Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments and Hedging Activities - Additional Information (Details)

v2.4.1.9
Derivative Instruments and Hedging Activities - Additional Information (Details) (USD $)
9 Months Ended 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2015
Jun. 30, 2014
Nov. 30, 2014
Oct. 31, 2014
Derivative [Line Items]
Unrealized gains recognized within accumulated other comprehensive income 4,412,000us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax $ 4,412,000us-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 | Non-Designated 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, gain on derivative 1,200,000us-gaap_DerivativeGainOnDerivative
/ 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 | Non-Designated 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
Cash Flow Hedging | Derivatives Designated as Hedging Instruments | Senior Notes | Treasury Lock | Portion of senior notes | Non-Designated Forward Contracts | Interest Expense
Derivative [Line Items]
Recognition of gain amortized in accumulated other comprehensive income (loss) 300,000us-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		 $ 200,000us-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%.
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