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DESCRIPTION OF BUSINESS (Details)		3 Months Ended
	Apr. 05, 2023 $ / shares shares	Mar. 31, 2024 $ / shares shares	Mar. 26, 2023 offering $ / shares shares	Jun. 30, 2024 food_production_commissary restaurant state	Dec. 31, 2023 restaurant
Schedule of Equity Method Investments [Line Items]
Number of states | state				10
Number of food production commissaries | food_production_commissary				2
Number of restaurants | restaurant				85	83
Number of non-traditional locations | restaurant				2	2
Portillo's Inc. | Portillo's Opco
Schedule of Equity Method Investments [Line Items]
Ownership %				84.10%	76.10%
Portillo's Inc. | Blocker Companies
Schedule of Equity Method Investments [Line Items]
Shares acquired (in shares)		2,167,629
Portillo's Inc. | Secondary Offering
Schedule of Equity Method Investments [Line Items]
Number of shares issued in transaction (in shares)		8,000,000	8,000,000
Sale of stock, price per share (in usd per share) | $ / shares	$ 21.05	$ 14.37	$ 21.05
Number of offerings | offering			1
Portillo's Inc. | Over-Allotment Option
Schedule of Equity Method Investments [Line Items]
Number of shares issued in transaction (in shares)	620,493	1,200,000
Sale of stock, transaction period		30 days
LLC Units
Schedule of Equity Method Investments [Line Items]
Redemption of LLC Interests (in shares)		5,832,371
Issuance (in shares)		5,832,371
pre-IPO LLC Members
Schedule of Equity Method Investments [Line Items]
Redemption of LLC Interests (in shares)		5,832,371
pre-IPO LLC Members | Portillo's Opco
Schedule of Equity Method Investments [Line Items]
Ownership %				15.90%	23.90%
C&O
Schedule of Equity Method Investments [Line Items]
Ownership percentage				50.00%

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