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Document and Entity Information	9 Months Ended
	Sep. 26, 2014	Nov. 01, 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	Sep. 26, 2014
Amendment Flag	false
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--01-02
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		29,199,287

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