$KLAC
KLA CORP Stock $klac

$klac Overview Financials Valuation SEC Filings Company Website

2020 Q2 Form 10-K Financial Statement

#000031920120000047 Filed on August 07, 2020

Income Statement

Concept	2020 Q2	2019 Q2	2019 Q1
Revenue	$1.460B	$1.258B	$1.097B
YoY Change	15.98%	17.61%	7.44%
Cost Of Revenue	$621.5M	$593.8M	$486.9M
YoY Change	4.66%	57.21%	32.19%
Gross Profit	$838.0M	$665.7M	$610.4M
YoY Change	25.9%	-3.87%	-6.52%
Gross Profit Margin	57.42%	52.9%	55.62%
Selling, General & Admin	$153.5M	$166.0M	$182.2M
YoY Change	-7.53%	42.37%	60.89%
% of Gross Profit	18.32%	24.94%	29.85%
Research & Development	$217.1M	$206.7M	$184.9M
YoY Change	5.03%	35.99%	20.65%
% of Gross Profit	25.91%	31.05%	30.29%
Depreciation & Amortization	$78.90M	$127.9M	$73.40M
YoY Change	-38.31%	752.67%	350.31%
% of Gross Profit	9.41%	19.21%	12.03%
Operating Expenses	$384.9M	$396.7M	$367.1M
YoY Change	-2.97%	47.69%	37.75%
Operating Profit	$453.1M	$269.0M	$243.3M
YoY Change	68.49%	-36.54%	-37.05%
Interest Expense	-$40.20M	-$39.50M	$31.19M
YoY Change	1.77%	38.6%	10.91%
% of Operating Profit	-8.87%	-14.69%	12.82%
Other Income/Expense, Net	-$7.900M	$2.900M	$9.300M
YoY Change	-372.41%	-74.34%	17.72%
Pretax Income	$405.1M	$231.3M	$221.4M
YoY Change	75.14%	-43.1%	-39.51%
Income Tax	-$5.200M	$13.20M	$28.75M
% Of Pretax Income	-1.28%	5.71%	12.98%
Net Earnings	$411.3M	$217.8M	$192.7M
YoY Change	88.78%	-37.54%	-37.2%
Net Earnings / Revenue	28.18%	17.31%	17.56%
Basic Earnings Per Share	$2.65	$1.36	$1.23
Diluted Earnings Per Share	$2.63	$1.35	$1.23
COMMON SHARES
Basic Shares Outstanding	155.0M shares	161.6M shares	156.3M shares
Diluted Shares Outstanding			157.2M shares

