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Basis Of Presentation (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Oct. 02, 2018
USD ($)
restaurant
Sep. 30, 2018
USD ($)
Rate
Oct. 01, 2017
USD ($)
Sep. 30, 2018
USD ($)
segment
Rate
Oct. 01, 2017
USD ($)
Dec. 30, 2018
Dec. 31, 2017
USD ($)
Entity Information [Line Items]              
Cash Equivalents, at Carrying Value   $ 17,700,000   $ 17,700,000     $ 27,600,000
Senior Secured Second Lien Notes, Interest Rate | Rate   8.00%   8.00%      
Number of Restaurants   838   838      
Number of States in which Entity Operates   17   17      
Weeks In Fiscal Period   13 13 39      
Number of Reportable Segments | segment       1      
Long-term Debt, Fair Value   $ 286,900,000   $ 286,900,000     $ 290,500,000
Asset impairment charges   $ 100,000 $ 500,000 $ 2,500,000 $ 1,000,000    
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  
Number of restaurants acquired | restaurant 10            
Consideration transferred $ 10,400,000            
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