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RELATED PARTY TRANSACTIONS (Details) - USD ($)
3 Months Ended 9 Months Ended
Oct. 25, 2021
Sep. 25, 2022
Sep. 26, 2021
Sep. 25, 2022
Sep. 26, 2021
Dec. 26, 2021
Related Party Transaction [Line Items]            
TRA obligation percent 85.00%          
TRA amounts paid   $ 0   $ 0    
Tax receivable agreement liability   $ 205,287,000   $ 205,287,000   $ 156,638,000
Portillo's Opco | Secondary Offering            
Related Party Transaction [Line Items]            
Ownership %   58.70%   58.70%    
Portillo's Inc. | Berkshire Partners LLC            
Related Party Transaction [Line Items]            
Ownership %   52.50%   52.50%    
Equity Method Investee | C&O            
Related Party Transaction [Line Items]            
Receivables   $ 400,000   $ 400,000   400,000
Olo            
Related Party Transaction [Line Items]            
Net Olo-related costs   677,000 $ 298,000 1,775,000 $ 784,000  
Payables   100,000   100,000   $ 0
Olo | Cost of goods sold, excluding depreciation and amortization            
Related Party Transaction [Line Items]            
Net Olo-related costs   566,000 176,000 1,449,000 409,000  
Olo | Other operating expenses            
Related Party Transaction [Line Items]            
Net Olo-related costs   $ 111,000 $ 122,000 $ 326,000 $ 375,000