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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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