Geographic And Group Information (Revenue By Service Group) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jul. 01, 2016	Jun. 30, 2017	Jul. 01, 2016
Segment Reporting Information [Line Items]
Total revenue	$ 73,570	$ 75,613	$ 144,999	$ 144,391
The Hackett Group [Member]
Segment Reporting Information [Line Items]
Total revenue	62,472	65,747	122,721	123,692
SAP Solutions [Member]
Segment Reporting Information [Line Items]
Total revenue	$ 11,098	$ 9,866	$ 22,278	$ 20,699

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).

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

Name:	us-gaap_Revenues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration