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Geographic and Service Group Information (Narrative) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Jan. 01, 2021
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Segment Reporting [Abstract] |  |
Goodwill included in foreign assets | $ 15.1 | $ 15.3

X
- 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

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