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v3.20.4

Geographic and Service Group Information (Narrative) (Details) - USD ($) $ in Millions | Jan. 01, 2021 | Dec. 27, 2019
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Segment Reporting [Abstract] |  |
Goodwill included in foreign assets | $ 15.3 | $ 14.6

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- Definition Goodwill included in foreign asset. + References No definition available. + Details
Name: | hckt_GoodwillIncludedInForeignAsset
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