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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