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Property and Equipment, Net (Schedule of Property and Equipment) (Details) - USD ($)
$ in Thousands
Dec. 27, 2019
Dec. 28, 2018
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 42,377 $ 39,341
Less accumulated depreciation (22,461) (19,591)
Property, Plant and Equipment, Net, Total 19,916 19,750
Equipment [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 9,211 9,048
Software [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 31,631 28,791
Leasehold Improvements [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 980 962
Furniture And Fixtures [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 555 $ 540