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NATURE OF OPERATIONS - Organizational Transactions (Details) |  | 12 Months Ended
--- | --- | ---
Feb. 04, 2015 | Dec. 26, 2018 shares | Dec. 27, 2017 shares
Class of Stock [Line Items] |  |  |
LLC interests acquired (in shares) |  | 2,692,660 | 1,003,585
Ownership percent of noncontrolling interest |  | 79.60% | 72.10%
Noncontrolling owners ownership percentage |  | 20.40% | 27.90%
Class B Common Stock | Common stock |  |  |
Class of Stock [Line Items] |  |  |
Effect of redemption (in shares) |  | 2,692,660 | 1,003,585
Class A Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Ratio of common stock to limited liability company interest | 1 |  |

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