Quarterly report pursuant to Section 13 or 15(d)

Equity and Long-Term Incentive Compensation Plans (Cash Long-Term Incentive Plan) (Details)

v2.4.1.9
Equity and Long-Term Incentive Compensation Plans (Cash Long-Term Incentive Plan) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
vesting_installment
Dec. 31, 2013
Cash Long-Term Incentive Plan        
Cash-based long-term incentive plan, approved amount $ 65.7klac_LongTermIncentivePlanApprovedAmount   $ 65.7klac_LongTermIncentivePlanApprovedAmount  
Cash Long-Term Incentive Plan        
Cash Long-Term Incentive Plan        
Cash long-term incentive plan, number of equal vesting installments     4klac_DeferredCompensationArrangementWithIndividualNumberOfEqualVestingInstallments
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= klac_CashLongTermIncentivePlanMember 		 
Cash long-term incentive plan, percentage of equal vesting installments     25.00%klac_DeferredCompensationArrangementWithIndividualPercentageOfEqualVestingInstallments
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= klac_CashLongTermIncentivePlanMember 		 
Cash long-term incentive plan, vesting period     4 years  
Cash long-term incentive program, compensation expense 10.7us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= klac_CashLongTermIncentivePlanMember 		7.3us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= klac_CashLongTermIncentivePlanMember 		18.5us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= klac_CashLongTermIncentivePlanMember 		11.4us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= klac_CashLongTermIncentivePlanMember
Cash long-term incentive plan, unrecognized compensation balance $ 125.8klac_DeferredCompensationArrangementWithIndividualUnrecognizedCompensationLiability
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= klac_CashLongTermIncentivePlanMember 		  $ 125.8klac_DeferredCompensationArrangementWithIndividualUnrecognizedCompensationLiability
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= klac_CashLongTermIncentivePlanMember