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Document and Entity Information - shares	3 Months Ended
	Mar. 30, 2018	May 07, 2018
Document And Entity Information [Abstract]
Trading Symbol	HCKT
Entity Registrant Name	HACKETT GROUP, INC.
Entity Central Index Key	0001057379
Document Type	10-Q
Document Period End Date	Mar. 30, 2018
Amendment Flag	false
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-29
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		29,409,225

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Number 240
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