Business combination consideration transferred equity interests issued and issuable vesting period.

No definition available.

Name:	hckt_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuableVestingPeriod
Namespace Prefix:	hckt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Business combination contingent consideration arrangements period.

+ References

No definition available.

+ Details

Name:	hckt_BusinessCombinationContingentConsiderationArrangementsPeriod
Namespace Prefix:	hckt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Business combination contingent consideration cash share based compensation benefit expense.

+ References

No definition available.

+ Details

Name:	hckt_BusinessCombinationContingentConsiderationCashShareBasedCompensationBenefitExpense
Namespace Prefix:	hckt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e848-128460

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e845-128460

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

+ Details

Name:	us-gaap_BusinessAcquisitionEffectiveDateOfAcquisition1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_BusinessAcquisitionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

+ Details

Name:	us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6613-128477

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6578-128477

+ Details

Name:	us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 35
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476

+ Details

Name:	us-gaap_BusinessCombinationContingentConsiderationLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

+ Details

Name:	us-gaap_PaymentsToAcquireBusinessesGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

+ Details

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_BusinessAcquisitionAxis=hckt_JibeConsultingIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_CostOfSalesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TitleOfIndividualAxis=hckt_SellingShareholdersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TitleOfIndividualAxis=hckt_KeyEmployeesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ContingentConsiderationByTypeAxis=hckt_CashContingentConsiderationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ContingentConsiderationByTypeAxis=hckt_StockBasedContingentConsiderationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=hckt_AecusLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TitleOfIndividualAxis=hckt_SellersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TitleOfIndividualAxis=hckt_KeyPersonnelMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=hckt_CharteredInstituteOfManagementAccountantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Acquisitions (Narrative) (Details) $ in Thousands, £ in Millions			1 Months Ended	3 Months Ended		6 Months Ended
	May 01, 2017 USD ($)	Apr. 06, 2017 GBP (£)	Oct. 31, 2017 USD ($)	Jun. 28, 2019 USD ($)	Jun. 29, 2018 USD ($)	Jun. 28, 2019 USD ($)	Jun. 29, 2018 USD ($)
Business Acquisition [Line Items]
Non-cash stock compensation expense						$ 3,802	$ 4,412
Jibe Consulting, Inc [Member]
Business Acquisition [Line Items]
Effective date of acquisition	May 01, 2017
Purchase consideration	$ 5,400
Purchase consideration, common stock	$ 3,600
Common stock vesting period	4 years
Contingent consideration	$ 11,000
Contingent consideration performance period	18 months
Jibe Consulting, Inc [Member] \| Cost of Sales [Member]
Business Acquisition [Line Items]
Non-cash stock compensation expense						200
Jibe Consulting, Inc [Member] \| Selling Shareholder's [Member]
Business Acquisition [Line Items]
Cash compensation (expense) benefit				$ (45)	$ 4,600	1,000	$ 4,600
Jibe Consulting, Inc [Member] \| Key Employees [Member]
Business Acquisition [Line Items]
Cash compensation (expense) benefit						$ 100
Jibe Consulting, Inc [Member] \| Cash Contingent Consideration [Member]
Business Acquisition [Line Items]
Contingent consideration	$ 6,600
Jibe Consulting, Inc [Member] \| Stock Based Contingent Consideration [Member]
Business Acquisition [Line Items]
Contingent consideration	$ 4,400
Aecus Limited [Member]
Business Acquisition [Line Items]
Effective date of acquisition		Apr. 06, 2017
Purchase consideration \| £		£ 3.2
Contingent consideration performance period		12 months
Acquired percentage		100.00%
Aecus Limited [Member] \| Cash Contingent Consideration [Member] \| Sellers [Member]
Business Acquisition [Line Items]
Contingent consideration \| £		£ 2.4
Aecus Limited [Member] \| Cash Contingent Consideration [Member] \| Key Personnel [Member]
Business Acquisition [Line Items]
Contingent consideration \| £		0.3
Aecus Limited [Member] \| Stock Based Contingent Consideration [Member] \| Key Personnel [Member]
Business Acquisition [Line Items]
Contingent consideration \| £		£ 0.3
The Chartered Institute of Management Accountants [Member]
Business Acquisition [Line Items]
Purchase consideration			$ 2,000