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Restructuring and Related Charges - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 03, 2015 | Mar. 28, 2014 | Dec. 31, 2014 | Dec. 31, 2013
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and Related Cost, Incurred Cost | $ 44,000 us-gaap_RestructuringAndRelatedCostIncurredCost | $ 228,000 us-gaap_RestructuringAndRelatedCostIncurredCost |  |
Harmonic Two Thousand And Fifteen Restructuring [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | 56,000 us-gaap_BusinessExitCosts1 / us-gaap_RestructuringPlanAxis = hlit_HarmonicTwoThousandAndFifteenRestructuringMember |  | 2,200,000 us-gaap_BusinessExitCosts1 / us-gaap_RestructuringPlanAxis = hlit_HarmonicTwoThousandAndFifteenRestructuringMember |
Harmonic 2013 Restructuring [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and Related Cost, Incurred Cost |  | 200,000 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_RestructuringPlanAxis = hlit_HarmonicTwoThousandAndThirteenRestructuringMember | 900,000 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_RestructuringPlanAxis = hlit_HarmonicTwoThousandAndThirteenRestructuringMember | 2,200,000 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_RestructuringPlanAxis = hlit_HarmonicTwoThousandAndThirteenRestructuringMember
Fixed Asset Impairment [Member] | Harmonic Two Thousand And Fifteen Restructuring [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges |  |  | 1,100,000 us-gaap_BusinessExitCosts1 / us-gaap_RestructuringCostAndReserveAxis = hlit_FixedAssetImpairmentMember / us-gaap_RestructuringPlanAxis = hlit_HarmonicTwoThousandAndFifteenRestructuringMember |
Contract Termination [Member] | Harmonic Two Thousand And Fifteen Restructuring [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges |  |  | 300,000 us-gaap_BusinessExitCosts1 / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember / us-gaap_RestructuringPlanAxis = hlit_HarmonicTwoThousandAndFifteenRestructuringMember |
Other Restructuring [Member] | Harmonic Two Thousand And Fifteen Restructuring [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | 0 us-gaap_BusinessExitCosts1 / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember / us-gaap_RestructuringPlanAxis = hlit_HarmonicTwoThousandAndFifteenRestructuringMember |  | 100,000 us-gaap_BusinessExitCosts1 / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember / us-gaap_RestructuringPlanAxis = hlit_HarmonicTwoThousandAndFifteenRestructuringMember |
Employee Severance And Benefit Arrangements [Member] | Harmonic Two Thousand And Fifteen Restructuring [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | 56,000 us-gaap_BusinessExitCosts1 / us-gaap_RestructuringCostAndReserveAxis = hlit_EmployeeSeveranceAndBenefitArrangementsMember / us-gaap_RestructuringPlanAxis = hlit_HarmonicTwoThousandAndFifteenRestructuringMember |  | 600,000 us-gaap_BusinessExitCosts1 / us-gaap_RestructuringCostAndReserveAxis = hlit_EmployeeSeveranceAndBenefitArrangementsMember / us-gaap_RestructuringPlanAxis = hlit_HarmonicTwoThousandAndFifteenRestructuringMember |
Number of positions eliminated | 2 us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated / us-gaap_RestructuringCostAndReserveAxis = hlit_EmployeeSeveranceAndBenefitArrangementsMember / us-gaap_RestructuringPlanAxis = hlit_HarmonicTwoThousandAndFifteenRestructuringMember |  | 19 us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated / us-gaap_RestructuringCostAndReserveAxis = hlit_EmployeeSeveranceAndBenefitArrangementsMember / us-gaap_RestructuringPlanAxis = hlit_HarmonicTwoThousandAndFifteenRestructuringMember |
Restructuring and Related Cost, Incurred Cost | $ 44,000 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_RestructuringCostAndReserveAxis = hlit_EmployeeSeveranceAndBenefitArrangementsMember / us-gaap_RestructuringPlanAxis = hlit_HarmonicTwoThousandAndFifteenRestructuringMember |  |  |
Employee Severance And Benefit Arrangements [Member] | Harmonic 2013 Restructuring [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number of positions eliminated |  | 8 us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated / us-gaap_RestructuringCostAndReserveAxis = hlit_EmployeeSeveranceAndBenefitArrangementsMember / us-gaap_RestructuringPlanAxis = hlit_HarmonicTwoThousandAndThirteenRestructuringMember |  |

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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Includes, but is not limited to, one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and termination benefits associated with an ongoing benefit arrangement. Excludes expenses associated with special or contractual termination benefits, a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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- Definition Discloses the amount charged against the accrued restructuring reserves, or earnings if not previously accrued, during the period for the specified type of restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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- Definition The number of positions eliminated during the period as a result of restructuring activities. + References No definition available. + Details
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