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Geographic and Service Group Information (Narrative) (Details) - USD ($) $ in Millions | Dec. 29, 2017 | Dec. 30, 2016 | Jan. 01, 2016
--- | --- | --- | ---
Segment Reporting [Abstract] |  |  |
Goodwill included in foreign assets | $ 15.1 | $ 11.9 | $ 14.1

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- Definition Goodwill included in foreign asset. + References No definition available. + Details
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Namespace Prefix: | hckt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration