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Summary of Significant Accounting Policies (Details) (USD $)
 0 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2013
restaurant
Dec. 31, 2013
restaurant
Sep. 24, 2013
Jun. 25, 2013
Mar. 26, 2013
Dec. 25, 2012
restaurant
Sep. 25, 2012
Jun. 26, 2012
Mar. 27, 2012
Dec. 31, 2013
restaurant
Dec. 25, 2012
restaurant
Dec. 27, 2011
Principles of Consolidation                        
Number of minority ownership restaurants 420 420       392       420 392  
Fiscal Year                        
Length of fiscal year                   371 days 364 days 364 days
Restaurant sales $ 32,000,000                 $ 1,410,118,000 $ 1,252,358,000 $ 1,099,475,000
Total revenue 32,000,000 376,020,000 334,770,000 352,119,000 359,676,000 309,531,000 308,656,000 320,275,000 324,869,000 1,422,585,000 1,263,331,000 1,109,226,000
Diluted earnings per common share (in dollars per share)   $ 0.24 $ 0.24 $ 0.28 $ 0.37 $ 0.19 $ 0.25 $ 0.28 $ 0.27 $ 1.13 $ 1.00 $ 0.88
Cash and Cash Equivalents                        
Cash and cash equivalents included receivables from credit card entity $ 7,700,000 $ 7,700,000       $ 19,700,000       $ 7,700,000 $ 19,700,000  
Settlement period of credit card receivables, minimum                   2 years    
Settlement period of credit card receivables, maximum                   3 years    
Receivables                        
Minimum number of days receivable are past due, warranting individual evaluation for collectability                   120 days    
Minimum
                        
Fiscal Year                        
Length of fiscal year                   364 days    
Length of fiscal quarter                   91 days    
Diluted earnings per common share (in dollars per share) $ 0.03 $ 0.03                    
Maximum
                        
Fiscal Year                        
Length of fiscal year                   371 days    
Length of fiscal quarter                   98 days    
Diluted earnings per common share (in dollars per share) $ 0.04 $ 0.04                    
Unconsolidated restaurants
                        
Principles of Consolidation                        
Number of minority ownership restaurants 23 23       23       23 23  
Unconsolidated restaurants | Minimum
                        
Principles of Consolidation                        
Ownership interest (as a percent)                   5.00% 5.00%  
Unconsolidated restaurants | Maximum
                        
Principles of Consolidation                        
Ownership interest (as a percent)                   10.00% 10.00%