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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