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NON-CONTROLLING INTERESTS - Narrative (Details)	3 Months Ended		6 Months Ended
	Jun. 29, 2025 shares	Jun. 30, 2024	Jun. 29, 2025	Jun. 30, 2024
Noncontrolling Interest [Line Items]
Redemption of LLC Interests (in shares)	7,290,465
Common Class B
Noncontrolling Interest [Line Items]
Redemption of LLC Interests (in shares)	7,290,465
Portillo's Inc.
Noncontrolling Interest [Line Items]
Redemption ratio	1		1
Portillo's Opco
Noncontrolling Interest [Line Items]
Weighted average ownership percentage	9.90%	15.90%	12.20%	18.70%

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Number of stock bought back by the entity at the exercise price or redemption price.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-SubTopic 10
-Topic 505
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-2

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