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Derivative and Hedgiing Activities Derivatives and Hedging Activities Asset and Liability Offset (Details) (USD $)
In Thousands, unless otherwise specified
Apr. 03, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Derivative Asset, Fair Value, Gross Asset $ 148us-gaap_DerivativeFairValueOfDerivativeAsset
Derivative Asset, Not Offset, Policy Election Deduction 0us-gaap_DerivativeAssetNotOffsetPolicyElectionDeduction
Derivative Asset Fair Value Net Amount After Not Offset Policy Election Deduction 148hlit_DerivativeAssetFairValueNetAmountAfterNotOffsetPolicyElectionDeduction
Derivative Asset, Collateral, Obligation to Return Cash, Offset (18)us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset
Derivative Asset, Fair Value of Collateral 0us-gaap_DerivativeAssetFairValueOfCollateral
Derivative Asset, Fair Value, Amount Offset Against Collateral 130us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral
Derivative Liability, Fair Value, Gross Liability 18us-gaap_DerivativeFairValueOfDerivativeLiability
Derivative Liability, Not Offset, Policy Election Deduction 0us-gaap_DerivativeLiabilityNotOffsetPolicyElectionDeduction
Derivative Liability Fair Value Net Amount After Not Offset Policy Election 18hlit_DerivativeLiabilityFairValueNetAmountAfterNotOffsetPolicyElection
Derivative Liability, Collateral, Right to Reclaim Cash, Offset (18)us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset
Derivative Liability, Fair Value of Collateral 0us-gaap_DerivativeLiabilityFairValueOfCollateral
Derivative Liability, Fair Value, Amount Offset Against Collateral $ 0us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral