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Geographic and Group Information (Revenue By Service Group) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2017	Sep. 30, 2016	Sep. 29, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Total revenue	$ 71,462	$ 74,118	$ 216,461	$ 218,509
The Hackett Group [Member]
Segment Reporting Information [Line Items]
Total revenue	60,789	62,610	183,510	186,302
SAP Solutions [Member]
Segment Reporting Information [Line Items]
Total revenue	$ 10,673	$ 11,508	$ 32,951	$ 32,207

X

- 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=63488584&loc=d3e20235-122688

+ Details

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Details

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Namespace Prefix:
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X

- Details

Name:	us-gaap_ProductOrServiceAxis=hckt_SAPSolutionsMember
Namespace Prefix:
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Balance Type:
Period Type: