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INCOME TAXES - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 30, 2020
Dec. 25, 2019
Dec. 26, 2018
Income Tax Contingency [Line Items]      
Effective income tax rate (percent) (0.10%) 12.30% 28.80%
Deferred tax assets, carryforwards, federal $ 313,940,000    
Deferred tax assets, carryforwards, state and local 183,829,000    
Net operating loss carryforwards 75,522,000 $ 26,058,000  
Additional deferred tax asset recognized, investment in partnership 8,609,000    
Additional deferred tax asset recognized, tax receivable agreement 1,106,000    
Other Income related to additional tax basis on TRA 1,147,000    
Valuation allowance recognized 2,579,000    
Decrease in valuation allowance 1,625,000    
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%    
Consolidated Entity, Ownership By Parent, LLC Units Acquired 194,009    
LLC interests acquired (in shares)   4,412,150  
Establishment of liabilities under tax receivable agreement $ 4,024,000 $ 32,065,000 $ 44,338,000
Other income recognized related to reduction of tax receivable agreement liability 6,643,000 707,000 0
Establishment of liabilities under tax receivable agreement 232,954,000 234,426,000  
Current portion of liabilities under tax receivable agreement 0 7,777,000  
Accelerated tax depreciation deductions related to assets placed in service 351    
Members' Equity      
Income Tax Contingency [Line Items]      
Other income recognized related to reduction of tax receivable agreement liability 6,643,000    
Limited Liability Company      
Income Tax Contingency [Line Items]      
Additional deferred tax asset recognized, investment in partnership 139,379,000    
Decrease in valuation allowance $ (77)    
LLC interests acquired (in shares) 650,951    
Parent Company      
Income Tax Contingency [Line Items]      
Percentage of tax benefits due to equity owners 85.00%    
Other income recognized related to reduction of tax receivable agreement liability $ 6,643,000 707,000 0
Establishment of liabilities under tax receivable agreement 232,954,000 234,426,000  
Current portion of liabilities under tax receivable agreement 0 7,777,000  
Consolidation, Eliminations | Parent Company      
Income Tax Contingency [Line Items]      
Establishment of liabilities under tax receivable agreement 4,024,000 $ 32,065,000 $ 44,338,000
Domestic Tax Authority      
Income Tax Contingency [Line Items]      
Net operating loss carryforwards 262,073,000    
Tax credit carryforwards 9,002,000    
State and Local Jurisdiction      
Income Tax Contingency [Line Items]      
Net operating loss carryforwards 40,695,000    
Tax credit carryforwards $ 608,000