Quarterly report pursuant to Section 13 or 15(d)

Marketable Securities - Additional Information (Details)

v2.4.1.9
Marketable Securities - Additional Information (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Jun. 30, 2014
Marketable Securities
Amortized Cost $ 2,154,185klac_AvailableForSaleSecuritiesAndCashEquivalentsAmortizedCost $ 3,008,210klac_AvailableForSaleSecuritiesAndCashEquivalentsAmortizedCost
Gross Unrealized Gains 2,690klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedGains 4,603klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedGains
Gross Unrealized Losses (316)klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedLoss (405)klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedLoss
Fair Value 2,156,559klac_AvailableForSaleSecuritiesAndCashEquivalentsFairValueDisclosure 3,012,408klac_AvailableForSaleSecuritiesAndCashEquivalentsFairValueDisclosure
Add: Time deposits 24,663us-gaap_InterestBearingDepositsInBanks [1] 33,509us-gaap_InterestBearingDepositsInBanks [1]
Less: Cash Equivalents, Amortized Cost 463,330us-gaap_CashEquivalentsAtCarryingValue 524,149us-gaap_CashEquivalentsAtCarryingValue
Cash Equivalents, Gross Unrealized Gains 1klac_CashEquivalentsGrossUnrealizedGains 0klac_CashEquivalentsGrossUnrealizedGains
Cash Equivalents, Gross Unrealized Losses (2)klac_CashEquivalentGrossUnrealizedLoss (8)klac_CashEquivalentGrossUnrealizedLoss
Less: Cash Equivalents, Fair Value 463,329klac_CashEquivalentsNetOfUnrealizedGainsAndLosses 524,141klac_CashEquivalentsNetOfUnrealizedGainsAndLosses
Marketable Securities, Amortized Cost 1,715,518us-gaap_AvailableForSaleSecuritiesAmortizedCost 2,517,570us-gaap_AvailableForSaleSecuritiesAmortizedCost
Marketable Securities, Gross Unrealized Gains 2,689us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax 4,603us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Marketable Securities, Gross Unrealized Losses (314)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax (397)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Marketable Securities, Fair Value 1,717,893us-gaap_AvailableForSaleSecurities 2,521,776us-gaap_AvailableForSaleSecurities
U.S. Treasury securities
Marketable Securities
Amortized Cost 331,075klac_AvailableForSaleSecuritiesAndCashEquivalentsAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember		 384,165klac_AvailableForSaleSecuritiesAndCashEquivalentsAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember
Gross Unrealized Gains 690klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember		 287klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember
Gross Unrealized Losses (25)klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember		 (52)klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember
Fair Value 331,740klac_AvailableForSaleSecuritiesAndCashEquivalentsFairValueDisclosure
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember		 384,400klac_AvailableForSaleSecuritiesAndCashEquivalentsFairValueDisclosure
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember
美国政府机构证券
Marketable Securities
Amortized Cost 672,200klac_AvailableForSaleSecuritiesAndCashEquivalentsAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		 867,309klac_AvailableForSaleSecuritiesAndCashEquivalentsAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Gross Unrealized Gains 789klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		 651klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Gross Unrealized Losses (53)klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		 (117)klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Fair Value 672,936klac_AvailableForSaleSecuritiesAndCashEquivalentsFairValueDisclosure
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		 867,843klac_AvailableForSaleSecuritiesAndCashEquivalentsFairValueDisclosure
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Municipal securities
Marketable Securities
Amortized Cost 33,089klac_AvailableForSaleSecuritiesAndCashEquivalentsAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember		 96,198klac_AvailableForSaleSecuritiesAndCashEquivalentsAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember
Gross Unrealized Gains 6klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember		 93klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember
Gross Unrealized Losses (36)klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember		 (75)klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember
Fair Value 33,059klac_AvailableForSaleSecuritiesAndCashEquivalentsFairValueDisclosure
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember		 96,216klac_AvailableForSaleSecuritiesAndCashEquivalentsFairValueDisclosure
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember
Corporate debt securities
Marketable Securities
Amortized Cost 662,163klac_AvailableForSaleSecuritiesAndCashEquivalentsAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember		 1,220,794klac_AvailableForSaleSecuritiesAndCashEquivalentsAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Gross Unrealized Gains 1,173klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember		 3,526klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Gross Unrealized Losses (194)klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember		 (152)klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Fair Value 663,142klac_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 406,337klac_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 406,337klac_AvailableForSaleSecuritiesAndCashEquivalentsFairValueDisclosure
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= klac_MoneyMarketBankDepositsAndOtherMember		 397,517klac_AvailableForSaleSecuritiesAndCashEquivalentsFairValueDisclosure
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= klac_MoneyMarketBankDepositsAndOtherMember
Sovereign securities
Marketable Securities
Amortized Cost 49,321klac_AvailableForSaleSecuritiesAndCashEquivalentsAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_SovereignDebtSecuritiesMember		 42,227klac_AvailableForSaleSecuritiesAndCashEquivalentsAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_SovereignDebtSecuritiesMember
Gross Unrealized Gains 32klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_SovereignDebtSecuritiesMember		 46klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_SovereignDebtSecuritiesMember
Gross Unrealized Losses (8)klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_SovereignDebtSecuritiesMember		 (9)klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_SovereignDebtSecuritiesMember
Fair Value $ 49,345klac_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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