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STOCKHOLDER'S EQUITY (Details) |  | 12 Months Ended
--- | --- | ---
Feb. 04, 2015 | Dec. 26, 2018 $ / shares shares | Dec. 27, 2017 $ / shares shares
Class of Stock [Line Items] |  |  |
Preferred stock, shares authorized (in shares) |  | 10,000,000 | 10,000,000
LLC interests acquired (in shares) |  | 2,692,660 | 1,003,585
Class A Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Common stock, shares, issued (in shares) |  | 29,520,833 | 26,527,477
Common stock, shares authorized (in shares) |  | 200,000,000 | 200,000,000
Common stock par value (in dollars per share) | $ / shares |  | $ 0.001 | $ 0.001
Ratio of common stock to limited liability company interest | 1 |  |
Class B Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Common stock, shares, issued (in shares) |  | 7,557,347 | 10,250,007
Common stock, shares authorized (in shares) |  | 35,000,000 | 35,000,000
Common stock par value (in dollars per share) | $ / shares |  | $ 0.001 | $ 0.001
Common stock | Class A Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Redemptions (in shares) |  | 2,692,660 | 1,003,585
Common stock | Class B Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Effect of redemption (in shares) |  | 2,692,660 | 1,003,585
Limited Liability Company |  |  |
Class of Stock [Line Items] |  |  |
Number of units redeemed (in shares) |  | 2,692,660 | 1,003,585
LLC interests acquired (in shares) |  | 2,993,356 |
Stock options |  |  |
Class of Stock [Line Items] |  |  |
LLC interests acquired (in shares) |  | 300,696 | 372,508

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