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INCOME TAXES - (Narrative) (Details) - USD ($) |  | 4 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 04, 2015 | Dec. 30, 2015 | Dec. 28, 2016 | Dec. 30, 2015 | Dec. 31, 2014
Income Tax Disclosure [Abstract] |  |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Domestic |  |  | $ 19,019,000 |  |
Deferred Tax Assets, Operating Loss Carryforwards, State and Local |  |  | $ 197,201,000 |  |
Effective income tax rate (percent) |  |  | 22.30% | 51.40% | 23.80%
Net operating loss carryforwards |  | $ 334,000 | $ 7,338,000 | $ 334,000 |
Number of LLC interests (shares) |  |  | 5,362,125 |  |
Additional Deferred Tax Asset Recognized, Investment in Partnership |  |  | $ 67,580,000 |  |
Reduction in basis due to amortization of deferred tax asset related to the investment in partnership [Line Items] |  |  | 12,269,000 |  |
Valuation allowance |  | (23,155,000) | (15,568,000) | (23,155,000) | $ 0
Additional Deferred Tax Asset Recognized, Tax Receivable Agreement |  |  | 40,094,000 |  |
Deferred tax asset, tax receivable agreement |  | 69,513,000 | 110,022,000 | 69,513,000 |
Increase (decrease) in valuation allowance |  |  | (7,587,000) |  |
Deferred income taxes |  | 201,957,000 | 313,207,000 | 201,957,000 |
Tax receivable agreement liability |  |  | 272,482,000 |  |
Uncertain tax positions |  | $ 0 | $ 0 | $ 0 |
Percentage of tax benefits due to equity owners |  |  | 85.00% |  |
Tax receivable agreement amount paid |  |  | $ 0.15 |  |
LLC interests acquired | 5,968,841 | 2,848,035 | 5,207,149 | 6,003,308 |
Establishment of liabilities under tax receivable agreement |  |  | $ 100,063,000 | $ 173,090,000 | 0
Current portion of liabilities under tax receivable agreement |  | $ 2,157,000 | 4,580,000 | 2,157,000 |
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount |  |  | $ (1,353,000) | $ 0 | $ 0

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