Balance Sheet

Concept	2020 Q2	2019 Q2	2019 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments	$1.980B	$1.739B	$1.897B
YoY Change	13.86%	-39.61%	-34.35%
Cash & Equivalents	$1.234B	$1.016B	$1.092B
Short-Term Investments	$746.1M	$723.4M	$805.1M
Other Short-Term Assets	$324.7M	$323.1M	$270.1M
YoY Change	0.49%	279.38%	105.93%
Inventory	$1.311B	$1.263B	$1.317B
Prepaid Expenses	$74.96M	$88.39M	$76.51M
Receivables	$1.107B	$990.1M	$958.0M
Other Receivables	$56.80M	$51.90M	$34.50M
Total Short-Term Assets	$4.724B	$4.315B	$4.443B
YoY Change	9.47%	-5.14%	-2.16%
LONG-TERM ASSETS
Property, Plant & Equipment	$519.8M	$448.8M	$411.9M
YoY Change	15.83%	56.76%	44.77%
Goodwill	$2.045B	$2.212B	$2.173B
YoY Change	-7.53%	523.59%	520.83%
Intangibles	$1.391B	$1.561B	$1.694B
YoY Change	-10.85%	7972.57%	10919.21%
Long-Term Investments
YoY Change
Other Assets	$363.0M	$266.0M	$260.1M
YoY Change	36.47%	12.66%	21.62%
Total Long-Term Assets	$4.556B	$4.693B	$4.745B
YoY Change	-2.92%	330.74%	348.63%
TOTAL ASSETS
Total Short-Term Assets	$4.724B	$4.315B	$4.443B
Total Long-Term Assets	$4.556B	$4.693B	$4.745B
Total Assets	$9.280B	$9.009B	$9.188B
YoY Change	3.01%	59.76%	64.12%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$264.3M	$202.4M	$206.2M
YoY Change	30.56%	19.52%	21.71%
Accrued Expenses	$715.2M	$663.6M	$671.5M
YoY Change	7.78%	29.08%	27.64%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$0.00	$250.0M	$250.0M
YoY Change	-100.0%
Total Short-Term Liabilities	$1.700B	$1.768B	$1.701B
YoY Change	-3.88%	45.64%	41.69%
LONG-TERM LIABILITIES
Long-Term Debt	$3.470B	$3.173B	$3.173B
YoY Change	9.34%	41.83%	28.87%
Other Long-Term Liabilities	$672.3M	$587.9M	$575.6M
YoY Change	14.35%	19.19%	16.34%
Total Long-Term Liabilities	$4.142B	$3.761B	$3.748B
YoY Change	10.12%	37.74%	26.77%
TOTAL LIABILITIES
Total Short-Term Liabilities	$1.700B	$1.768B	$1.701B
Total Long-Term Liabilities	$4.142B	$3.761B	$3.748B
Total Liabilities	$6.599B	$6.331B	$6.302B
YoY Change	4.24%	57.56%	49.05%
SHAREHOLDERS EQUITY
Retained Earnings	$654.9M	$714.8M	$928.1M
YoY Change	-8.38%	-32.34%	7.57%
Common Stock	$2.090B	$2.017B
YoY Change	3.62%	226.43%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$2.665B	$2.659B	$2.849B
YoY Change
Total Liabilities & Shareholders Equity	$9.280B	$9.009B	$9.188B
YoY Change	3.01%	59.76%	64.12%

