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Stock-Based Compensation - Employee Stock Purchase Plan (Detail) (Employee Stock Purchase Plan [Member], USD $) | 3 Months Ended | 6 Months Ended
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Apr. 03, 2015 | Jun. 30, 2014 | Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expected dividends | 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate |  |
Purchase Period June 30, 2014 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expected term (years) |  | 0 years 6 months 1 day |
Volatility |  | 29.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate / us-gaap_AwardDateAxis = hlit_PurchasePeriodJune302014Member / us-gaap_AwardTypeAxis = hlit_EmployeeStockPurchasePlanMember |
Risk-free interest rate |  | 0.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardDateAxis = hlit_PurchasePeriodJune302014Member / us-gaap_AwardTypeAxis = hlit_EmployeeStockPurchasePlanMember |
Expected dividends |  | 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardDateAxis = hlit_PurchasePeriodJune302014Member / us-gaap_AwardTypeAxis = hlit_EmployeeStockPurchasePlanMember |
Estimated weighted average fair value per share at purchase date |  | $ 1.71 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardDateAxis = hlit_PurchasePeriodJune302014Member / us-gaap_AwardTypeAxis = hlit_EmployeeStockPurchasePlanMember |
Purchase Period June 30, 2015 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expected term (years) | 0 years 5 months 27 days |  |
Volatility | 35.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate / us-gaap_AwardDateAxis = hlit_PurchasePeriodJune302015Member / us-gaap_AwardTypeAxis = hlit_EmployeeStockPurchasePlanMember |  |
Risk-free interest rate | 0.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardDateAxis = hlit_PurchasePeriodJune302015Member / us-gaap_AwardTypeAxis = hlit_EmployeeStockPurchasePlanMember |  |
Expected dividends | 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardDateAxis = hlit_PurchasePeriodJune302015Member / us-gaap_AwardTypeAxis = hlit_EmployeeStockPurchasePlanMember |  |
Scenario, Forecast [Member] | Purchase Period June 30, 2015 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Estimated weighted average fair value per share at purchase date |  |  | $ 1.74 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardDateAxis = hlit_PurchasePeriodJune302015Member / us-gaap_AwardTypeAxis = hlit_EmployeeStockPurchasePlanMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average expected volatility rate of share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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