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INCOME TAXES - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 26, 2018
Dec. 27, 2017
Dec. 28, 2016
Income Tax Contingency [Line Items]      
Income tax expense related to tax cuts and jobs act   $ 138,636,000  
Effective income tax rate (percent) 28.80% 94.50% 22.30%
Deferred tax assets, carryforwards, federal $ 68,658,000    
Deferred tax assets, carryforwards, state and local 60,546,000    
Net operating loss carryforwards 18,046,000 $ 12,332,000  
Additional deferred tax asset recognized, investment in partnership 38,843,000    
Reduction in basis due to amortization of deferred tax asset related to the investment in partnership [Line Items] 12,383,000    
Valuation allowance (6,925,000) (10,114,000)  
Additional deferred tax asset recognized, tax receivable agreement 12,495,000    
Increase in valuation allowance 3,189,000    
Uncertain tax positions $ 0 0  
Percentage of tax benefits due to equity owners 85.00%    
Remaining percentage of tax benefits due to equity owners 15.00%    
Other income recognized related to reduction of tax receivable agreement liability $ 0 $ 4,844,000 $ 0
LLC interests acquired (in shares) 2,692,660 1,003,585  
Establishment of liabilities under tax receivable agreement   $ 18,973,000 $ 100,063,000
Establishment of liabilities under tax receivable agreement $ 203,725,000    
Current portion of liabilities under tax receivable agreement 5,804,000 $ 937,000  
Members' Equity      
Income Tax Contingency [Line Items]      
Other income recognized related to reduction of tax receivable agreement liability 0    
Federal Tax Authority      
Income Tax Contingency [Line Items]      
Net operating loss carryforwards 16,791,000    
State Tax Authority      
Income Tax Contingency [Line Items]      
Net operating loss carryforwards 4,586,000    
Limited Liability Company      
Income Tax Contingency [Line Items]      
Additional deferred tax asset recognized, investment in partnership $ 168,451,000    
LLC interests acquired (in shares) 2,993,356