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Document and Entity Information
 3 Months Ended
Apr. 03, 2015
May 07, 2015
Document and Entity Information [Abstract]    
Entity Registrant Name HACKETT GROUP, INC.  
Entity Central Index Key 0001057379  
Document Type 10-Q  
Document Period End Date Apr. 03, 2015  
Amendment Flag false  
Document Fiscal Year Focus 2015  
Document Fiscal Period Focus Q1  
Current Fiscal Year End Date --01-01  
Entity Filer Category Accelerated Filer  
Entity Common Stock, Shares Outstanding   29,696,698dei_EntityCommonStockSharesOutstanding