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Geographic and Service Group Information (Revenue By Service Group) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 28, 2018	Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Dec. 29, 2017	Sep. 29, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Segment Reporting Information [Line Items]
Revenue from continuing operations before reimbursement									$ 285,887	$ 276,599	$ 279,787
Revenue Before Reimbursements [Member]
Segment Reporting Information [Line Items]
Revenue from continuing operations before reimbursement	$ 61,595	$ 68,183	$ 68,706	$ 66,039	$ 62,307	$ 63,742	$ 65,679	$ 63,403	264,523	255,131	252,096
The Hackett Group [Member] | Revenue Before Reimbursements [Member]
Segment Reporting Information [Line Items]
Revenue from continuing operations before reimbursement									230,972	215,275	213,949
SAP Solutions [Member] | Revenue Before Reimbursements [Member]
Segment Reporting Information [Line Items]
Revenue from continuing operations before reimbursement									$ 33,551	$ 39,856	$ 38,147

X

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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+ References

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