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Geographic And Service Group Information (Revenue By Service Group) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Jan. 02, 2015	Sep. 26, 2014	Jun. 27, 2014	Mar. 28, 2014	Dec. 27, 2013	Sep. 27, 2013	Jun. 28, 2013	Mar. 29, 2013	Jan. 02, 2015	Dec. 27, 2013	Dec. 28, 2012
Segment Reporting Information [Line Items]
Total revenue	$ 60,343us-gaap_Revenues	$ 60,437us-gaap_Revenues	$ 61,052us-gaap_Revenues	$ 54,905us-gaap_Revenues	$ 52,604us-gaap_Revenues	$ 57,916us-gaap_Revenues	$ 58,961us-gaap_Revenues	$ 54,349us-gaap_Revenues	$ 236,737us-gaap_Revenues	$ 223,830us-gaap_Revenues	$ 222,736us-gaap_Revenues
The Hackett Group [Member]
Segment Reporting Information [Line Items]
Total revenue									196,145us-gaap_Revenues / us-gaap_ProductOrServiceAxis = hckt_HackettGroupMember	184,112us-gaap_Revenues / us-gaap_ProductOrServiceAxis = hckt_HackettGroupMember	187,787us-gaap_Revenues / us-gaap_ProductOrServiceAxis = hckt_HackettGroupMember
ERP Solutions [Member]
Segment Reporting Information [Line Items]
Total revenue									$ 40,592us-gaap_Revenues / us-gaap_ProductOrServiceAxis = hckt_ERPSolutionsMember	$ 39,718us-gaap_Revenues / us-gaap_ProductOrServiceAxis = hckt_ERPSolutionsMember	$ 34,949us-gaap_Revenues / us-gaap_ProductOrServiceAxis = hckt_ERPSolutionsMember

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

+ Details

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