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RELATED PARTY TRANSACTIONS (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2025 USD ($) shares	Jun. 30, 2024 USD ($)	Jun. 29, 2025 USD ($)	Jun. 30, 2024 USD ($)	Dec. 29, 2024 USD ($)
Related Party Transaction [Line Items]
Food, beverage and packaging costs	$ 63,750	$ 61,712	$ 124,852	$ 118,673
Other operating expenses	21,919	19,958	43,709	39,815
Total restaurant operating expenses	143,975	137,293	283,756	266,753
Accounts payable	43,683		$ 43,683		$ 45,516
TRA obligation percent			85.00%
TRA amounts paid			$ 7,700	4,400
Current portion of Tax Receivable Agreement liability	9,177		9,177		7,686
Tax receivable agreement liability	$ 343,717		343,717		316,893
Redemption of LLC Interests (in shares) | shares	7,290,465
Distributions paid to non-controlling interest holders	$ 0	0	$ 1,291	838
Portillo's Inc.
Related Party Transaction [Line Items]
Redemption ratio	1		1
Common Class B
Related Party Transaction [Line Items]
Redemption of LLC Interests (in shares) | shares	7,290,465
Portillo's Inc. | Berkshire Partners L L C
Related Party Transaction [Line Items]
Ownership %	5.20%		5.20%
Related party
Related Party Transaction [Line Items]
Accounts and tenant improvement receivables	$ 300		$ 300		300
Food, beverage and packaging costs	497	512	984	1,014
Other operating expenses	142	138	293	240
Total restaurant operating expenses	639	$ 650	1,277	$ 1,254
Accounts payable	$ 300		$ 300		$ 400

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