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Geographic And Group Information (Revenue By Service Group) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Apr. 03, 2015
Mar. 28, 2014
Segment Reporting Information [Line Items]    
Total revenue $ 60,974us-gaap_Revenues $ 54,905us-gaap_Revenues
The Hackett Group [Member]    
Segment Reporting Information [Line Items]    
Total revenue 51,592us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= hckt_HackettGroupMember
46,133us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= hckt_HackettGroupMember
ERP Solutions [Member]    
Segment Reporting Information [Line Items]    
Total revenue $ 9,382us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= hckt_ERPSolutionsMember
$ 8,772us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= hckt_ERPSolutionsMember