Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Details)

v2.4.1.9
Income Taxes (Details) (USD $)
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Jun. 30, 2015
Jun. 30, 2015
Operating Loss Carryforwards
Income (loss) before income taxes $ (6,268,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ 176,745,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ 92,739,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ 316,609,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Provision for (benefit from) income taxes (26,536,000)us-gaap_IncomeTaxExpenseBenefit 37,499,000us-gaap_IncomeTaxExpenseBenefit 238,000us-gaap_IncomeTaxExpenseBenefit 66,166,000us-gaap_IncomeTaxExpenseBenefit
Effective tax rate 423.40%us-gaap_EffectiveIncomeTaxRateContinuingOperations 21.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations 0.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations 20.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Pre-tax net loss on extinguishment of debt 131,700,000us-gaap_GainsLossesOnExtinguishmentOfDebt 131,700,000us-gaap_GainsLossesOnExtinguishmentOfDebt
Decrease in tax expense, loss on extinguishment of debt, amount 45,800,000klac_EffectiveIncomeTaxRateReconciliationDeductionGainLossOnExtinguishmentOfDebtAmount
Decrease in tax expense, reinstatement of the U.S. federal research credit 10,400,000us-gaap_IncomeTaxReconciliationTaxCreditsResearch
Decrease in tax expense as compared to prior year period, loss on extinguishment of debt, amount 45,800,000klac_IncomeTaxRateComparisonDeductionGainLossOnExtinguishmentOfDebtAmount 45,800,000klac_IncomeTaxRateComparisonDeductionGainLossOnExtinguishmentOfDebtAmount
Decrease in tax expense as compared to prior year period, reinstatement of the U.S. federal research credit 8300000年klac_IncomeTaxRateComparisonTaxCreditResearchAmount 3,500,000klac_IncomeTaxRateComparisonTaxCreditResearchAmount
Decrease in tax expense as compared to prior year period, non-taxable increase in fair value of assets held within Executive Deferred Savings Plan 4,500,000klac_IncomeTaxRateComparisonTaxExemptChangeInFairValueOfAssetsOfDeferredSavingsPlan
Unrecognized tax benefits, reduction in next twelve months resulting from lapse of applicable statute of limitations $ 11,600,000us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Forecast
Operating Loss Carryforwards
Estimated effective tax rate 22.00%klac_EstimatedEffectiveTaxRate
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember		 19.00%klac_EstimatedEffectiveTaxRate
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
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