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Acquisition Table of 2015 Acquisitions (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jul. 01, 2018
USD ($)
Apr. 01, 2018
USD ($)
Dec. 31, 2017
USD ($)
Oct. 01, 2017
USD ($)
Jul. 02, 2017
USD ($)
Apr. 02, 2017
USD ($)
Dec. 30, 2018
USD ($)
restaurant
Dec. 31, 2017
USD ($)
Jan. 01, 2017
USD ($)
Dec. 30, 2012
Business Acquisition [Line Items]                        
Restaurants Acquired 10     1     17   44   4 278
Purchase Price                 $ 38,102 $ 37,923 $ 48,088  
Proceeds from sale-leaseback transactions                 $ 8,424 4,257 $ 53,599  
Land and building         $ 19,387         19,387    
Acquisition-related costs $ 400 $ 800 $ 100 $ 100 $ 100 $ 500 $ 500 $ 700        
2016 Acquisitions [Member]                        
Business Acquisition [Line Items]                        
Restaurants Acquired                     56  
Purchase Price                     $ 48,088  
Properties purchased for sale-leaseback, number                     15  
Properties sold in sale-leaseback transactions                 14      
Proceeds from sale-leaseback transactions                 $ 19,100      
Revenue of acquired restaurants since acquisition                   $ 70,800 $ 28,600