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Document and Entity Information
 3 Months Ended
Mar. 28, 2014
May 02, 2014
Document and Entity Information [Abstract]    
Entity Registrant Name HACKETT GROUP, INC.  
Entity Central Index Key 0001057379  
Document Type 10-Q  
Document Period End Date Mar. 28, 2014  
Amendment Flag false  
Document Fiscal Year Focus 2014  
Document Fiscal Period Focus Q1  
Current Fiscal Year End Date --01-02  
Entity Filer Category Accelerated Filer  
Entity Common Stock, Shares Outstanding   29,889,945