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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 | $ 30,526,000 us-gaap_PrepaidExpenseAndOtherAssetsCurrent |  |  |  | $ 17,539,000 us-gaap_PrepaidExpenseAndOtherAssetsCurrent |  |  |
Cost Method Investments Carrying Value | 6,700,000 us-gaap_CostMethodInvestments |  |  |  | 8,600,000 us-gaap_CostMethodInvestments |  |  |
Loss on impairment of long-term investment | 2,505,000 us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment |  | 0 us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment |  |  |  |  |
Research and development | 22,329,000 us-gaap_ResearchAndDevelopmentExpense |  | 23,888,000 us-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 |  |  |  |  |  | 2,500,000 us-gaap_CostMethodInvestmentsOriginalCost / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = hlit_VJUGmbhMember |  |
Loss on impairment of long-term investment | 2,500,000 us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = hlit_VJUGmbhMember |  |  |  |  |  |  |
Research and development |  |  |  | 100,000 us-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 |  |  |  |  |  |  | 3,300,000 us-gaap_CostMethodInvestmentsOriginalCost / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = hlit_VislinkplcMember |
Prepaid expenses and other current assets | 1,100,000 us-gaap_PrepaidExpenseAndOtherAssetsCurrent / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = hlit_VislinkplcMember |  |  |  |  |  | 3,300,000 us-gaap_PrepaidExpenseAndOtherAssetsCurrent / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = hlit_VislinkplcMember |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | 3,300,000 us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = hlit_VislinkplcMember |  |  |  |  |  |  |
Cost Method Investments Carrying Value | 3,100,000 us-gaap_CostMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = hlit_VislinkplcMember |  |  |  | 2,600,000 us-gaap_CostMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = hlit_VislinkplcMember |  |  |
Unrealized Loss on Cost Method Investments | 200,000 us-gaap_UnrealizedGainLossOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = hlit_VislinkplcMember |  |  |  | 700,000 us-gaap_UnrealizedGainLossOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = hlit_VislinkplcMember |  |  |
Loss on impairment of long-term investment | 0 us-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 |  |  |  |  |  |  |  | 3,500,000 us-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 | 3,593,000 us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember | [1] |  |  |  |  |  |
Cost Method Investments Carrying Value | 3,593,000 us-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 | 0 us-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 | 3,593,000 us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = hlit_EDCMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember | [1],[2] |  |  |  |  |  |
Cost Method Investments Carrying Value | 3,593,000 us-gaap_CostMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = hlit_EDCMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember | [2] |  |  |  |  |  |
Business Acquisition, Transaction Costs | 100,000 us-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 | $ 0 us-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.

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