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Basis Of Presentation (Details)
3 Months Ended 12 Months Ended
Apr. 02, 2017
USD ($)
Apr. 03, 2016
USD ($)
Dec. 31, 2017
Jan. 01, 2017
USD ($)
Entity Information [Line Items]        
Number of Restaurants 788      
Number of States in which Entity Operates 16      
Weeks In Fiscal Period 13 13    
Long-term Debt, Fair Value $ 214,300,000      
Asset Impairment Charges $ 400,000 $ 200,000    
Cumulative Effect of New Accounting Principle in Period of Adoption       $ 3,734,000
Minimum [Member]        
Entity Information [Line Items]        
Weeks In Fiscal Period 52      
Maximum [Member]        
Entity Information [Line Items]        
Weeks In Fiscal Period 53      
Subsequent Event [Member]        
Entity Information [Line Items]        
Weeks In Fiscal Period     52  
Accounting Standards Update 2017-04 [Member]        
Entity Information [Line Items]        
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income $ 0      
Accounting Standards Update 2014-09 [Member]        
Entity Information [Line Items]        
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income $ 0