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NATURE OF OPERATIONS (Details)	Feb. 04, 2015 $ / shares shares	Sep. 27, 2017 Restaurant	Dec. 28, 2016
Class of Stock [Line Items]
Ownership percent of noncontrolling interest		71.20%	69.10%
Number of restaurants		143
IPO | Common stock | Class A Common Stock
Class of Stock [Line Items]
Shares issued during the period (in shares) | shares	5,750,000
Shares issued, share price (in dollars per share) | $ / shares	$ 21.00
United States | Company-operated
Class of Stock [Line Items]
Number of restaurants		79
United States | Licensed
Class of Stock [Line Items]
Number of restaurants		10
Non-United States | Licensed
Class of Stock [Line Items]
Number of restaurants		54

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