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Details of Certain Balance Sheet Accounts - Accounts Receivable, Net (Details) - USD ($)
$ in Thousands
Sep. 26, 2020
Dec. 28, 2019
Accounts receivable, net:    
Allowance for credit losses $ (540) $ (3,040)
Accounts receivable, net of allowance 49,678 44,475
Trade receivables    
Accounts receivable, net:    
Accounts receivable, gross 25,448 28,635
Credit card receivables    
Accounts receivable, net:    
Accounts receivable, gross 18,470 14,173
Other receivables    
Accounts receivable, net:    
Accounts receivable, gross $ 6,300 $ 4,707