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Basis of Presentation and General Information (Carrying Amount And Activity Of Goodwill)(Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 02, 2015	Dec. 27, 2013
Carrying amount and activity of goodwill
Goodwill, Beginning Balance	$ 76,283us-gaap_Goodwill	$ 76,220us-gaap_Goodwill
Allocation of goodwill related to discontinued operations		(199)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit
Foreign currency translation adjustment	(854)us-gaap_GoodwillTranslationAdjustments	262us-gaap_GoodwillTranslationAdjustments
Goodwill, Ending Balance	75,429us-gaap_Goodwill	76,283us-gaap_Goodwill
The Hackett Group [Member]
Carrying amount and activity of goodwill
Goodwill, Beginning Balance	45,149us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	44,887us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Foreign currency translation adjustment	(854)us-gaap_GoodwillTranslationAdjustments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	262us-gaap_GoodwillTranslationAdjustments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Goodwill, Ending Balance	44,295us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	45,149us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Hackett Technology Solutions [Member]
Carrying amount and activity of goodwill
Goodwill, Beginning Balance		31,333us-gaap_Goodwill / dei_LegalEntityAxis = hckt_HackettTechnologySolutionsMember
Allocation of goodwill related to discontinued operations		(199)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit / dei_LegalEntityAxis = hckt_HackettTechnologySolutionsMember
Goodwill, Ending Balance	$ 31,134us-gaap_Goodwill / dei_LegalEntityAxis = hckt_HackettTechnologySolutionsMember	$ 31,134us-gaap_Goodwill / dei_LegalEntityAxis = hckt_HackettTechnologySolutionsMember

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

+ Details

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X

- Details

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X

- Definition

Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (f)

-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267

+ Details

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X

- Definition

Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267

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Data Type:	na
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X

- Details

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Namespace Prefix:
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