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Quarterly Financial Information (Unaudited Supplemental Quarterly Financial Information) (Parenthetical) (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended
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Dec. 31, 2021 | Jul. 02, 2021
Income Statement [Abstract] |  |
Software sale transaction |  | $ 5.3
Number shares from tax benefit for the exercise of SARs | 2.9 |
Tax benefit from exercise of SARs | $ 7.7 |

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- Definition Software sale transaction. + References No definition available. + Details
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Namespace Prefix: | hckt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Stock issued during period shares for tax benefit For exercise of SARs. + References No definition available. + Details
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Namespace Prefix: | hckt_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Tax benefit from exercise of SARs + References No definition available. + Details
Name: | hckt_TaxBenefitFromExerciseOfSars
Namespace Prefix: | hckt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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