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Basis Of Presentation (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Jul. 01, 2018
USD ($)
Rate
Jul. 02, 2017
USD ($)
Jul. 01, 2018
USD ($)
segment
Rate
Jul. 02, 2017
USD ($)
Dec. 30, 2018
Dec. 31, 2017
USD ($)
Entity Information [Line Items]            
Cash Equivalents, at Carrying Value $ 36,300,000   $ 36,300,000     $ 27,600,000
Senior Secured Second Lien Notes, Interest Rate | Rate 8.00%   8.00%      
Number of Restaurants 807   807      
Number of States in which Entity Operates 17   17      
Weeks In Fiscal Period 13 13 26      
Number of Reportable Segments | segment     1      
Long-term Debt, Fair Value $ 287,400,000   $ 287,400,000     $ 290,500,000
Asset impairment charges $ 2,300,000 $ 200,000 $ 2,400,000 $ 600,000    
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