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NATURE OF OPERATIONS - Secondary Offering (Details) - $ / shares |  | 1 Months Ended | 4 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 04, 2015 | Aug. 31, 2015 | Dec. 30, 2015 | Dec. 28, 2016 | Dec. 30, 2015
Class of Stock [Line Items] |  |  |  |  |
Units acquired during the period (shares) | 5,968,841 |  | 2,848,035 | 5,207,149 | 6,003,308
Ownership percent of noncontrolling interest | 33.30% |  | 54.60% | 69.10% | 54.60%
Noncontrolling owners ownership percentage | 66.70% |  | 45.40% | 30.90% | 45.40%
Class A Common Stock | Common stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Redemptions (shares) |  |  | 2,848,035 | 5,207,149 |
Class B Common Stock | Common stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Effect of redemption (shares) | 5,968,841 |  | 2,848,035 | 5,207,149 |
Secondary offering |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Units acquired during the period (shares) |  | 3,155,273 |  |  |
Secondary offering | Class A Common Stock | Common stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Total shares offered |  | 4,000,000 |  |  |
Shares issued, share price (in dollars per share) |  | $ 60 |  |  |
Conversion of units from former equity owners (shares) |  | 844,727 |  |  |
Redemptions (shares) |  | 3,155,273 |  |  |
Secondary offering | Class B Common Stock | Common stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Effect of redemption (shares) |  | 3,155,273 |  |  |
Limited Liability Company |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Number of units redeemed (shares) |  |  | 2,848,035 | 5,207,149 |
Limited Liability Company | Secondary offering |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Number of units redeemed (shares) |  | 3,155,273 |  |  |

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