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Basis Of Presentation (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Oct. 01, 2017
USD ($)
Rate
Oct. 02, 2016
USD ($)
Oct. 01, 2017
USD ($)
Rate
Oct. 02, 2016
USD ($)
Dec. 31, 2017
Jan. 01, 2017
USD ($)
Entity Information [Line Items]            
Cash Equivalents, at Carrying Value $ 20,000,000   $ 20,000,000      
Senior Secured Second Lien Notes, Interest Rate | Rate 8.00%   8.00%      
Number of Restaurants 798   798      
Number of States in which Entity Operates 17   17      
Weeks In Fiscal Period 13 13 39 39    
Long-term Debt, Fair Value $ 292,900,000   $ 292,900,000      
Asset Impairment Charges $ 500,000 $ 300,000 $ 1,000,000 $ 900,000    
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