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Document and Entity Information - USD ($)
 12 Months Ended
Jan. 01, 2021
Mar. 08, 2021
Jun. 26, 2020
Cover [Abstract]      
Trading Symbol HCKT    
Entity Registrant Name Hackett Group, Inc.    
Entity Central Index Key 0001057379    
Document Type 10-K    
Document Period End Date Jan. 01, 2021    
Amendment Flag false    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --01-01    
Entity Filer Category Accelerated Filer    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Small Business false    
Entity Shell Company false    
Entity Emerging Growth Company false    
Entity Current Reporting Status Yes    
Entity Public Float     $ 254,514,295
Entity Common Stock, Shares Outstanding   30,244,060  
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    
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 2021 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.