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Debt (Debt Issuances - Senior Notes) (Details) (USD $)
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3 Months Ended |
6 Months Ended |
0 Months Ended |
1 Months Ended |
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2014
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Dec. 31, 2013
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Nov. 19, 2014
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Nov. 30, 2014
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Jun. 30, 2014
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Oct. 31, 2014
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| Debt Instrument [Line Items] |
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| Cash dividends declared per share (in dollars per share) |
$ 17us-gaap_CommonStockDividendsPerShareDeclared
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$ 0.45us-gaap_CommonStockDividendsPerShareDeclared
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$ 17.5us-gaap_CommonStockDividendsPerShareDeclared
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$ 0.9us-gaap_CommonStockDividendsPerShareDeclared
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| Discount on debt |
$ 3,929,000us-gaap_DebtInstrumentUnamortizedDiscount
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$ 3,929,000us-gaap_DebtInstrumentUnamortizedDiscount
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$ 2,081,000us-gaap_DebtInstrumentUnamortizedDiscount
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| Special Cash Dividend |
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| Debt Instrument [Line Items] |
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| Cash dividends declared per share (in dollars per share) |
$ 16.50us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_DividendsAxis
= klac_SpecialCashDividendMember
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$ 0us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_DividendsAxis
= klac_SpecialCashDividendMember
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$ 0us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_DividendsAxis
= klac_SpecialCashDividendMember
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$ 16.50us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_DividendsAxis
= klac_SpecialCashDividendMember
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$ 16.50us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_DividendsAxis
= klac_SpecialCashDividendMember
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| Cash dividends |
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2,760,000,000us-gaap_DividendsCommonStockCash
/ us-gaap_DividendsAxis
= klac_SpecialCashDividendMember
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| Treasury Lock | Forward Contracts | Senior Notes | Derivatives Designated as Hedging Instruments | Cash Flow Hedging | Portion of senior notes |
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| Debt Instrument [Line Items] |
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| Derivative interest rate |
4.626%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DebtInstrumentAxis
= klac_PortionofSeniorNotesMember
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_TreasuryLockMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_SeniorNotesMember
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4.626%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DebtInstrumentAxis
= klac_PortionofSeniorNotesMember
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_TreasuryLockMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_SeniorNotesMember
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| Notional amount of derivative |
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1,000,000,000invest_DerivativeNotionalAmount
/ us-gaap_DebtInstrumentAxis
= klac_PortionofSeniorNotesMember
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_TreasuryLockMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_SeniorNotesMember
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| Senior Notes |
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| Debt Instrument [Line Items] |
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| Principal amount |
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2,500,000,000.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
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| Discount on debt |
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4,000,000us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
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| Debt frequency of payment |
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semi-annually
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| Offer to repurchase senior notes, percent of principal amount |
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101.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
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| Fair value |
2,600,000,000us-gaap_DebtInstrumentFairValue
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
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2,600,000,000us-gaap_DebtInstrumentFairValue
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
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893,700,000us-gaap_DebtInstrumentFairValue
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
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| Senior Notes | Standard & Poor's, BBplus Rating |
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| Debt Instrument [Line Items] |
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| Decrease in credit rating, interest rate increase |
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0.25%klac_DebtInstrumentDecreaseinCreditRatingInterestRateAdjustment
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsBBPlusRatingMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
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| Senior Notes | Standard & Poor's, BB Rating |
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| Debt Instrument [Line Items] |
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| Decrease in credit rating, interest rate increase |
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0.50%klac_DebtInstrumentDecreaseinCreditRatingInterestRateAdjustment
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsBBRatingMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
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| Senior Notes | Standard & Poor's, BB- Rating |
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| Debt Instrument [Line Items] |
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| Decrease in credit rating, interest rate increase |
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0.75%klac_DebtInstrumentDecreaseinCreditRatingInterestRateAdjustment
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsBBMinusRatingMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
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| Senior Notes | Standard & Poor's, B Plus or Below |
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| Debt Instrument [Line Items] |
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| Decrease in credit rating, interest rate increase |
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1.00%klac_DebtInstrumentDecreaseinCreditRatingInterestRateAdjustment
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsBPlusRatingMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
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| Senior Notes | Moody's, Ba1 Rating |
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| Debt Instrument [Line Items] |
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| Decrease in credit rating, interest rate increase |
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0.25%klac_DebtInstrumentDecreaseinCreditRatingInterestRateAdjustment
/ us-gaap_CreditRatingMoodysAxis
= us-gaap_MoodysBa1RatingMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
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| Senior Notes | Moody's, Ba2 Rating |
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| Debt Instrument [Line Items] |
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| Decrease in credit rating, interest rate increase |
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0.50%klac_DebtInstrumentDecreaseinCreditRatingInterestRateAdjustment
/ us-gaap_CreditRatingMoodysAxis
= us-gaap_MoodysBa2RatingMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
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| Senior Notes | Moody's, Ba3 Rating |
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| Debt Instrument [Line Items] |
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| Decrease in credit rating, interest rate increase |
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0.75%klac_DebtInstrumentDecreaseinCreditRatingInterestRateAdjustment
/ us-gaap_CreditRatingMoodysAxis
= us-gaap_MoodysBa3RatingMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
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| Senior Notes | Moody's, B1 Rating |
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| Debt Instrument [Line Items] |
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| Decrease in credit rating, interest rate increase |
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1.00%klac_DebtInstrumentDecreaseinCreditRatingInterestRateAdjustment
/ us-gaap_CreditRatingMoodysAxis
= us-gaap_MoodysB1RatingMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
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| Senior Notes | 2018 Senior Notes |
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| Debt Instrument [Line Items] |
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| Principal amount |
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$ 750,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= klac_SeniorNotesDueMay12018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
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| Debt maturity date |
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2018
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