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Goodwill and Intangible Assets (Details)
$ in Thousands
12 Months Ended
Dec. 27, 2017
USD ($)
restaurants
Dec. 28, 2016
USD ($)
Dec. 30, 2015
USD ($)
Goodwill [Roll Forward]      
Balance, beginning of year $ 35,233 $ 33,454  
Additions related to acquisitions 3,021 1,827  
Adjustments related to the sale of restaurants 15 (48)  
Balance, end of year 38,269 35,233 $ 33,454
Intangible Assets [Line Items]      
Gross carrying amount - Trade names 44,080 44,076  
Gross carrying amount - Liquor licenses 166 166  
Accumulated amortization - Intangible assets with definite lives 2,389 1,437  
Intangible assets 59,498 55,930  
Amortization expense of definite-lived intangible assets and other assets $ 2,500 1,500 $ 1,500
Restaurants reacquired from franchisees | restaurants 10    
Restaurants reacquired from former franchisees | restaurants 1    
Purchase price to reacquire franchised restaurants $ 8,800    
Purchase price allocated to property 1,300    
Purchase price allocated to goodwill 3,021 1,827  
Capital leases recorded related to acquired franchise restaurants 2,300    
Franchise and License Agreements [Member]      
Intangible Assets [Line Items]      
Gross carrying amount - Intangible assets with definite lives 0 190  
Accumulated amortization - Intangible assets with definite lives 0 186  
Reacquired Franchise Rights [Member]      
Intangible Assets [Line Items]      
Gross carrying amount - Intangible assets with definite lives 15,252 11,498  
Accumulated amortization - Intangible assets with definite lives 2,389 $ 1,251  
Purchase price allocation to reacquired franchise rights $ 4,500    
Weighted-average life of reacquired franchise rights 9 years