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Net (loss) income attributable to Portillo's Inc. 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Income Tax Expense (Benefit) Schedule of Lease Terms and Discount Rates Lessee, Operating Lease, Terms [Table Text Block] Lessee, Operating Lease, Terms Accrued expenses and other liabilities Increase (Decrease) in Accrued Liabilities Schedule of LLC Interest Ownership by Portillo's Inc. and Pre-IPO LLC Members Schedule of Other Ownership Interests [Table Text Block] 2024 Lessee, Operating Lease, Liability, to be Paid, Year One Financial Instrument [Axis] Financial Instrument [Axis] Long-Term Debt, Maturity, Year Three Long-Term Debt, Maturity, Year Three Subsequent Event Subsequent Event [Member] Schedule of Gift Card Liability Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Document Period End Date Document Period End Date Deferred lease incentives Increase (Decrease) In Deferred Lease Incentives Increase (Decrease) In Deferred Lease Incentives Gift Card Gift Card [Member] Gift Card TOTAL ASSETS Assets Debt Disclosure [Abstract] Payment 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Sale of Stock, Over-Allotment Purchase Period Sale of Stock, Over-Allotment Purchase Period Entity Registrant Name Entity Registrant Name Issuance (in shares) Stock Issued During Period, Shares, New Issues Gift card sales that will not be redeemed, percent Deferred Revenue, Gift Card Sales That Will Not Be Redeemed, Percent Deferred Revenue, Gift Card Sales That Will Not Be Redeemed, Percent Redemption of LLC Units in connection with the secondary offering Stock Redeemed or Called During Period, Value SUBSEQUENT EVENTS Subsequent Events [Text Block] TRA amounts paid Tax Receivable Agreement, Amount Paid Tax Receivable Agreement, Amount Paid Entity Address, City or Town Entity Address, City or Town Leases [Abstract] Receivables from related parties Increase (Decrease) in Accounts Receivable, Related Parties Restaurant operating expenses: Operating Expenses [Abstract] Mutual funds Mutual Fund [Member] Total stockholders' equity Beginning balance Ending balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Consolidation Consolidation, Policy [Policy Text Block] 2023 Term Loan Term Loans Term Loan [Member] Term Loan Non-controlling interest Stockholders' Equity Attributable to Noncontrolling Interest Statement of Financial Position [Abstract] Entity Emerging Growth Company Entity Emerging Growth Company Occupancy Occupancy, Net Common stock, par value (in usd per share) Common Stock, Par or Stated Value Per Share Raw materials Inventory, Raw Materials, Net of Reserves Commitments and Contingencies Disclosure [Abstract] Investment, Name [Axis] Investment, Name [Axis] FAIR VALUE OF FINANCIAL INSTRUMENTS Fair Value Disclosures [Text Block] Trading Symbol Trading Symbol Entity File Number Entity File Number 2027 Finite-Lived Intangible Asset, Expected Amortization, Year Four Periodic principal payment Debt Instrument, Periodic Payment, Principal Labor Labor [Member] Labor Effective income tax rate percent Effective Income Tax Rate Reconciliation, Percent Use of Estimates Use of Estimates, Policy [Policy Text Block] Accounts payable Increase (Decrease) in Accounts Payable London Interbank Offered Rate (LIBOR) London Interbank Offered Rate (LIBOR) [Member] Subsequent Events [Abstract] INCOME TAXES Income Tax Disclosure [Text Block] Finished goods Inventory, Finished Goods, Net of Reserves Credit Facility [Domain] Credit Facility [Domain] Gross Carrying Amount Intangible Assets, Gross (Excluding Goodwill) Interest paid Interest Paid, Excluding Capitalized Interest, Operating Activities Basic (in usd per share) Basic net (loss) income per share (in usd per share) Earnings Per Share, Basic 2026 Lessee, Operating Lease, Liability, to be Paid, Year Three Schedule of Equity Method Investments [Table] Schedule of Equity Method Investments [Table] Letter of credit fee percentage Line Of Credit Facility, Letter Of Credit Fee Percentage Line Of Credit Facility, Letter Of Credit Fee Percentage Land improvements Land Improvements [Member] Counterparty Name [Domain] Counterparty Name [Domain] Total stockholders' equity attributable to Portillo's Inc. 