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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 28, 2015	Mar. 29, 2014	Mar. 28, 2015	Mar. 29, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 7,931us-gaap_NetIncomeLoss	$ 9,070us-gaap_NetIncomeLoss	$ 15,773us-gaap_NetIncomeLoss	$ 7,113us-gaap_NetIncomeLoss
Other comprehensive income:
Foreign currency translation adjustment	(567)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	204us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	(1,246)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	314us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent
Unrecognized actuarial gain, Switzerland pension plan, net of tax	0us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	12us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	0us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	12us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent
Foreign currency translation and pension plan, net of tax	(567)klic_ComprehensiveIncomeLossForeignCurrencyTransactionandTranslationandPensionandOtherPostRetirementBenefitsNetofTaxPortionAttributabletoParent	216klic_ComprehensiveIncomeLossForeignCurrencyTransactionandTranslationandPensionandOtherPostRetirementBenefitsNetofTaxPortionAttributabletoParent	(1,246)klic_ComprehensiveIncomeLossForeignCurrencyTransactionandTranslationandPensionandOtherPostRetirementBenefitsNetofTaxPortionAttributabletoParent	326klic_ComprehensiveIncomeLossForeignCurrencyTransactionandTranslationandPensionandOtherPostRetirementBenefitsNetofTaxPortionAttributabletoParent
Derivatives designated as hedging instruments:
Unrealized loss on derivative instruments, net of tax	(133)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	0us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	(773)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	0us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Reclassification adjustment for loss on derivative instruments recognized, net of tax	525us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	773us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
Net decrease from derivatives designated as hedging instruments, net of tax	392us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent	0us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent	0us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent	0us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent
Total other comprehensive income	(175)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	216us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	(1,246)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	326us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive income	$ 7,756us-gaap_ComprehensiveIncomeNetOfTax	$ 9,286us-gaap_ComprehensiveIncomeNetOfTax	$ 14,527us-gaap_ComprehensiveIncomeNetOfTax	$ 7,439us-gaap_ComprehensiveIncomeNetOfTax

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