Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments and Hedging Activities (Additional Disclosures) (Details)

v2.4.1.9
Derivative Instruments and Hedging Activities (Additional Disclosures) (Details) (USD $)
 6 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2014
Jun. 30, 2014
Nov. 30, 2014
Oct. 31, 2014
Derivative [Line Items]          
Unrealized gains recognized within accumulated other comprehensive income 7,756,000us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax $ 7,756,000us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax $ (12,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax    
Senior Notes          
Derivative [Line Items]          
Debt instrument, face amount       2,500,000,000.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember 		 
Fixed-rate 4.650% Senior notes due on November 1, 2024 | Senior Notes          
Derivative [Line Items]          
Debt instrument, face amount         1,250,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= klac_SeniorNotesDueNovember12024Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Stated interest rate 4.65%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= klac_SeniorNotesDueNovember12024Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember 		[1] 4.65%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= klac_SeniorNotesDueNovember12024Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember 		[1]     4.65%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= klac_SeniorNotesDueNovember12024Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
2018 Senior Notes | Senior Notes          
Derivative [Line Items]          
Debt instrument, face amount       750,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= klac_SeniorNotesDueMay12018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember 		 
Stated interest rate 6.90%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= klac_SeniorNotesDueMay12018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember 		6.90%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= klac_SeniorNotesDueMay12018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember 		6.90%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= klac_SeniorNotesDueMay12018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember 		   
Derivatives Designated as Hedging Instruments          
Derivative [Line Items]          
Hedge contracts maximum maturity 13 months        
Not Designated as Hedging Instrument | Senior Notes | Treasury Lock | 2018 Senior Notes | Forward Contracts          
Derivative [Line Items]          
Notional amount of derivative       750,000,000invest_DerivativeNotionalAmount
/ us-gaap_DebtInstrumentAxis
= klac_SeniorNotesDueMay12018Member
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_TreasuryLockMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_SeniorNotesMember 		 
Derivative, loss on derivative   1,200,000us-gaap_DerivativeLossOnDerivative
/ us-gaap_DebtInstrumentAxis
= klac_SeniorNotesDueMay12018Member
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_TreasuryLockMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_SeniorNotesMember 		     
Cash Flow Hedging | Derivatives Designated as Hedging Instruments          
Derivative [Line Items]          
Derivative maximum maturity, cash flow hedges 18 months        
Cash Flow Hedging | Derivatives Designated as Hedging Instruments | Senior Notes | Treasury Lock | Portion of senior notes | Forward Contracts          
Derivative [Line Items]          
Notional amount of derivative         1,000,000,000invest_DerivativeNotionalAmount
/ us-gaap_DebtInstrumentAxis
= klac_PortionofSeniorNotesMember
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_TreasuryLockMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_SeniorNotesMember
Unrealized gains recognized within accumulated other comprehensive income 7,500,000us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
/ us-gaap_DebtInstrumentAxis
= klac_PortionofSeniorNotesMember
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_TreasuryLockMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_SeniorNotesMember 		7,500,000us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
/ us-gaap_DebtInstrumentAxis
= klac_PortionofSeniorNotesMember
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_TreasuryLockMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_SeniorNotesMember 		     
Cash Flow Hedging | Derivatives Designated as Hedging Instruments | Senior Notes | Treasury Lock | Portion of senior notes | Forward Contracts | Interest Expense          
Derivative [Line Items]          
Recognition of gain amortized in accumulated other comprehensive income (loss) 100,000us-gaap_DerivativeInstrumentsGainReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion
/ us-gaap_DebtInstrumentAxis
= klac_PortionofSeniorNotesMember
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_TreasuryLockMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_SeniorNotesMember 		$ 100,000us-gaap_DerivativeInstrumentsGainReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion
/ us-gaap_DebtInstrumentAxis
= klac_PortionofSeniorNotesMember
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_TreasuryLockMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_SeniorNotesMember 		     
[1] The effective interest rate disclosed above for this series of Senior Notes excludes the impact of the treasury rate lock hedge discussed below. The effective interest rate including the impact of the treasury rate lock hedge was 4.626%.