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DERIVATIVES FINANCIAL INSTRUMENTS (Fair value of derivative instruments) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 27, 2014
Sep. 27, 2014
Derivatives, Fair Value [Line Items]    
Total derivative, Notional Amount $ 9,537invest_DerivativeNotionalAmount  
Recognition of hedging effectiveness period 12 months  
Prepaid Expenses and Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Total derivative, Fair Value Asset Derivatives 0us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember
 
Accrued Expenses and Other Current Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Total derivative, Fair Value Liability Derivatives 392us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= klic_AccruedExpensesAndOtherCurrentLiabilitiesMember
 
Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member]    
Derivatives, Fair Value [Line Items]    
Foreign exchange forward contract, term of contract   6 months
Total derivative, Notional Amount 9,537invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
 
Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Prepaid Expenses and Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Total derivative, Fair Value Asset Derivatives 0us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
 
Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Accrued Expenses and Other Current Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Total derivative, Fair Value Liability Derivatives $ 392us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= klic_AccruedExpensesAndOtherCurrentLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember