Quarterly Financial Information (Unaudited Supplemental Quarterly Financial Information) (Parenthetical) (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
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

Stock issued during period shares for tax benefit For exercise of SARs.

No definition available.

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Namespace Prefix:	hckt_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration