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SUPPLEMENTAL BALANCE SHEET INFORMATION - (Details) - USD ($)
$ in Thousands
Dec. 28, 2016
Dec. 30, 2015
Supplemental Balance Sheet Disclosures [Abstract]    
Sales tax payable $ 1,324 $ 1,073
Current portion of liabilities under tax receivable agreement 4,580 2,157
Gift card liability 1,153 833
Other 3,116 551
Other current liabilities $ 10,173 $ 4,614