Quarterly report pursuant to Section 13 or 15(d)

Marketable Securities (Details)

v2.4.1.9
Marketable Securities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Jun. 30, 2014
Marketable Securities
Amortized Cost $ 2,234,046klac_AvailableForSaleSecuritiesAndCashEquivalentsAmortizedCost $ 3,008,210klac_AvailableForSaleSecuritiesAndCashEquivalentsAmortizedCost
Gross Unrealized Gains 808klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedGains 4,603klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedGains
Gross Unrealized Losses (1,649)klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedLoss (405)klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedLoss
Fair Value 2,233,205klac_AvailableForSaleSecuritiesAndCashEquivalentsFairValueDisclosure 3,012,408klac_AvailableForSaleSecuritiesAndCashEquivalentsFairValueDisclosure
Add: Time deposits 21,891我们,gaap_InterestBearingDepositsInBanks [1] 33,509我们,gaap_InterestBearingDepositsInBanks [1]
Less: Cash Equivalents, Amortized Cost 473,132我们,gaap_CashEquivalentsAtCarryingValue 524,149我们,gaap_CashEquivalentsAtCarryingValue
Cash Equivalents, Gross Unrealized Gains 0klac_CashEquivalentsGrossUnrealizedGains 0klac_CashEquivalentsGrossUnrealizedGains
Cash Equivalents, Gross Unrealized Losses (4)klac_CashEquivalentGrossUnrealizedLoss (8)klac_CashEquivalentGrossUnrealizedLoss
Less: Cash Equivalents, Fair Value 473,128klac_CashEquivalentsNetOfUnrealizedGainsAndLosses 524,141klac_CashEquivalentsNetOfUnrealizedGainsAndLosses
Marketable Securities, Amortized Cost 1,782,805我们,gaap_AvailableForSaleSecuritiesAmortizedCost 2,517,570我们,gaap_AvailableForSaleSecuritiesAmortizedCost
Marketable Securities, Gross Unrealized Gains 808我们,gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax 4,603我们,gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
有价证券,总未实现损失 (1,645)我们,gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax (397)我们,gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Marketable Securities, Fair Value 1,781,968我们,gaap_AvailableForSaleSecurities 2,521,776我们,gaap_AvailableForSaleSecurities
U.S. Treasury securities
Marketable Securities
Amortized Cost 314,760klac_AvailableForSaleSecuritiesAndCashEquivalentsAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember		 384,165klac_AvailableForSaleSecuritiesAndCashEquivalentsAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember
Gross Unrealized Gains 106klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember		 287klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember
Gross Unrealized Losses (144)klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember		 (52)klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember
Fair Value 314,722klac_AvailableForSaleSecuritiesAndCashEquivalentsFairValueDisclosure
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember		 384,400klac_AvailableForSaleSecuritiesAndCashEquivalentsFairValueDisclosure
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember
U.S. Government agency securities
Marketable Securities
Amortized Cost 694,683klac_AvailableForSaleSecuritiesAndCashEquivalentsAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		 867,309klac_AvailableForSaleSecuritiesAndCashEquivalentsAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Gross Unrealized Gains 219klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		 651klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Gross Unrealized Losses (553)klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		 (117)klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Fair Value 694,349klac_AvailableForSaleSecuritiesAndCashEquivalentsFairValueDisclosure
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		 867,843klac_AvailableForSaleSecuritiesAndCashEquivalentsFairValueDisclosure
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Municipal securities
Marketable Securities
Amortized Cost 33,057klac_AvailableForSaleSecuritiesAndCashEquivalentsAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember		 96,198klac_AvailableForSaleSecuritiesAndCashEquivalentsAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember
Gross Unrealized Gains 8klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember		 93klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember
Gross Unrealized Losses (33)klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember		 (75)klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember
Fair Value 33,032klac_AvailableForSaleSecuritiesAndCashEquivalentsFairValueDisclosure
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember		 96,216klac_AvailableForSaleSecuritiesAndCashEquivalentsFairValueDisclosure
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember
Corporate debt securities
Marketable Securities
Amortized Cost 725,124klac_AvailableForSaleSecuritiesAndCashEquivalentsAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember		 1,220,794klac_AvailableForSaleSecuritiesAndCashEquivalentsAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Gross Unrealized Gains 453klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember		 3,526klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Gross Unrealized Losses (888)klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember		 (152)klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Fair Value 724,689klac_AvailableForSaleSecuritiesAndCashEquivalentsFairValueDisclosure
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember		 1,224,168klac_AvailableForSaleSecuritiesAndCashEquivalentsFairValueDisclosure
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Money market and other
Marketable Securities
Amortized Cost 414,875klac_AvailableForSaleSecuritiesAndCashEquivalentsAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= klac_MoneyMarketBankDepositsAndOtherMember		 397,517klac_AvailableForSaleSecuritiesAndCashEquivalentsAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= klac_MoneyMarketBankDepositsAndOtherMember
Gross Unrealized Gains 0klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= klac_MoneyMarketBankDepositsAndOtherMember		 0klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= klac_MoneyMarketBankDepositsAndOtherMember
Gross Unrealized Losses 0klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= klac_MoneyMarketBankDepositsAndOtherMember		 0klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= klac_MoneyMarketBankDepositsAndOtherMember
Fair Value 414,875klac_AvailableForSaleSecuritiesAndCashEquivalentsFairValueDisclosure
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= klac_MoneyMarketBankDepositsAndOtherMember		 397,517klac_AvailableForSaleSecuritiesAndCashEquivalentsFairValueDisclosure
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= klac_MoneyMarketBankDepositsAndOtherMember
Sovereign securities
Marketable Securities
Amortized Cost 51,547klac_AvailableForSaleSecuritiesAndCashEquivalentsAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_SovereignDebtSecuritiesMember		 42,227klac_AvailableForSaleSecuritiesAndCashEquivalentsAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_SovereignDebtSecuritiesMember
Gross Unrealized Gains 22klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_SovereignDebtSecuritiesMember		 46klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_SovereignDebtSecuritiesMember
Gross Unrealized Losses (31)klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_SovereignDebtSecuritiesMember		 (9)klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_SovereignDebtSecuritiesMember
Fair Value $ 51,538klac_AvailableForSaleSecuritiesAndCashEquivalentsFairValueDisclosure
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_SovereignDebtSecuritiesMember		 $ 42,264klac_AvailableForSaleSecuritiesAndCashEquivalentsFairValueDisclosure
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_SovereignDebtSecuritiesMember
[1] Time deposits excluded from fair value measurements.
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