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Investments in Other Equity Securities Investments in Other Equity Securities (Details) (USD $)
3 Months Ended 1 Months Ended 12 Months Ended
Apr. 03, 2015
Mar. 28, 2014
Sep. 30, 2014
Dec. 31, 2014
Sep. 26, 2014
Sep. 02, 2014
Oct. 22, 2014
Schedule of Cost-method Investments [Line Items]              
Prepaid expenses and other current assets $ 30,526,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent     $ 17,539,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent      
Cost Method Investments Carrying Value 6,700,000us-gaap_CostMethodInvestments     8,600,000us-gaap_CostMethodInvestments      
Loss on impairment of long-term investment 2,505,000us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment 0us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment          
Research and development 22,329,000us-gaap_ResearchAndDevelopmentExpense 23,888,000us-gaap_ResearchAndDevelopmentExpense          
VJU GmbH [Member]              
Schedule of Cost-method Investments [Line Items]              
Noncontrolling Interest, Ownership Percentage by Parent         19.80%us-gaap_MinorityInterestOwnershipPercentageByParent
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= hlit_VJUGmbhMember
   
Cost Method Investments Original Cost         2,500,000us-gaap_CostMethodInvestmentsOriginalCost
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= hlit_VJUGmbhMember
   
Loss on impairment of long-term investment 2,500,000us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= hlit_VJUGmbhMember
           
Research and development     100,000us-gaap_ResearchAndDevelopmentExpense
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= hlit_VJUGmbhMember
       
Vislink plc [Member]              
Schedule of Cost-method Investments [Line Items]              
Noncontrolling Interest, Ownership Percentage by Parent           3.30%us-gaap_MinorityInterestOwnershipPercentageByParent
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= hlit_VislinkplcMember
 
Cost Method Investments Original Cost           3,300,000us-gaap_CostMethodInvestmentsOriginalCost
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= hlit_VislinkplcMember
 
Prepaid expenses and other current assets 1,100,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= hlit_VislinkplcMember
        3,300,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= hlit_VislinkplcMember
 
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount 3,300,000us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= hlit_VislinkplcMember
           
Cost Method Investments Carrying Value 3,100,000us-gaap_CostMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= hlit_VislinkplcMember
    2,600,000us-gaap_CostMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= hlit_VislinkplcMember
     
Unrealized Loss on Cost Method Investments 200,000us-gaap_UnrealizedGainLossOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= hlit_VislinkplcMember
    700,000us-gaap_UnrealizedGainLossOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= hlit_VislinkplcMember
     
Loss on impairment of long-term investment 0us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= hlit_VislinkplcMember
           
EDC [Member]              
Schedule of Cost-method Investments [Line Items]              
Noncontrolling Interest, Ownership Percentage by Parent             18.40%us-gaap_MinorityInterestOwnershipPercentageByParent
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= hlit_EDCMember
Cost Method Investments Original Cost             3,500,000us-gaap_CostMethodInvestmentsOriginalCost
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= hlit_EDCMember
Variable Interest Entity, Not Primary Beneficiary [Member]              
Schedule of Cost-method Investments [Line Items]              
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount 3,593,000us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember
[1]            
Cost Method Investments Carrying Value 3,593,000us-gaap_CostMethodInvestments
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember
           
Variable Interest Entity, Not Primary Beneficiary [Member] | VJU GmbH [Member]              
Schedule of Cost-method Investments [Line Items]              
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount 0us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= hlit_VJUGmbhMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember
[1]            
Variable Interest Entity, Not Primary Beneficiary [Member] | EDC [Member]              
Schedule of Cost-method Investments [Line Items]              
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount 3,593,000us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= hlit_EDCMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember
[1],[2]            
Cost Method Investments Carrying Value 3,593,000us-gaap_CostMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= hlit_EDCMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember
[2]            
Business Acquisition, Transaction Costs 100,000us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= hlit_EDCMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember
[2]            
Cost-method Investments [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | VJU GmbH [Member]              
Schedule of Cost-method Investments [Line Items]              
Cost Method Investments Carrying Value $ 0us-gaap_CostMethodInvestments
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_CostmethodInvestmentsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= hlit_VJUGmbhMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember
           
[1] The Company did not provide financial support to any of its unconsolidated VIEs and as of April 3, 2015, there were no explicit arrangements or implicit variable interests that could require the Company to provide financial support to any of its unconsolidated VIEs.
[2] maximum exposure to loss with respect to EDC as of April 3, 2015 was limited to a total investment cost of $3.6 million, including $0.1 million of transaction costs.