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NON-CONTROLLING INTERESTS - Narrative (Details) - shares	3 Months Ended			6 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 25, 2023	Jun. 30, 2024	Jun. 25, 2023
Portillo's Opco
Noncontrolling Interest [Line Items]
Weighted average ownership percentage	15.90%		24.20%	18.70%	27.80%
LLC Units
Noncontrolling Interest [Line Items]
Redemption of LLC Interests (in shares)		5,832,371

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Noncontrolling Interest, Weighted Average Ownership Percentage by Noncontrolling Owners

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- Definition

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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