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Property and Equipment, Net (Schedule of Property and Equipment) (Details) - USD ($)
$ in Thousands
Dec. 29, 2017
Dec. 30, 2016
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 41,256 $ 34,429
Less accumulated depreciation (22,405) (19,655)
Property, Plant and Equipment, Net, Total 18,851 14,774
Equipment [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 7,194 6,580
Software [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 33,135 26,983
Leasehold Improvements [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 410 373
Furniture And Fixtures [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 517 $ 493