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Document and Entity Information - shares	6 Months Ended
	Jul. 03, 2015	Aug. 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	Jul. 03, 2015
Amendment Flag	false
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--01-01
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		29,759,535

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