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NON-CONTROLLING INTERESTS - Changes in Ownership in Portillo's OpCo on the Company’s Equity (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 26, 2023
Noncontrolling Interest [Abstract]    
Net income (loss) attributable to Portillo's Inc. $ 4,562 $ (514)
Transfers from (to) non-controlling interests:    
Activity under equity-based compensation plans 813 711
Non-controlling interest adjustment 46,475 43,736
Redemption of LLC Units (58) (59)
Establishment of liabilities under Tax Receivable Agreement and related changes to deferred tax assets associated with increases in tax basis (15,913) (12,493)
Total effect of changes in ownership interest on equity attributable to Portillo's Inc. $ 35,879 $ 31,381