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Summary of Significant Accounting Policies (Details)
$ in Millions
12 Months Ended
Dec. 26, 2017
USD ($)
restaurant
Dec. 27, 2016
USD ($)
restaurant
Dec. 29, 2015
Fiscal Year      
Length of fiscal year 364 days 364 days 364 days
Cash and Cash Equivalents      
Cash and cash equivalents included receivables from credit card entity | $ $ 7.2 $ 8.8  
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    
Maximum      
Fiscal Year      
Length of fiscal year 371 days    
Length of fiscal quarter 98 days    
Unconsolidated restaurants      
Principles of Consolidation      
Number of restaurants 24 24  
Unconsolidated restaurants | Minimum      
Principles of Consolidation      
Ownership percentage by entity 5.00% 5.00%  
Unconsolidated restaurants | Maximum      
Principles of Consolidation      
Ownership percentage by entity 10.00% 10.00%  
Unconsolidated restaurants | China restaurant operator      
Principles of Consolidation      
Ownership percentage by entity 40.00% 40.00%  
Number of restaurants 4 4