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Commitments and Contingencies (Details)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 26, 2018
USD ($)
item
Mar. 28, 2017
USD ($)
Jun. 26, 2018
USD ($)
item
Dec. 26, 2017
USD ($)
item
Mar. 31, 2017
USD ($)
Commitments and Contingencies          
Estimated cost to complete capital project commitments (in dollars) $ 153.8   $ 153.8 $ 150.0  
Number of suppliers providing most of the company's beef | item 3   3    
Lease Agreements          
Commitments and Contingencies          
Number of leases guarantees entity contingently liable | item     7 7  
Lease Agreements | Maximum          
Commitments and Contingencies          
Contingently liable amount $ 15.2   $ 15.2 $ 15.6  
U.S. Equal Employment Opportunity Commission          
Commitments and Contingencies          
Contingently liable amount         $ 12.0
Estimated loss contingency, net of tax   $ 9.2      
Claims administration costs $ 0.6        
U.S. Equal Employment Opportunity Commission | General and administrative expense          
Commitments and Contingencies          
Total pre-tax charge   14.9      
Legal settlement amount   12.6      
Pre-tax charge associated with the legal fees   $ 2.3      
Everett, Massachusetts | Lease Agreements          
Commitments and Contingencies          
Ownership percentage 5.00%   5.00%    
Fargo, North Dakota | Lease Agreements          
Commitments and Contingencies          
Ownership percentage 5.00%   5.00%