Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Receivables and Assets (Details)

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Summary of Significant Accounting Policies - Receivables and Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 28, 2017
Dec. 29, 2016
Receivables    
Allowance for doubtful accounts $ 349 $ 188
Inventory Valuation and Shrinkage    
Inventory valuation reserves $ 2,936 $ 2,449
Vendor Relationships    
Goodwill and Other Indefinite-Lived Intangible Assets    
Useful Life, intangible assets 10 years 10 years
Minimum    
Receivables    
Receivables collection period 3 days  
Minimum | Furniture, fixtures and equipment    
Fixed Assets    
Useful life, fixed assets 2 years  
Minimum | Leasehold improvements    
Fixed Assets    
Useful life, fixed assets 10 years  
Minimum | Computer software and hardware    
Fixed Assets    
Useful life, fixed assets 3 years  
Maximum    
Receivables    
Receivables collection period 5 days  
Maximum | Furniture, fixtures and equipment    
Fixed Assets    
Useful life, fixed assets 7 years  
Maximum | Leasehold improvements    
Fixed Assets    
Useful life, fixed assets 25 years  
Maximum | Computer software and hardware    
Fixed Assets    
Useful life, fixed assets 7 years