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v2.4.1.9

Restructuring and Related Charges - Activities in Restructuring Accrual (Detail) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 03, 2015 | Mar. 28, 2014 | Dec. 31, 2014
Restructuring Cost and Reserve [Line Items] |  |  |
Product cost of revenue | $ 0 us-gaap_ProductionRelatedImpairmentsOrCharges | $ 79,000 us-gaap_ProductionRelatedImpairmentsOrCharges |
Restructuring and related charges | 44,000 us-gaap_RestructuringCharges | 149,000 us-gaap_RestructuringCharges |
Restructuring and Related Cost, Incurred Cost | 44,000 us-gaap_RestructuringAndRelatedCostIncurredCost | 228,000 us-gaap_RestructuringAndRelatedCostIncurredCost |
Harmonic Two Thousand And Fifteen Restructuring [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Beginning Balance | 322,000 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = hlit_HarmonicTwoThousandAndFifteenRestructuringMember |  |
Restructuring charges | 56,000 us-gaap_BusinessExitCosts1 / us-gaap_RestructuringPlanAxis = hlit_HarmonicTwoThousandAndFifteenRestructuringMember |  | 2,200,000 us-gaap_BusinessExitCosts1 / us-gaap_RestructuringPlanAxis = hlit_HarmonicTwoThousandAndFifteenRestructuringMember
Adjustments to restructuring provisions | (12,000)us-gaap_RestructuringReserveAccrualAdjustment / us-gaap_RestructuringPlanAxis = hlit_HarmonicTwoThousandAndFifteenRestructuringMember |  |
Cash payments | (321,000)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = hlit_HarmonicTwoThousandAndFifteenRestructuringMember |  |
Non-cash write-offs | 2,000 us-gaap_RestructuringReserveSettledWithoutCash1 / us-gaap_RestructuringPlanAxis = hlit_HarmonicTwoThousandAndFifteenRestructuringMember |  |
Ending Balance | 47,000 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = hlit_HarmonicTwoThousandAndFifteenRestructuringMember |  | 322,000 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = hlit_HarmonicTwoThousandAndFifteenRestructuringMember
Harmonic Two Thousand And Fifteen Restructuring [Member] | Employee Severance And Benefit Arrangements [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and Related Cost, Incurred Cost | 44,000 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_RestructuringCostAndReserveAxis = hlit_EmployeeSeveranceAndBenefitArrangementsMember / us-gaap_RestructuringPlanAxis = hlit_HarmonicTwoThousandAndFifteenRestructuringMember |  |
Restructuring Reserve [Roll Forward] |  |  |
Beginning Balance | 305,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = hlit_EmployeeSeveranceAndBenefitArrangementsMember / us-gaap_RestructuringPlanAxis = hlit_HarmonicTwoThousandAndFifteenRestructuringMember |  |
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
Adjustments to restructuring provisions | (5,000)us-gaap_RestructuringReserveAccrualAdjustment / us-gaap_RestructuringCostAndReserveAxis = hlit_EmployeeSeveranceAndBenefitArrangementsMember / us-gaap_RestructuringPlanAxis = hlit_HarmonicTwoThousandAndFifteenRestructuringMember |  |
Cash payments | (312,000)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = hlit_EmployeeSeveranceAndBenefitArrangementsMember / us-gaap_RestructuringPlanAxis = hlit_HarmonicTwoThousandAndFifteenRestructuringMember |  |
Non-cash write-offs | 0 us-gaap_RestructuringReserveSettledWithoutCash1 / us-gaap_RestructuringCostAndReserveAxis = hlit_EmployeeSeveranceAndBenefitArrangementsMember / us-gaap_RestructuringPlanAxis = hlit_HarmonicTwoThousandAndFifteenRestructuringMember |  |
Ending Balance | 44,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = hlit_EmployeeSeveranceAndBenefitArrangementsMember / us-gaap_RestructuringPlanAxis = hlit_HarmonicTwoThousandAndFifteenRestructuringMember |  | 305,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = hlit_EmployeeSeveranceAndBenefitArrangementsMember / us-gaap_RestructuringPlanAxis = hlit_HarmonicTwoThousandAndFifteenRestructuringMember
Harmonic Two Thousand And Fifteen Restructuring [Member] | Other Restructuring [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Beginning Balance | 17,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember / us-gaap_RestructuringPlanAxis = hlit_HarmonicTwoThousandAndFifteenRestructuringMember |  |
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
Adjustments to restructuring provisions | (7,000)us-gaap_RestructuringReserveAccrualAdjustment / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember / us-gaap_RestructuringPlanAxis = hlit_HarmonicTwoThousandAndFifteenRestructuringMember |  |
Cash payments | (9,000)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember / us-gaap_RestructuringPlanAxis = hlit_HarmonicTwoThousandAndFifteenRestructuringMember |  |
Non-cash write-offs | 2,000 us-gaap_RestructuringReserveSettledWithoutCash1 / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember / us-gaap_RestructuringPlanAxis = hlit_HarmonicTwoThousandAndFifteenRestructuringMember |  |
Ending Balance | $ 3,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember / us-gaap_RestructuringPlanAxis = hlit_HarmonicTwoThousandAndFifteenRestructuringMember |  | $ 17,000 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember / us-gaap_RestructuringPlanAxis = hlit_HarmonicTwoThousandAndFifteenRestructuringMember

X
- 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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Period Type: | duration

X
- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with 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 + Details
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Balance Type: | credit
Period Type: | duration

X
- Definition Nonrecurring impairment charges related to the write-off of production-related equipment and inventory. This tag is used when an Entity charges this cost to cost of goods sold. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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X
- 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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Period Type: | duration

X
- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to 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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- Details
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X
- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: 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 2: 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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X
- Definition Amount of any reversal and other adjustment made during the period to the amount of a previously accrued liability for a specified type of restructuring cost, excluding adjustments for costs incurred during the period, costs settled during the period, and foreign currency translation adjustments. + 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 40 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6394291&loc=d3e17658-110867 + Details
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- Details
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- Definition Amount of consideration other than cash used to fully or partially settle an accrued 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 SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 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)(2)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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