Quarterly report pursuant to Section 13 or 15(d)

Debt - Debt Redemption (Details)

v2.4.1.9
Debt - Debt Redemption (Details) (USD $)
3 Months Ended 9 Months Ended
Dec. 31, 2014
Mar. 31, 2015
Nov. 30, 2014
Debt Instrument [Line Items]
Pre-tax net loss on extinguishment of debt $ 131,700,000us-gaap_GainsLossesOnExtinguishmentOfDebt $ 131,700,000us-gaap_GainsLossesOnExtinguishmentOfDebt
高级笔记|2018年高级笔记
Debt Instrument [Line Items]
赎回债务的本金金额 750,000,000us-gaap_DebtInstrumentRepurchasedFaceAmount
/ us-gaap_DebtInstrumentAxis
= klac_SeniorNotesDueMay12018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Pre-tax net loss on extinguishment of debt 131,700,000us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_DebtInstrumentAxis
= klac_SeniorNotesDueMay12018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
未指定为对冲工具|高级笔记|财政锁|远期合同|2018年高级笔记
Debt Instrument [Line Items]
Derivative, gain on derivative 1200,000us-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
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
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