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Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Apr. 03, 2015	Mar. 28, 2014	Dec. 31, 2014 segment	Dec. 31, 2013 segment
Segment Reporting Information [Line Items]
Revenue, Net	$ 104,016us-gaap_SalesRevenueNet	$ 108,032us-gaap_SalesRevenueNet
Number of Reportable Segments			2us-gaap_NumberOfReportableSegments	1us-gaap_NumberOfReportableSegments
Income (loss) from operations	13us-gaap_OperatingIncomeLoss	(7,222)us-gaap_OperatingIncomeLoss
Operating Expenses	(55,015)us-gaap_OperatingExpenses	(59,534)us-gaap_OperatingExpenses
Stock-based compensation	(4,134)us-gaap_AllocatedShareBasedCompensationExpense	(3,807)us-gaap_AllocatedShareBasedCompensationExpense
Amortization of Intangible Assets	(1,907)us-gaap_AmortizationOfIntangibleAssets	(6,666)us-gaap_AmortizationOfIntangibleAssets
Nonoperating Income (Expense)	(2,956)us-gaap_NonoperatingIncomeExpense	89us-gaap_NonoperatingIncomeExpense
Loss before income taxes	(2,943)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	(7,133)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Video [Member]
Segment Reporting Information [Line Items]
Revenue, Net	69,282us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = hlit_VideoMember	81,152us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = hlit_VideoMember
Cable Edge [Member]
Segment Reporting Information [Line Items]
Revenue, Net	34,734us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = hlit_CableEdgeMember	26,880us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = hlit_CableEdgeMember
Operating Segments [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations	6,098us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember	3,479us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Operating Segments [Member] | Video [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations	(90)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = hlit_VideoMember	2,435us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = hlit_VideoMember
Operating Segments [Member] | Cable Edge [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations	6,188us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = hlit_CableEdgeMember	1,044us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = hlit_CableEdgeMember
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Operating Expenses	$ (44)us-gaap_OperatingExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember	$ (228)us-gaap_OperatingExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember

X

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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- Definition

Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business).

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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