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Summary of Significant Accounting Policies (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2013
USD ($)
$ / shares
Dec. 29, 2015
USD ($)
restaurant
$ / shares
Sep. 29, 2015
USD ($)
$ / shares
Jun. 30, 2015
USD ($)
$ / shares
Mar. 31, 2015
USD ($)
$ / shares
Dec. 30, 2014
USD ($)
restaurant
$ / shares
Sep. 30, 2014
USD ($)
$ / shares
Jul. 01, 2014
USD ($)
$ / shares
Apr. 01, 2014
USD ($)
$ / shares
Dec. 29, 2015
USD ($)
restaurant
$ / shares
Dec. 30, 2014
USD ($)
restaurant
$ / shares
Dec. 31, 2013
USD ($)
$ / shares
Fiscal Year                        
Length of fiscal year                   364 days 364 days 371 days
Restaurant sales | $ $ 32,000                 $ 1,791,446 $ 1,568,556 $ 1,410,118
Total revenue | $ $ 32,000 $ 454,351 $ 438,089 $ 454,698 $ 460,230 $ 404,425 $ 385,218 $ 395,363 $ 397,142 $ 1,807,368 $ 1,582,148 $ 1,422,585
Diluted EPS (in dollars per share) | $ / shares   $ 0.32 $ 0.29 $ 0.30 $ 0.46 $ 0.26 $ 0.27 $ 0.33 $ 0.37 $ 1.37 $ 1.23 $ 1.13
Cash and Cash Equivalents                        
Cash and cash equivalents included receivables from credit card entity | $   $ 7,700       $ 7,000       $ 7,700 $ 7,000  
Settlement period of credit card receivables, minimum                   2 days    
Settlement period of credit card receivables, maximum                   3 days    
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 EPS (in dollars per share) | $ / shares $ 0.03                      
Maximum                        
Fiscal Year                        
Length of fiscal year                   371 days    
Length of fiscal quarter                   98 days    
Diluted EPS (in dollars per share) | $ / shares $ 0.04                      
Unconsolidated restaurants                        
Principles of Consolidation                        
Number of restaurants | restaurant   24       23       24 23  
Unconsolidated restaurants | Minimum                        
Principles of Consolidation                        
Ownership percentage by entity   5.00%       5.00%       5.00% 5.00%  
Unconsolidated restaurants | Maximum                        
Principles of Consolidation                        
Ownership percentage by entity   10.00%       10.00%       10.00% 10.00%  
Unconsolidated restaurants | China restaurant operator                        
Principles of Consolidation                        
Ownership percentage by entity   40.00%       40.00%       40.00% 40.00%  
Number of restaurants | restaurant   4       4       4 4