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INCOME TAXES - Narrative (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 23, 2020
Sep. 25, 2019
Sep. 23, 2020
Sep. 25, 2019
Dec. 25, 2019
Income Tax Contingency [Line Items]          
Effective income tax rate reconciliation (in percentage) 11.50% (38.00%) 21.20% (0.20%)  
Ownership percentage, weighted average 92.50% 85.60% 92.10% 82.10%  
Deferred tax asset recognized as a result of investment in partnership     $ 1,562,000    
Deferred tax asset related to additional tax basis     116,000    
Uncertain tax positions $ 0   $ 0    
Percentage of tax benefits due to equity owners 85.00%   85.00%    
Percentage of tax benefits expected to be realized 15.00%   15.00%    
Consolidated Entity, Ownership By Parent, LLC Units Acquired     33,195    
Establishment of liabilities under tax receivable agreement   $ 20,027,000 $ 414,000 $ 20,027,000  
Tax receivable agreement payments to related parties $ 0 $ 0 6,643,000 $ 707,000  
Liabilities under tax receivable agreement 228,197,000   228,197,000   $ 234,426,000
Current portion of liabilities under tax receivable agreement 0   0   $ 7,777,000
Foreign Tax Credit          
Income Tax Contingency [Line Items]          
Deferred tax assets, valuation allowance 1,221,000   $ 1,221,000    
Limited Liability Company          
Income Tax Contingency [Line Items]          
Units acquired during the period (in shares)     213,263    
Deferred tax asset, investment in partnership $ 175,320,000   $ 175,320,000