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Property and Equipment, Net (Schedule of Property and Equipment) (Details) - USD ($)
$ in Thousands
Dec. 28, 2018
Dec. 29, 2017
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 39,341 $ 41,256
Less accumulated depreciation (19,591) (22,405)
Property, Plant and Equipment, Net, Total 19,750 18,851
Equipment [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 9,048 7,194
Software [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 28,791 33,135
Leasehold Improvements [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 962 410
Furniture And Fixtures [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 540 $ 517