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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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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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Number of shares issued which are neither cancelled nor held in the treasury.

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