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SHAREHOLDERS' EQUITY AND EMPLOYEE BENEFIT PLANS (Accumulated other comprehensive income) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 27, 2014
Sep. 27, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Gain from foreign currency translation adjustments $ 2,520us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax $ 3,199us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax
Unrecognized actuarial loss Switzerland pension plan, net of tax (609)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax (609)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax
Switzerland pension plan curtailment (346)klic_AccumulatedOtherComprehensiveIncomeLossCurtailmentOfPensionAndOtherPostretirementBenefitPlansNetOfTax (346)klic_AccumulatedOtherComprehensiveIncomeLossCurtailmentOfPensionAndOtherPostretirementBenefitPlansNetOfTax
Unrealized loss on hedging (392)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax 0us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
Accumulated other comprehensive income $ 1,173us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ 2,244us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax