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SUPPLEMENTAL BALANCE SHEET INFORMATION (Details) - USD ($)
$ in Thousands
Dec. 26, 2018
Dec. 27, 2017
Supplemental Balance Sheet Disclosures [Abstract]    
Sales tax payable $ 3,143 $ 1,813
Current portion of liabilities under tax receivable agreement 5,804 937
Gift card liability 1,796 1,472
Other 3,287 3,715
Other current liabilities $ 14,030 $ 7,937