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Stock Based Compensation (Narrative) (Details) (USD $)
0 Months Ended 12 Months Ended 1 Months Ended
Feb. 08, 2012
Jan. 02, 2015
Dec. 27, 2013
Dec. 28, 2012
Mar. 31, 2013
Jan. 01, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Total share based compensation   $ 6,370,000us-gaap_ShareBasedCompensation $ 6,119,000us-gaap_ShareBasedCompensation $ 5,522,000us-gaap_ShareBasedCompensation    
Performance based stock option grant       3,196,563us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross    
Shares available for future issuance   1,726,938us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant        
Fair value $ 1.31us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue          
Performance based stock option grant, Exercise price $ 4.00us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice     $ 4.00us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice    
Restricted Stock Units (RSUs) [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Total share based compensation   5,000,000us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
4,800,000us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
4,200,000us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
   
Restricted stock units, vesting schedules options one   4 years        
Restricted stock units, vesting schedules options two   4 years        
Restricted stock units, vesting schedules options three   3 years        
Percentage of vesting on restricted stock, option two, First anniversary   25.00%hckt_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentageUnderOptionTwoDuringAnniversaryOne
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
       
Percentage of vesting on restricted stock, option three, First anniversary   33.00%hckt_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentageUnderOptionThreeDuringAnniversaryOne
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
       
Percentage of vesting on restricted stock, option one, Second anniversary   50.00%hckt_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentageUnderOptionOneDuringAnniversaryTwo
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
       
Percentage of vesting on restricted stock, option two, Second anniversary   25.00%hckt_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentageUnderOptionTwoDuringAnniversaryTwo
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
       
Percentage of vesting on restricted stock, option three, Second anniversary   33.00%hckt_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentageUnderOptionThreeDuringAnniversaryTwo
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
       
Percentage of vesting on restricted stock, option one, Third anniversary   25.00%hckt_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentageUnderOptionOneDuringAnniversaryThree
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
       
Percentage of vesting on restricted stock, option two, Third anniversary   25.00%hckt_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentageUnderOptionTwoDuringAnniversaryThree
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
       
Percentage of vesting on restricted stock, option three, Third anniversary   33.00%hckt_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentageUnderOptionThreeDuringAnniversaryThree
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
       
Percentage of vesting on restricted stock, option one, Fourth anniversary   25.00%hckt_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentageUnderOptionOneDuringAnniversaryFour
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
       
Percentage of vesting on restricted stock, option two, Fourth anniversary   25.00%hckt_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentageUnderOptionTwoDuringAnniversaryFour
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
       
Compensation expense related to nonvested restricted stock unit based awards   6,500,000hckt_EmployeeServiceShareBasedCompensationNonvestedRestrictedStockUnitAwardsNetCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
       
Weighted average period, Restricted stock units   1 year 11 months 9 days        
Common Stock Subject to Vesting Requirements [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Total share based compensation   900,000us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= hckt_CommonStockSubjectToVestingRequirementsMember
800,000us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= hckt_CommonStockSubjectToVestingRequirementsMember
700,000us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= hckt_CommonStockSubjectToVestingRequirementsMember
   
Options vesting period   5 years        
Compensation expense related to common stock subject to vesting requirements   1,000,000hckt_FutureCompensationExpenseRelatedToNonvestedCommonStockSubjectToVestingRequirements
/ us-gaap_AwardTypeAxis
= hckt_CommonStockSubjectToVestingRequirementsMember
       
Weighted average period, Common stock   3 years        
Performance Shares [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Total share based compensation   500,000us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
500,000us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
600,000us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
   
Performance based stock option grant 2,916,563us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
    2,916,563us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
2,916,563us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
 
Existing restricted stock unit Exchange Percentage 50.00%hckt_ExistingRestrictedStockUnitBonusOpportunity
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
         
Growth of Pro-forma EPS Percentage 50.00%hckt_PerformanceBasedStockOptionGrantProFormaEpsGrowthForVesting
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
         
Growth of Pro-forma EBITDA percentage 50.00%hckt_PerformanceBasedStockOptionGrantProFormaEbitdaGrowthForVesting
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
         
Performance based stock option vesting term   6 years        
Trailing period   12 months        
Percentage of outstanding option on performance based   100.00%hckt_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfOutstandingOptionOnPerformanceBased
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
       
Performance Shares [Member] | Chief Executive Officer [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Performance based stock option grant 1,912,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
         
Performance Shares [Member] | Chief Operating Officer [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Performance based stock option grant 1,004,063us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefOperatingOfficerMember
         
Stock Appreciation Rights (SARs) [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Surrendered shares     470,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOtherIncreasesDecreasesInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
     
Stock Appreciation Rights (SARs) And Stock Options [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Fair value       $ 1.31us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= hckt_StockAppreciationRightsSarsAndStockOptionsMember
   
Minimum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Options vesting period   4 years        
Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Options vesting period   10 years        
Technolab International Corporation [Member] | Common Stock Subject to Vesting Requirements [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Total share based compensation   0us-gaap_ShareBasedCompensation
/ us-gaap_BusinessAcquisitionAxis
= hckt_TechnolabInternationalCorporationMember
/ us-gaap_ContingentConsiderationByTypeAxis
= hckt_CommonStockSubjectToVestingRequirementsMember
       
Options vesting period   4 years        
Technolab International Corporation [Member] | Scenario, Forecast [Member] | Common Stock Subject to Vesting Requirements [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Share-based Liabilities Paid           $ 4,600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsTotalShareBasedLiabilitiesPaid
/ us-gaap_BusinessAcquisitionAxis
= hckt_TechnolabInternationalCorporationMember
/ us-gaap_ContingentConsiderationByTypeAxis
= hckt_CommonStockSubjectToVestingRequirementsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember