Quarterly report pursuant to Section 13 or 15(d)

Equity and Long-Term Incentive Compensation Plans (Restricted Stock Unit Activities) (Details)

v2.4.1.9
Equity and Long-Term Incentive Compensation Plans (Restricted Stock Unit Activities) (Details) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended 60 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Jun. 30, 2012
Installment
Restricted Stock Units Activity, Weighted Average Grant Date Fair Value Rollforward          
Restricted stock units granted, weighted-average grant date fair value $ 81.28us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 62.85us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 74.56us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 53.27us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue  
Tax benefits realized by the Company in connection with vested and released restricted stock units $ 1,018,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense $ 1,485,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense $ 24,319,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense $ 42,091,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense  
Restricted Stock Units          
Restricted Stock Units Activity, Weighted Average Grant Date Fair Value Rollforward          
Number of equal vesting installments         2klac_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEqualVestingInstallments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_RestrictedStockUnitsRSUMember
Restricted Stock Units | Second anniversary          
Restricted Stock Units Activity, Weighted Average Grant Date Fair Value Rollforward          
Percentage of equal vesting installments         50.00%klac_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfEqualVestingInstallments
/ klac_InstallmentAnniversaryAxis
= klac_SecondAnniversaryMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_RestrictedStockUnitsRSUMember
Restricted Stock Units | Fourth anniversary          
Restricted Stock Units Activity, Weighted Average Grant Date Fair Value Rollforward          
Percentage of equal vesting installments         50.00%klac_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfEqualVestingInstallments
/ klac_InstallmentAnniversaryAxis
= klac_FourthAnniversaryMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_RestrictedStockUnitsRSUMember
Restricted Stock Unit, Service-Based          
Restricted Stock Units Activity, Weighted Average Grant Date Fair Value Rollforward          
Number of equal vesting installments     4klac_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEqualVestingInstallments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= klac_RestrictedStockUnitServiceBasedMember 		   
Restricted Stock Unit, Service-Based | First anniversary          
Restricted Stock Units Activity, Weighted Average Grant Date Fair Value Rollforward          
Percentage of equal vesting installments     25.00%klac_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfEqualVestingInstallments
/ klac_InstallmentAnniversaryAxis
= klac_FirstAnniversaryMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= klac_RestrictedStockUnitServiceBasedMember 		   
Restricted Stock Unit, Service-Based | Second anniversary          
Restricted Stock Units Activity, Weighted Average Grant Date Fair Value Rollforward          
Percentage of equal vesting installments     25.00%klac_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfEqualVestingInstallments
/ klac_InstallmentAnniversaryAxis
= klac_SecondAnniversaryMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= klac_RestrictedStockUnitServiceBasedMember 		   
Restricted Stock Unit, Service-Based | Third anniversary          
Restricted Stock Units Activity, Weighted Average Grant Date Fair Value Rollforward          
Percentage of equal vesting installments     25.00%klac_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfEqualVestingInstallments
/ klac_InstallmentAnniversaryAxis
= klac_ThirdAnniversaryMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= klac_RestrictedStockUnitServiceBasedMember 		   
Restricted Stock Unit, Service-Based | Fourth anniversary          
Restricted Stock Units Activity, Weighted Average Grant Date Fair Value Rollforward          
Percentage of equal vesting installments     25.00%klac_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfEqualVestingInstallments
/ klac_InstallmentAnniversaryAxis
= klac_FourthAnniversaryMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= klac_RestrictedStockUnitServiceBasedMember 		   
Restricted Stock Unit, Performance-Based And Service-Based          
Restricted Stock Units Activity, Weighted Average Grant Date Fair Value Rollforward          
Number of equal vesting installments     2klac_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEqualVestingInstallments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= klac_RestrictedStockUnitPerformanceBasedAndServiceBasedMember 		   
Restricted Stock Unit, Performance-Based And Service-Based | Third anniversary          
Restricted Stock Units Activity, Weighted Average Grant Date Fair Value Rollforward          
Percentage of equal vesting installments     50.00%klac_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfEqualVestingInstallments
/ klac_InstallmentAnniversaryAxis
= klac_ThirdAnniversaryMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= klac_RestrictedStockUnitPerformanceBasedAndServiceBasedMember 		   
Restricted Stock Unit, Performance-Based And Service-Based | Fourth anniversary          
Restricted Stock Units Activity, Weighted Average Grant Date Fair Value Rollforward          
Percentage of equal vesting installments     50.00%klac_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfEqualVestingInstallments
/ klac_InstallmentAnniversaryAxis
= klac_FourthAnniversaryMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= klac_RestrictedStockUnitPerformanceBasedAndServiceBasedMember 		   
Restricted Stock Units          
Restricted Stock Units Activity Rollforward          
Outstanding restricted stock units as of June 30, 2014, shares     3,356us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember 		[1]    
Granted, shares     591us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember 		[1],[2]    
Vested and released, shares     (696)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember 		[1]    
Withheld for taxes, shares     (366)klac_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWithheldForTaxes
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember 		[1]    
Forfeited, shares     (42)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember 		[1]    
Outstanding restricted stock units as of December 31, 2014, shares 2,843us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember 		[1]   2,843us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember 		[1]    
Restricted Stock Units Activity, Weighted Average Grant Date Fair Value Rollforward          
Outstanding restricted stock units as of June 30, 2014, weighted-average grant date fair value     $ 38.95us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember 		   
Restricted stock units granted, weighted-average grant date fair value     $ 74.56us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember 		[2]    
Restricted stock units vested and released, weighted-average grant date fair value     $ 31.84us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember 		   
Restricted stock units withheld for taxes, weighted-average grant date fair value     $ 31.84klac_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentOtherThanOptionsTradedForTaxesPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember 		   
Restricted stock units forfeited, weighted-average grant date fair value     $ 33.16us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember 		   
Outstanding restricted stock units as of December 31, 2014, weighted-average grant date fair value $ 49.10us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember 		  $ 49.10us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember 		   
Unrecognized stock-based compensation balance 93,700,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember 		  93,700,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember 		   
Estimated weighted-average amortization period     1 year 5 months    
Intrinsic Value, Restricted Stock Units $ 199,900,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember 		  $ 199,900,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember 		   
Awards Granted Before November 6, 2013 | 2004 Plan          
Restricted Stock Units Activity, Weighted Average Grant Date Fair Value Rollforward          
2004 Plan shares reserve multiplier 1.8klac_ImpactOnShareReserveMultiplier
/ us-gaap_AwardDateAxis
= klac_AwardsGrantedBeforeNovember62013Member
/ us-gaap_PlanNameAxis
= klac_TwoThousandFourPlanMember 		  1.8klac_ImpactOnShareReserveMultiplier
/ us-gaap_AwardDateAxis
= klac_AwardsGrantedBeforeNovember62013Member
/ us-gaap_PlanNameAxis
= klac_TwoThousandFourPlanMember 		   
Awards Granted After November 6, 2013 | 2004 Plan          
Restricted Stock Units Activity, Weighted Average Grant Date Fair Value Rollforward          
2004 Plan shares reserve multiplier 2.0klac_ImpactOnShareReserveMultiplier
/ us-gaap_AwardDateAxis
= klac_AwardsGrantedAfterNovember62013Member
/ us-gaap_PlanNameAxis
= klac_TwoThousandFourPlanMember 		  2.0klac_ImpactOnShareReserveMultiplier
/ us-gaap_AwardDateAxis
= klac_AwardsGrantedAfterNovember62013Member
/ us-gaap_PlanNameAxis
= klac_TwoThousandFourPlanMember 		   
Senior Management | Restricted Stock Unit, Performance-Based And Service-Based | Restricted Stock Units          
Restricted Stock Units Activity Rollforward          
Granted, shares     300us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= klac_RestrictedStockUnitPerformanceBasedAndServiceBasedMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ManagementMember 		   
[1] Share numbers reflect actual shares subject to awarded restricted stock units. As described above, under the terms of the 2004 Plan, the number of shares subject to each award reflected in this number is multiplied by either 1.8 or 2.0 (depending on the grant date of the award) to calculate the impact of the award on the share reserve under the 2004 Plan.
[2] Includes restricted stock units granted to senior management during the six months ended December 31, 2014 with performance-based vesting criteria (in addition to service-based vesting criteria for any of such restricted stock units that are deemed to have been earned). As of December 31, 2014, it had not yet been determined the extent to which (if at all) the performance-based vesting criteria of such restricted stock units had been satisfied. Therefore, this line item includes all such performance-based restricted stock units, reported at the maximum possible number of shares that may ultimately be issuable under such restricted stock units if all applicable performance-based criteria are achieved at their maximum and all applicable service-based criteria are fully satisfied (i.e., 0.3 million shares during the six months ended December 31, 2014).