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NON-CONTROLLING INTERESTS - Schedule of LLC Interest Ownership by Portillo's Inc. and Pre-IPO LLC Members (Details) - shares | Jun. 29, 2025 | Dec. 29, 2024
--- | --- | ---
Portillo's Inc. |  |
Noncontrolling Interest [Line Items] |  |
Total | 100.00% | 100.00%
LLC Units |  |
Noncontrolling Interest [Line Items] |  |
LLC Interests (in shares) | 75,332,503 | 74,407,379
Portillo's Inc. | Portillo's Inc. |  |
Noncontrolling Interest [Line Items] |  |
Ownership % | 95.40% | 85.60%
Portillo's Inc. | LLC Units |  |
Noncontrolling Interest [Line Items] |  |
LLC Interests (in shares) | 71,890,168 | 63,674,579
Common Class B | Portillo's Inc. |  |
Noncontrolling Interest [Line Items] |  |
Ownership % | 4.60% | 14.40%
Common Class B | LLC Units |  |
Noncontrolling Interest [Line Items] |  |
LLC Interests (in shares) | 3,442,335 | 10,732,800

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