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Geographic and Group Information (Narrative) (Details) - USD ($) $ in Millions	Sep. 25, 2020	Dec. 27, 2019
Segment Reporting [Abstract]
Goodwill included in foreign assets	$ 14.3	$ 14.6

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

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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