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NON-CONTROLLING INTERESTS - Schedule of LLC Interest Ownership by Portillo's Inc. and Pre-IPO LLC Members (Details) - shares | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Portillo's Inc. |  |
Noncontrolling Interest [Line Items] |  |
Total | 100.00% | 100.00%
LLC Units |  |
Noncontrolling Interest [Line Items] |  |
LLC Interests (in shares) | 73,380,429 | 72,975,301
Portillo's Inc. | Portillo's Inc. |  |
Noncontrolling Interest [Line Items] |  |
Ownership % | 84.10% | 76.10%
Portillo's Inc. | LLC Units |  |
Noncontrolling Interest [Line Items] |  |
LLC Interests (in shares) | 61,739,874 | 55,502,375
pre-IPO LLC Members | Portillo's Inc. |  |
Noncontrolling Interest [Line Items] |  |
Ownership % | 15.90% | 23.90%
pre-IPO LLC Members | LLC Units |  |
Noncontrolling Interest [Line Items] |  |
LLC Interests (in shares) | 11,640,555 | 17,472,926

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