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Employee Benefit Plans - Additional Information (Detail) (USD $) | 3 Months Ended
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Apr. 03, 2015 | Mar. 28, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Intrinsic value of options exercised | $ 1,300,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue | $ 100,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Increase in authorized shares for ESPP |  |
Discretionary contributions of plan | 25.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch |
Percent of employees' gross pay eligible for matching | 4.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent |
Maximum contribution amount per participant | 1,000 hlit_DefinedContributionPlanEmployerDiscretionaryMaximumContributionAmountPerParticipant |
Contributions in period | $ 161,000 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount | $ 173,000 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Defined contribution plan description | The Company has a retirement/savings plan which qualifies as a thrift plan under Section 401(k) of the Internal Revenue Code. This plan allows participants to contribute up to the applicable Internal Revenue Code limitations under the plan. The Company has made discretionary contributions to the plan of 25% of the first 4% contributed by eligible participants, up to a maximum contribution per participant of $1,000 per year. |
Employee Stock Purchase Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Percentage of fair market value of Common Stock to purchase shares | 85.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent / us-gaap_AwardTypeAxis = hlit_EmployeeStockPurchasePlanMember |
Minimum [Member] | Employee Stock Purchase Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Employee Stock Purchase Plan Payroll Deductions | 1.00%hlit_EmployeeStockPurchasePlanPayrollDeductions / us-gaap_AwardTypeAxis = hlit_EmployeeStockPurchasePlanMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Maximum [Member] | Employee Stock Purchase Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Employee Stock Purchase Plan Payroll Deductions | 10.00%hlit_EmployeeStockPurchasePlanPayrollDeductions / us-gaap_AwardTypeAxis = hlit_EmployeeStockPurchasePlanMember / us-gaap_RangeAxis = us-gaap_MaximumMember |

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- Definition Defined Contribution Plan Employer Discretionary Maximum Contribution Amount Per Participant + References No definition available. + Details
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- Definition Employee Stock Purchase Plan Payroll Deductions + References No definition available. + Details
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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- Definition Description of the terms and benefits provided by the employer's defined contribution plans. A defined contribution plan provides benefits in return for services rendered, provides an individual account for each participant, and has terms that specify how contributions to the individual's account are to be determined rather than the amount of benefits the individual is to receive. Under a defined contribution pension plan, the benefits a participant will receive depend solely on the amount contributed to the participant's account, the returns earned on investments of those contributions, and forfeitures of other participants' benefits that may be allocated to such participant's account. A description of the plan(s) including employee groups covered, the basis for determining contributions, and the nature and effects of significant matters affecting comparability of information for all periods presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Defined Contribution Postretirement Plan -URI http://asc.fasb.org/extlink&oid=6510416 + Details
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- Details
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- Definition Number of additional shares authorized for issuance under an established share-based compensation plan. + References No definition available. + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Purchase price of common stock expressed as a percentage of its fair value. + References No definition available. + Details
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