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COVER PAGE - shares
 3 Months Ended
Mar. 26, 2023
Jul. 27, 2023
Cover [Abstract]    
Document Type 10-Q/A  
Document Quarterly Report true  
Document Period End Date Mar. 26, 2023  
Document Transition Report false  
Entity File Number 001-40951  
Entity Registrant Name PORTILLO'S INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 87-1104304  
Entity Address, Address Line One 2001 Spring Road  
Entity Address, Address Line Two Suite 400  
Entity Address, City or Town Oak Brook  
Entity Address, State or Province IL  
Entity Address, Postal Zip Code 60523  
City Area Code 630  
Local Phone Number 954-3773  
Title of 12(b) Security Class A common stock, $0.01 par value per share  
Trading Symbol PTLO  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding (in shares)   55,101,465
Amendment Description Portillo’s Inc. is filing this Amendment No. 1 (this “Amendment”) to its Quarterly Report on Form 10-Q for the period ended March 26, 2023 (the “Original 10-Q”) as an exhibits-only filing in order to file amended Certifications of Principal Executive Officer and Principal Financial Officer Pursuant to Securities Exchange Act Rules 13a-14(a) and 15(d)-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. This Amendment does not reflect events occurring after the date of the filing of the Original 10-Q or modify or update any of the other disclosures contained therein in any way. Accordingly, this Amendment should be read in conjunction with the Original 10-Q. This Amendment consists solely of the preceding cover page, this Explanatory Note, the Exhibit Index, the signature page and Exhibits 31.1 and 31.2.  
Entity Central Index Key 0001871509  
Amendment Flag true  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2023  
Document Fiscal Period Focus Q1