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Available for Grant Class of Stock [Axis] Class of Stock [Axis] Statement [Table] Statement [Table] Schedule of Effects of Changes in Ownership in Portillo's OpCo on the Company’s Equity Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Table Text Block] Non-controlling interest adjustments, including the secondary offering Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Issuance of Equity by Subsidiary to Noncontrolling Interests Effective interest rate Debt Instrument, Interest Rate, Effective Percentage Document Quarterly Report Document Quarterly Report Letter of Credit Letter of Credit [Member] Furniture, fixtures, and equipment Furniture and Fixtures [Member] CURRENT ASSETS: Assets, Current [Abstract] Long-term operating lease liability Non-current lease liabilities Operating Lease, Liability, Noncurrent Treasury stock, acquired (in shares) Treasury Stock, Shares, Acquired Indefinite-lived intangible assets Indefinite-Lived Intangible Assets (Excluding Goodwill) 2014 Term B-3 Loans First Lien Term B-3 Loans [Member] First Lien Term B-3 Loans Leasehold improvements Leasehold Improvements [Member] Accumulated deficit Retained Earnings (Accumulated Deficit) Accounts receivable Accounts Receivable, after Allowance for Credit Loss, Current Number of new restaurants Number Of Restaurants Opened During Period Number Of Restaurants Opened During Period Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Activity under equity-based compensation plans Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Shares Issued For Equity Based Compensation Plans Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Shares Issued For Equity Based Compensation Plans Equity Components [Axis] Equity Components [Axis] Deferred tax assets from Tax Receivable Agreement Deferred Tax Assets, Tax Receivable Agreement Deferred Tax Assets, Tax Receivable Agreement Recurring Fair Value, Recurring [Member] RELATED PARTY TRANSACTIONS Related Party Transactions Disclosure [Text Block] Establishment of liabilities under Tax Receivable Agreement Increase (Decrease) In Liabilities Under Tax Receivable Agreement Increase (Decrease) In Liabilities Under Tax Receivable Agreement Segment Reporting Segment Reporting, Policy [Policy Text Block] Document Fiscal Year Focus Document Fiscal Year Focus Pre-opening expenses Pre-Opening Costs Cost of goods sold, excluding depreciation and amortization Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization CASH FLOWS FROM OPERATING ACTIVITIES: Net Cash Provided by (Used in) Operating Activities [Abstract] Statement [Line Items] Statement [Line Items] Variable Rate [Domain] Variable Rate [Domain] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Intangibles subject to amortization, gross 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Outstanding Goodwill Goodwill Schedule of Operating Lease Right-of-use Assets and Liabilities Assets And Liabilities, Lessee [Table Text Block] Assets And Liabilities, Lessee Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset [Axis] Equity Method Investee Equity Method Investee [Member] Secured Overnight Financing Rate (SOFR) Secured Overnight Financing Rate (SOFR) [Member] Secured Overnight Financing Rate (SOFR) Adjustments to reconcile net (loss) income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] GOODWILL & INTANGIBLE ASSETS Goodwill and Intangible Assets Disclosure [Text Block] Income tax (benefit) expense Income Tax Expense (Benefit) Preferred stock, par value (in usd per share) Preferred Stock, Par or Stated Value Per Share 2027 Lessee, Operating Lease, Liability, to be Paid, Year Four Proceeds from short-term debt, net Proceeds from Short-Term Debt Income Statement [Abstract] Additional Paid-in Capital Additional Paid-in Capital [Member] Document Fiscal Period Focus Document Fiscal Period Focus Additional tax receivable liability Tax Receivable Agreement Liability Increase (Decrease) Tax Receivable Agreement Liability Increase (Decrease) Diluted (in shares) Weighted-average number of common shares outstanding-diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Less accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Schedule of Inventories Schedule of Inventory, Current [Table Text Block] Favorable rental contracts Contract-Based Intangible Assets [Member] Debt issuance costs Debt Issuance Costs, Gross Common stock Common Stock, Value, Issued Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Other income, net