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Basis Of Presentation (Details)
3 Months Ended 12 Months Ended
Apr. 01, 2018
USD ($)
segment
Rate
Apr. 02, 2017
USD ($)
Dec. 30, 2018
Dec. 31, 2017
USD ($)
Entity Information [Line Items]        
Cash Equivalents, at Carrying Value $ 31,400,000      
Senior Secured Second Lien Notes, Interest Rate | Rate 8.00%      
Number of Restaurants 807      
Number of States in which Entity Operates 17      
Weeks In Fiscal Period 13 13    
Number of Reportable Segments | segment 1      
Long-term Debt, Fair Value $ 286,700,000     $ 290,500,000
Asset impairment charges $ 100,000 $ 400,000    
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