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Summary of Significant Accounting Policies - Revenues (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 27, 2018
Sep. 28, 2017
Revenue from Contract with Customer [Abstract]    
Number of days customer may return merchandise 90 days  
Gift card breakage income $ 1,340  
Calculated under Revenue Guidance in Effect before Topic 606 [Member]    
Revenue from Contract with Customer [Abstract]    
Gift card breakage income   $ 568