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Marketable Securities - Additional Information (Details) (USD $)
In Thousands, unless otherwise specified |
Mar. 31, 2015
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Jun. 30, 2014
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| 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 |
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| Gross Unrealized Gains |
690klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember |
287klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember |
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| Gross Unrealized Losses |
(25)klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember |
(52)klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember |
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| Fair Value |
331,740klac_AvailableForSaleSecuritiesAndCashEquivalentsFairValueDisclosure / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember |
384,400klac_AvailableForSaleSecuritiesAndCashEquivalentsFairValueDisclosure / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember |
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| U.S. Government agency securities | ||||||
| Marketable Securities | ||||||
| Amortized Cost |
672,200klac_AvailableForSaleSecuritiesAndCashEquivalentsAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember |
867,309klac_AvailableForSaleSecuritiesAndCashEquivalentsAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember |
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| Gross Unrealized Gains |
789klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember |
651klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember |
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| Gross Unrealized Losses |
(53)klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember |
(117)klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember |
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| Fair Value |
672,936klac_AvailableForSaleSecuritiesAndCashEquivalentsFairValueDisclosure / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember |
867,843klac_AvailableForSaleSecuritiesAndCashEquivalentsFairValueDisclosure / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember |
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| Municipal securities | ||||||
| Marketable Securities | ||||||
| Amortized Cost |
33,089klac_AvailableForSaleSecuritiesAndCashEquivalentsAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember |
96,198klac_AvailableForSaleSecuritiesAndCashEquivalentsAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember |
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| Gross Unrealized Gains |
6klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember |
93klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember |
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| Gross Unrealized Losses |
(36)klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember |
(75)klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember |
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| Fair Value |
33,059klac_AvailableForSaleSecuritiesAndCashEquivalentsFairValueDisclosure / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember |
96,216klac_AvailableForSaleSecuritiesAndCashEquivalentsFairValueDisclosure / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember |
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| 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 |
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| Gross Unrealized Gains |
1,173klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember |
3,526klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember |
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| Gross Unrealized Losses |
(194)klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember |
(152)klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember |
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| Fair Value |
663,142klac_AvailableForSaleSecuritiesAndCashEquivalentsFairValueDisclosure / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember |
1,224,168klac_AvailableForSaleSecuritiesAndCashEquivalentsFairValueDisclosure / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember |
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| Money market and other | ||||||
| Marketable Securities | ||||||
| Amortized Cost |
406,337klac_AvailableForSaleSecuritiesAndCashEquivalentsAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = klac_MoneyMarketBankDepositsAndOtherMember |
397,517klac_AvailableForSaleSecuritiesAndCashEquivalentsAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = klac_MoneyMarketBankDepositsAndOtherMember |
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| Gross Unrealized Gains |
0klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = klac_MoneyMarketBankDepositsAndOtherMember |
0klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = klac_MoneyMarketBankDepositsAndOtherMember |
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| Gross Unrealized Losses |
0klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = klac_MoneyMarketBankDepositsAndOtherMember |
0klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = klac_MoneyMarketBankDepositsAndOtherMember |
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| Fair Value |
406,337klac_AvailableForSaleSecuritiesAndCashEquivalentsFairValueDisclosure / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = klac_MoneyMarketBankDepositsAndOtherMember |
397,517klac_AvailableForSaleSecuritiesAndCashEquivalentsFairValueDisclosure / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = klac_MoneyMarketBankDepositsAndOtherMember |
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| Sovereign securities | ||||||
| Marketable Securities | ||||||
| Amortized Cost |
49,321klac_AvailableForSaleSecuritiesAndCashEquivalentsAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_SovereignDebtSecuritiesMember |
42,227klac_AvailableForSaleSecuritiesAndCashEquivalentsAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_SovereignDebtSecuritiesMember |
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| Gross Unrealized Gains |
32klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_SovereignDebtSecuritiesMember |
46klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_SovereignDebtSecuritiesMember |
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| Gross Unrealized Losses |
(8)klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_SovereignDebtSecuritiesMember |
(9)klac_AvailableForSaleSecuritiesCashEquivalentsGrossUnrealizedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_SovereignDebtSecuritiesMember |
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| Fair Value |
$ 49,345klac_AvailableForSaleSecuritiesAndCashEquivalentsFairValueDisclosure / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_SovereignDebtSecuritiesMember |
$ 42,264klac_AvailableForSaleSecuritiesAndCashEquivalentsFairValueDisclosure / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_SovereignDebtSecuritiesMember |
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- Definition
Available For Sale Securities Amortized Cost and Cash Equivalents. No definition available.
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Available For Sale Securities and Cash Equivalents Fair Value Disclosure No definition available.
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Available-for-sale Securities & Cash Equivalents Gross Unrealized Gains No definition available.
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- Definition
Available For Sale Securities & Cash Equivalents Gross Unrealized Loss No definition available.
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Cash Equivalent Gross Unrealized Loss No definition available.
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Cash Equivalents Gross Unrealized Gains No definition available.
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Cash Equivalents Net Of Unrealized Gains And Losses No definition available.
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- Definition
Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
For banks and other depository institutions (including Federal Reserve Banks, if applicable): Interest-bearing deposits in other financial institutions for relatively short periods of time including, for example, certificates of deposits, which are presented separately from cash on the balance sheet. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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