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NATURE OF OPERATIONS - Secondary Offering (Details) - shares | 12 Months Ended
--- | ---
Dec. 26, 2018 | Dec. 27, 2017
Class of Stock [Line Items] |  |
Units acquired during the period (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 A Common Stock | Common stock |  |
Class of Stock [Line Items] |  |
Redemptions (in shares) | 2,692,660 | 1,003,585
Class B Common Stock | 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
Units acquired during the period (in shares) | 2,993,356 |

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