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Geographic and Group Information (Narrative) (Details) - USD ($) $ in Millions	Sep. 29, 2017	Dec. 30, 2016
Segment Reporting [Abstract]
Goodwill included in foreign assets	$ 15.0	$ 11.9

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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