Other Operating Income (Expense), Net Schedule of Units Excluded from Calculation of Diluted Earnings per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Short-term operating lease cost Short-Term Lease, Cost Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Cash and cash equivalents and restricted cash CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT BEGINNING OF THE PERIOD CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT END OF THE PERIOD Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Net (loss) income attributable to non-controlling interests Net (loss) income attributable to non-controlling interests Net Income (Loss) Attributable to Noncontrolling Interest CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] CURRENT LIABILITIES: Liabilities, Current [Abstract] Proceeds from stock option exercises Proceeds from Stock Options Exercised Proceeds from long-term debt Proceeds from Issuance of Long-Term Debt Common stock issued (in shares) Common Stock, Shares, Issued Equity method investment Equity Method Investments Current deferred revenue Contract with Customer, Liability, Current Accrued capital expenditures Capital Expenditures Incurred but Not yet Paid Income Statement Location [Domain] Income Statement Location [Domain] Amendment Flag Amendment Flag NET CASH USED IN INVESTING ACTIVITIES Net Cash Provided by (Used in) Investing Activities Operating lease cost Operating Lease, Cost Debt, principal amount Debt Instrument, Face Amount Construction-in-progress Construction in Progress [Member] Entity Current Reporting Status Entity Current Reporting Status Credit Agreement Credit Agreement [Member] Credit Agreement Goodwill and Intangible Assets Disclosure [Abstract] Total other assets Other Assets, Noncurrent Depreciation and amortization Depreciation, Depletion and Amortization 2029 and thereafter Finite-Lived Intangible Asset, Expected Amortization, after Year Five Counterparty Name [Axis] Counterparty Name [Axis] Schedule of Related Party Transactions Schedule of Related 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Portillo's OpCo [Member] Portillo's OpCo Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Gift card breakage Gift card breakage Gift Card Breakage Gift Card Breakage Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Property and equipment, net Total property and equipment Property, Plant and Equipment, Net Operating cash flows for operating leases Operating Lease, Payments Labor Labor and Related Expense Number of non-traditional locations Number Of Non-traditional Restaurants Number Of Non-traditional Restaurants Payments of long-term debt Repayments of Long-Term Debt Schedule of Aggregate Amortization Expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Total debt, net Long-Term Debt Sale of stock, price per share (in usd per share) Sale of Stock, Price Per Share Common stock authorized (in shares) Common Stock, Shares Authorized Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Operating lease assets Increase (Decrease) in Operating Lease Assets Increase (Decrease) in Operating Lease Assets Class A Common Stock Portillo's Inc. 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Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Change Due to Net Income Attributable to Parent and Effects of Changes, Net Long-Lived Tangible Asset [Domain] Long-Lived Tangible Asset [Domain] Accounts receivable Increase (Decrease) in Accounts Receivable Short-term debt Short-term debt Short-Term Debt Title of 12(b) Security Title of 12(b) Security DESCRIPTION OF BUSINESS Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Ownership % Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners LLC Units LLC Units [Member] LLC Units Total restaurant operating expenses Costs and Expenses Subsequent Event [Line Items] Subsequent Event [Line Items] Debt Instrument [Line Items] Debt Instrument [Line Items] Income Tax Contingency [Line Items] Income Tax Contingency [Line Items] Activity under equity-based compensation plans (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Right-of-use assets Total operating lease liabilities Operating Lease, Liability Noncontrolling Interest [Table] Noncontrolling Interest [Table] 2025 Finite-Lived Intangible Asset, Expected Amortization, Year Two LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities and Equity [Abstract] Tax Receivable Agreement liability Tax receivable agreement liability Tax Receivable Agreement Liability, Noncurrent Tax Receivable Agreement Liability, Noncurrent Inventory Total inventory Inventory, Net Accounts payable Accounts Payable, Current Number of restaurants Number of Restaurants Long-Term Debt, Maturity, Year Four Long-Term Debt, Maturity, Year Four Entity Filer Category Entity Filer Category Basic (in shares) Weighted-average number of common shares outstanding-basic (in shares) Weighted Average Number of Shares Outstanding, Basic Portillo's Inc. Portillo's Inc. [Member] Portillo's Inc. Ownership percentage Equity Method Investment, Ownership Percentage Total equity-based compensation expense Share-Based Payment Arrangement, Expense COMMITMENTS AND CONTINGENCIES (NOTE 14) Commitments and Contingencies Security Exchange Name Security Exchange Name Thereafter Lessee Operating Lease Liability To Be Paid Due After Year Four Lessee Operating Lease Liability To Be Paid Due After Year Four Fronting fee, percentage Line Of Credit Facility, Fronting Fee Percentage Line Of Credit Facility, Fronting Fee Percentage Loss on sales of assets Gain (Loss) on Disposition of Assets Preferred stock, $0.01 par value per share, 10,000,000 shares authorized, none issued or outstanding Preferred Stock, Value, Issued Letters of Credit Outstanding, Amount Letters of Credit Outstanding, Amount Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] General and administrative expenses General and Administrative Expense [Member] Short-Term Debt, Type [Domain] Short-Term Debt, Type [Domain] REVENUES, NET Revenue from Contract with Customer, Excluding Assessed Tax LONG-TERM LIABILITIES: Liabilities, Noncurrent [Abstract] Cover [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] EQUITY-BASED COMPENSATION Share-Based Payment Arrangement [Text Block] Work in progress Inventory, Work in Process, Net of Reserves REVENUE RECOGNITION Revenue from Contract with Customer [Text Block] Amortization of deferred lease incentives Amortization Of Deferred Lease Incentives Amortization Of Deferred Lease Incentives Revenue from External Customers by Products and Services [Table] Revenue from External Customers by Products and Services [Table] Non-Controlling Interest Noncontrolling Interest [Member] Employee withholding taxes related to net settled equity awards Payment, Tax Withholding, Share-Based Payment Arrangement TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities and Equity Proceeds from Employee Stock Purchase Plan purchases Proceeds, Issuance of Shares, Share-Based Payment Arrangement, Excluding Option Exercised Amortization of debt issuance costs Amortization of Debt Issuance Costs Related Party [Axis] Related Party [Axis] Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Shares: Earnings Per Share, Diluted [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Current Fiscal Year End Date Current Fiscal Year End Date Total Ownership Percentage Ownership Percentage Less: imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Net Carrying Amount Intangible Assets, Net (Excluding Goodwill) Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Diluted (in usd per share) Diluted net (loss) income per share (in usd per share) Earnings Per Share, Diluted Sale of Stock [Domain] Sale of Stock [Domain] Proceeds from the sale of property and equipment Proceeds from Sale of Property, Plant, and Equipment Payment of initial public offering issuance costs Payments of Stock Issuance Costs Ownership % Noncontrolling Interest, Ownership Percentage by Parent Equity-based compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Total current liabilities Liabilities, Current Consigned inventory Other Inventory, Net of Reserves 2025 Lessee, Operating Lease, Liability, to be Paid, Year Two Recipes Intellectual Property [Member] Redemption of LLC Units in connection with the secondary offering Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Repurchase of Shares by Subsidiary Number of food production commissaries Number Of Food Production Commissaries Number Of Food Production Commissaries Entity Ex Transition Period Entity Ex Transition Period Commitment fee percentage Line of Credit Facility, Commitment Fee Percentage Adoption of Accounting Standards Codification 842 - Leases Cumulative Effect, Period of Adoption, Adjustment [Member] C&O C&O Chicago, LLC [Member] C&O Chicago, LLC Amortization expense Amortization Schedule of Maturity Analysis of Lease Liabilities Lessee, Operating Lease, Liability, Maturity [Table Text Block] Entity Address, Address Line Two Entity Address, Address Line Two Entity Address, Address Line One Entity Address, Address Line One Payments of Tax Receivable Agreement liability Payments Of Tax Receivable Agreement Liability Payments Of Tax Receivable Agreement Liability Gift card liability Contract with Customer, Liability Product and Service [Axis] Product and Service [Axis] Over-Allotment Option Over-Allotment Option [Member] Class of Stock [Domain] Class of Stock [Domain] Fair Value Disclosures [Abstract] Remaining borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Credit Facility [Axis] Credit Facility [Axis] INVENTORIES Inventory Disclosure [Text Block] Schedule of Long-term Debt Schedule of Long-Term Debt Instruments [Table Text Block] STOCKHOLDERS' EQUITY: Equity [Abstract] Subsequent Event [Table] Subsequent Event [Table] Tax receivable agreement liability Tax Receivable Agreement Liability Tax Receivable Agreement Liability Blocker Companies Blocker Companies [Member] Blocker Companies Inventory Disclosure [Abstract] Entity Tax Identification Number Entity Tax Identification Number Redemption of LLC Units in connection with the secondary offering (in shares) Stock Redeemed or Called During Period, Shares Revenue from Contract with Customer [Abstract] 2023 (excluding the quarter ending March 26, 2023) Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year Covenants not-to-compete Noncompete Agreements [Member] Increase in term loan percent Debt Instrument, Increase (Decrease) In Basis Spread on Variable Rate Debt Instrument, Increase (Decrease) In Basis Spread on Variable Rate Transportation equipment Transportation Equipment [Member] Interest rate (as of) Debt Instrument, Interest Rate During Period NET DECREASE IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Dilutive share awards (in shares) Weighted Average Number of Shares Outstanding, Diluted, Adjustment Deferred rent and tenant allowance Straight Line Rent 2028 Finite-Lived Intangible Asset, Expected Amortization, Year Five Other intangible assets, net Other Intangible Assets, Net Entity Central Index Key Entity Central Index Key Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Measurement Frequency [Axis] Measurement Frequency [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Entity [Domain] Entity [Domain] City Area Code City Area Code General and administrative expenses General and Administrative Expense ASSETS Assets [Abstract] Other current assets Increase (Decrease) in Other Current Assets Other assets and liabilities Increase (Decrease) in Other Operating Assets and Liabilities, Net Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Statement of Stockholders' Equity [Abstract] Sale of Stock [Axis] Sale of Stock [Axis] CASH FLOWS FROM FINANCING ACTIVITIES: Net Cash Provided by (Used in) Financing Activities [Abstract] Proceeds from equity offering, net of underwriting discounts Proceeds from Issuance Initial Public Offering Long-Term Debt, Maturity, Year One Long-Term Debt, Maturity, Year One NON-CASH INVESTING AND FINANCING ACTIVITIES: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Equity-based compensation Share-Based Payment Arrangement, Noncash Expense Variable Rate [Axis] Variable Rate [Axis] Other long-term liabilities Other Liabilities, Noncurrent Net income attributable to equity method investment Income (Loss) from Equity Method Investments Asset impairment charges Asset Impairment Charges Purchase of property and equipment Payments to Acquire Property, Plant, and Equipment 2024 Finite-Lived Intangible Asset, Expected Amortization, Year One Schedule of Computations of Basic and Diluted Earnings (Loss) per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Berkshire Partners LLC Berkshire Partners LLC [Member] Berkshire Partners LLC Three-Month Secured Overnight Financing Rate Three-Month Secured Overnight Financing Rate [Member] Three-Month Secured Overnight Financing Rate Operating leases Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Interest rate at period end Line of Credit Facility, Interest Rate at Period End Cost of goods sold, excluding depreciation and amortization Cost of Sales [Member]