DESCRIPTION OF BUSINESS	6 Months Ended
DESCRIPTION OF BUSINESS	Jun. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
DESCRIPTION OF BUSINESS	DESCRIPTION OF BUSINESS Portillo’s Inc. ( "Inc.") was formed and incorporated as a Delaware corporation on June 8, 2021. Inc. was formed for the purpose of completing an initial public offering ("IPO") and related reorganization transactions (collectively, the "Transactions”) in order to carry on the business of PHD Group Holdings LLC and its subsidiaries ("Portillo's OpCo"). Portillo's Inc. is the sole managing member of Portillo’s OpCo, and as sole managing member, Inc. operates and controls all of the business and affairs of Portillo's OpCo and reports a non-controlling interest representing the economic interest in Portillo's OpCo held by the other members of Portillo's OpCo (the "pre-IPO LLC Members"). Unless the context otherwise requires, references to "we," "us," "our," "Portillo's," and the "Company" refer to Portillo's Inc. and its subsidiaries, including Portillo's OpCo. The Company operates fast-casual restaurants in 10 states, along with two food production commissaries in Illinois. As of June 30, 2024 and December 31, 2023, the Company had 85 and 83 restaurants in operation, respectively. The Company also had two non-traditional locations in operation as of June 30, 2024 and December 31, 2023. These non-traditional locations include a food truck and a ghost kitchen (small kitchen with no store-front presence, used to fill online orders). Portillo's additionally has a 50% interest in a single restaurant owned by C&O Chicago, L.L.C. ("C&O"), which is excluded from the Company's restaurant count noted above. The Company’s principal corporate offices are located in Oak Brook, Illinois. Secondary Offerings In the first quarter of 2024, the Company completed a secondary offering of 8,000,000 shares of the Company's Class A common stock at an offering price of $14.37 per share ("Q1 2024 Secondary Offering"). The Company granted BofA Securities, Inc., the underwriter (the "Underwriter"), a 30-day option to purchase up to an additional 1,200,000 shares of Class A common stock. The underwriter did not exercise its overallotment option within the 30-day period. We used all of the net proceeds from the Q1 2024 Secondary Offering to purchase LLC Units and corresponding shares of Class B common stock from certain pre-IPO LLC Members and to repurchase shares of Class A common stock from the shareholders of the entities treated as corporations for U.S. tax purposes that held LLC Units prior to the Transactions ("Blocker Companies") at a price per LLC Unit or share of Class A common stock, as applicable, equal to the public offering price per share of Class A common stock, less the underwriting discounts and commissions. The proceeds from the Q1 2024 Secondary Offering were used to (i) purchase 2,167,629 existing shares of Class A common stock from the shareholders of the Blocker Companies and (ii) redeem 5,832,371 LLC Units held by the pre-IPO LLC Members. In connection with the redemption, 5,832,371 shares of Class B common stock were surrendered by the pre-IPO LLC Members and canceled and the Company received 5,832,371 newly-issued LLC Units, increasing the Company's total ownership interest in Portillo's OpCo. As a result, Portillo’s did not receive any proceeds from the offering, and the total number of shares of Class A common stock and Class B common stock did not change; however, the number of outstanding shares of Class A common stock increased by the same number of the canceled shares of Class B common stock. In the first quarter of 2023, the Company completed one secondary offering of 8,000,000 shares at an offering price of $21.05 per share. On April 5, 2023, the Underwriter exercised its overallotment option in part, to purchase an additional 620,493 shares of the Company's Class A common stock at an offering price of $21.05 per share. As of June 30, 2024, the Company owns 84.1% of Portillo's OpCo and the pre-IPO LLC Members own the remaining 15.9% of Portillo's OpCo.