's beef | item     3  
U.S. Equal Employment Opportunity Commission        
Commitments and Contingencies        
Contingently liable amount     $ 12.0  
Estimated loss contingency, net of tax     9.2  
Legal settlement amount   $ 12.6    
Pre-tax charge associated with the legal fees   $ 2.3    
U.S. Equal Employment Opportunity Commission | General and administrative expense        
Commitments and Contingencies        
Total pre-tax charge     $ 14.9  
Case No. 50-2016-CA-007714_MB-AO | Fair Labor Standards Act Class of Employees Claim        
Commitments and Contingencies        
Estimated loss contingency, net of tax       $ 4.5
Case No. 50-2016-CA-007714_MB-AO | Fair Labor Standards Act Class of Employees Claim | General and administrative expense        
Commitments and Contingencies        
Total pre-tax charge       $ 7.3
Case No. 50-2016-CA-007714_MB-AO | Fair Labor Standards Act Class of Employees Claim | Maximum        
Commitments and Contingencies        
Legal settlement amount $ 9.5      
Everett, Massachusetts        
Commitments and Contingencies        
Ownership percentage     5.00%  
Fargo, North Dakota        
Commitments and Contingencies        
Ownership percentage     5.00%