Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Revenues, Advertising and Pre-Opening (Details)

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Summary of Significant Accounting Policies - Revenues, Advertising and Pre-Opening (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
May 02, 2017
Dec. 26, 2019
Dec. 27, 2018
Dec. 28, 2017
Revenue from Contract with Customer [Abstract]        
Number of days customer may return merchandise   90 days    
Gift card breakage income   $ 1,197 $ 1,584 $ 757
Loyalty program award, as a percentage of selling price   1.00%    
Loyalty program breakage income   $ 1,051,000 401,000  
Allowance for sales returns   15,437 8,335  
Marketing and Advertising Expense [Abstract]        
Advertising expense   65,690 55,283 43,560
Pre-opening expenses   24,594 26,145 16,485
Gain (Loss) on Extinguishment of Debt [Abstract]        
Number of shares issued 10,147,025      
Common stock, par value $ 0.001      
Net proceeds from initial public offering $ 192,000     192,336
Payments on term loans $ 192,000 $ 3,500 $ 3,500 197,500
Loss on extinguishment of debt       $ 5,442
Maximum        
Marketing and Advertising Expense [Abstract]        
Period prior to store opening or relocation that pre-opening expenses begin   6 months    
Minimum        
Marketing and Advertising Expense [Abstract]        
Period prior to store opening or relocation that pre-opening expenses begin   3 months