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Commitments and Contingencies (Details) (USD $)
In Millions, unless otherwise specified
 6 Months Ended 6 Months Ended 0 Months Ended
Jul. 01, 2014
item
Dec. 31, 2013
Jul. 01, 2014
Irving lease
item
Jul. 01, 2014
Louisville lease
item
Jul. 01, 2014
Everett, Massachusetts
item
Jul. 01, 2014
Longmont, Colorado
item
Jul. 01, 2014
Montgomeryville, Pennsylvania
item
Jul. 01, 2014
Fargo, North Dakota
item
Jul. 01, 2014
Logan, Utah
item
Dec. 31, 2013
Aspen Creek
restaurant
Commitments and Contingencies                    
Estimated cost to complete capital project commitments (in dollars) $ 71.5 $ 65.2                
Real estate lease agreements                    
Number of restaurants sold                   2
Number of lease renewal terms     3 3 3 3 3 3 3  
Lease renewal term     5 years 5 years 5 years 5 years 5 years 5 years 5 years  
Number of franchises with real estate lease agreements 5                  
Ownership percentage         5.00% 5.00%   5.00%    
Amount of liability recorded for guarantees $ 0                  
Number of suppliers providing most of the company's beef 4                  
Minimum age specified in age discrimination allegation against entity 40 years