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Commitments and Contingencies (Details)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2013
restaurant
Jun. 30, 2015
USD ($)
item
Jun. 30, 2015
USD ($)
item
Dec. 30, 2014
USD ($)
item
Real estate lease agreements        
Number of franchises with real estate lease agreements     5  
Contingently liable amount | $   $ 17.6 $ 17.6 $ 18.0
Number of leases entity contingently liable     7 7
Other Commitments and Contingencies        
Estimated cost to complete capital project commitments (in dollars) | $   $ 178.7 $ 178.7 $ 153.2
Amount of liability recorded for guarantees | $     $ 0.0  
Number of suppliers providing most of the company's beef   4 4  
Minimum age specified in age discrimination allegation against entity     40 years  
Irving lease        
Real estate lease agreements        
Number of lease renewal terms     3  
Lease renewal term     5 years  
Louisville lease        
Real estate lease agreements        
Number of lease renewal terms     3  
Lease renewal term     5 years  
Everett, Massachusetts        
Real estate lease agreements        
Number of lease renewal terms     3  
Lease renewal term     5 years  
Ownership percentage   5.00% 5.00%  
Longmont, Colorado        
Real estate lease agreements        
Number of lease renewal terms     3  
Lease renewal term     5 years  
Ownership percentage   5.00% 5.00%  
Montgomeryville, Pennsylvania        
Real estate lease agreements        
Number of lease renewal terms     3  
Lease renewal term     5 years  
Fargo, North Dakota        
Real estate lease agreements        
Number of lease renewal terms     3  
Lease renewal term     5 years  
Ownership percentage   5.00% 5.00%  
Logan, Utah        
Real estate lease agreements        
Number of lease renewal terms     3  
Lease renewal term     5 years  
Aspen Creek concept        
Real estate lease agreements        
Number of restaurants sold | restaurant 2