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RELATED PARTY TRANSACTIONS (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 25, 2023
Jun. 30, 2024
Jun. 25, 2023
Dec. 31, 2023
Related Party Transaction [Line Items]          
Food, beverage and packaging costs $ 61,712,000 $ 56,229,000 $ 118,673,000 $ 109,856,000  
Other operating expenses 19,958,000 18,832,000 39,815,000 37,536,000  
Total restaurant operating expenses 137,293,000 126,451,000 266,753,000 247,692,000  
Accounts payable 37,584,000   $ 37,584,000   $ 33,189,000
TRA obligation percent     85.00%    
TRA amounts paid 0 0 $ 4,400,000 800,000  
Current portion of Tax Receivable Agreement liability 7,230,000   7,230,000   4,428,000
Tax receivable agreement liability $ 320,849,000   $ 320,849,000   295,390,000
Portillo's Inc. | Berkshire Partners LLC          
Related Party Transaction [Line Items]          
Ownership % 19.30%   19.30%    
Related party          
Related Party Transaction [Line Items]          
Accounts and tenant improvement receivables $ 500,000   $ 500,000   300,000
Food, beverage and packaging costs 512,000 478,000 1,014,000 1,063,000  
Other operating expenses 138,000 112,000 240,000 226,000  
Total restaurant operating expenses 650,000 $ 590,000 1,254,000 $ 1,289,000  
Accounts payable $ 300,000   $ 300,000   $ 400,000