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Document and Entity Information (USD $)
 12 Months Ended
Jan. 02, 2015
Mar. 10, 2015
Jun. 27, 2014
Document and Entity Information [Abstract]      
Entity Registrant Name HACKETT GROUP, INC.    
Entity Central Index Key 0001057379    
Document Type 10-K    
Document Period End Date Jan. 02, 2015    
Amendment Flag false    
Document Fiscal Year Focus 2014    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --01-02    
Entity Filer Category Accelerated Filer    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 132,322,230dei_EntityPublicFloat
Entity Common Stock, Shares Outstanding   29,842,993dei_EntityCommonStockSharesOutstanding