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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 27, 2024
Feb. 24, 2025
Jun. 28, 2024
Cover [Abstract]      
Trading Symbol HCKT    
Entity Registrant Name Hackett Group, Inc.    
Entity Central Index Key 0001057379    
Document Type 10-K    
Document Period End Date Dec. 27, 2024    
Amendment Flag false    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --12-27    
Entity Filer Category Accelerated Filer    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Small Business false    
Document Financial Statement Error Correction false    
Entity Shell Company false    
Entity Emerging Growth Company false    
Entity Current Reporting Status Yes    
Entity Public Float     $ 126,269,893
Entity Common Stock, Shares Outstanding   27,791,221  
Title of 12(b) Security Common Stock, par value $.001 per share    
Security Exchange Name NASDAQ    
Entity Interactive Data Current Yes    
Entity File Number 333-48123    
Entity Tax Identification Number 65-0750100    
Entity Address, Address Line One 1001 Brickell Bay Drive    
Entity Address, Address Line Two Suite 3000    
Entity Address, City or Town Miami    
Entity Address, State or Province FL    
Entity Address, Postal Zip Code 33131    
City Area Code 305    
Local Phone Number 375-8005    
Entity Incorporation, State or Country Code FL    
Document Annual Report true    
Document Transition Report false    
ICFR Auditor Attestation Flag true    
Auditor Name RSM US LLP    
Auditor Firm ID 49    
Auditor Location Coral Gables, Florida    
Documents Incorporated by Reference

Part III of this Annual Report on Form 10-K incorporates by reference certain portions of the registrant’s proxy statement for its 2024 Annual Meeting of Shareholders to be filed with the Commission not later than 120 days after the end of the fiscal year covered by this report.

    
Auditor Opinion

Opinion on the Financial Statements

We have audited the accompanying consolidated balance sheets of The Hackett Group, Inc. and its subsidiaries (the Company) as of December 27, 2024 and December 29, 2023, the related consolidated statements of operations, comprehensive income, shareholders’ equity and cash flows for each of the three years in the period ended December 27, 2024, and the related notes to the consolidated financial statements and schedule (collectively, the financial statements). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company as of December 27, 2024 and December 29, 2023, and the results of its operations and its cash flows for each of the three years in the period ended December 27, 2024, in conformity with accounting principles generally accepted in the United States of America.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company’s internal control over financial reporting as of December 27, 2024, based on criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission in 2013, and our report dated February 28, 2025 expressed an unqualified opinion on the effectiveness of the Company’s internal control over financial reporting.