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Employee Benefit Plans - Additional Information (Detail) (USD $)	3 Months Ended
	Apr. 03, 2015	Mar. 28, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of options exercised	$ 1,300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	$ 100,000us-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	1,000hlit_DefinedContributionPlanEmployerDiscretionaryMaximumContributionAmountPerParticipant
Contributions in period	$ 161,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount	$ 173,000us-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

X

- Definition

Defined Contribution Plan Employer Discretionary Maximum Contribution Amount Per Participant

+ References

No definition available.

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- Definition

Employee Stock Purchase Plan Payroll Deductions

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- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

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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.

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- Definition

Percentage employer matches of the employee's percentage contribution matched.

+ References

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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

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- Definition

Number of additional shares authorized for issuance under an established share-based compensation plan.

+ References

No definition available.

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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

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- Definition

Purchase price of common stock expressed as a percentage of its fair value.

+ References

No definition available.

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