Cashflow Statement

Concept	2020 Q2	2019 Q2	2019 Q1
OPERATING ACTIVITIES
Net Income	$411.3M	$217.8M	$192.7M
YoY Change	88.78%	-37.54%	-37.2%
Depreciation, Depletion And Amortization	$78.90M	$127.9M	$73.40M
YoY Change	-38.31%	752.67%	350.31%
Cash From Operating Activities	$452.9M	$325.4M	$163.6M
YoY Change	39.18%	-12.88%	-53.6%
INVESTING ACTIVITIES
Capital Expenditures	-$41.80M	-$55.80M	-$26.00M
YoY Change	-25.09%	144.74%	73.33%
Acquisitions
YoY Change
Other Investing Activities	-$64.00M	$86.30M	-$1.709B
YoY Change	-174.16%	-42.31%	-4278.48%
Cash From Investing Activities	-$105.8M	$30.40M	-$1.735B
YoY Change	-448.03%	-76.03%	-6798.46%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-61.30M	-432.1M	869.2M
YoY Change	-85.81%	26.57%	-529.66%
NET CHANGE
Cash From Operating Activities	452.9M	325.4M	163.6M
Cash From Investing Activities	-105.8M	30.40M	-1.735B
Cash From Financing Activities	-61.30M	-432.1M	869.2M
Net Change In Cash	285.8M	-76.30M	-702.1M
YoY Change	-474.57%	-148.02%	-498.47%
FREE CASH FLOW
Cash From Operating Activities	$452.9M	$325.4M	$163.6M
Capital Expenditures	-$41.80M	-$55.80M	-$26.00M
Free Cash Flow	$494.7M	$381.2M	$189.6M
YoY Change	29.77%	-3.81%	-48.42%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2020	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
CY2020	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2020	dei	Entity Central Index Key EntityCentralIndexKey	0000319201
CY2020	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--06-30
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CY2019Q3	us-gaap	Accounting Standards Update Extensible List AccountingStandardsUpdateExtensibleList	us-gaap:AccountingStandardsUpdate201602Member
CY2020Q2	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	us-gaap:OtherAssetsNoncurrent
CY2020Q2	us-gaap	Operating Lease Liability Current Statement Of Financial Position Extensible List OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	us-gaap:OtherLiabilitiesCurrent
CY2020Q2	us-gaap	Operating Lease Liability Noncurrent Statement Of Financial Position Extensible List OperatingLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	us-gaap:OtherLiabilitiesNoncurrent
CY2020	dei	Document Type DocumentType	10-K
CY2020	dei	Document Annual Report DocumentAnnualReport	true
CY2020	dei	Document Period End Date DocumentPeriodEndDate	2020-06-30
CY2020	dei	Document Transition Report DocumentTransitionReport	false
CY2020	dei	Entity File Number EntityFileNumber	000-09992
CY2020	dei	Entity Registrant Name EntityRegistrantName	KLA CORP
CY2020	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2020	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	04-2564110
CY2020	dei	Entity Address Address Line1 EntityAddressAddressLine1	One Technology Drive,
CY2020	dei	Entity Address City Or Town EntityAddressCityOrTown	Milpitas,
CY2020	dei	Entity Address State Or Province EntityAddressStateOrProvince	CA
CY2020	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	95035
CY2020	dei	City Area Code CityAreaCode	408
CY2020	dei	Local Phone Number LocalPhoneNumber	875-3000
CY2020	dei	Security12b Title Security12bTitle	Common Stock, $0.001 par value per share
CY2020	dei	Trading Symbol TradingSymbol	KLAC
CY2020	dei	Security Exchange Name SecurityExchangeName	NASDAQ
CY2020	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2020	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2020	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2020	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2020	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2020	dei	Entity Small Business EntitySmallBusiness	false
CY2020	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2020	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2020	dei	Entity Shell Company EntityShellCompany	false
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CY2020	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	-26000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	-5190000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	1358000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	-110000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	-117000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	678000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	84000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-5073000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	680000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	-16739000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	-9119000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	-1934000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	2072000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	4018000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	3846000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax	-4286000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax	-2033000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax	-2491000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-14525000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-11104000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-3289000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-2397000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	1824000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-7162000	USD
CY2020	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	6029000	USD
CY2019	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	11664000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-9697000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	297000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	-1294000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	-209000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	433000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	3208000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	-2325000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	5299000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	9750000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-7163000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-6745000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-8251000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-2610000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	-1760000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	-600000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	0	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1210040000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1167366000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	799655000	USD
CY2017Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1326417000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	802265000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-2610000	USD
CY2018	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	32687000	USD
CY2018	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	203169000	USD
CY2018	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.52
CY2018	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	397863000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	62784000	USD
CY2018Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1620511000	USD
CY2019	us-gaap	Tax Cuts And Jobs Act Of2017 Reclassification From Aoci To Retained Earnings Tax Effect TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsTaxEffect	0	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	1175617000	USD
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-600000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-8251000	USD
CY2019	klac	Stock Assumed During Period Value Acquisitions Share Based Payment Arrangement StockAssumedDuringPeriodValueAcquisitionsShareBasedPaymentArrangement	13281000	USD
CY2019	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	1330786000	USD
CY2019	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	27321000	USD
CY2019	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	1103202000	USD
CY2019	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	3.00
CY2019	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	470009000	USD
CY2019	us-gaap	Noncontrolling Interest Increase From Business Combination NoncontrollingInterestIncreaseFromBusinessCombination	19185000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	94194000	USD
CY2019Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2677693000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	1216785000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-6745000	USD
CY2020	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-1760000	USD
CY2020	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	29374000	USD
CY2020	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	821083000	USD
CY2020	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	3.30
CY2020	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	523396000	USD
CY2020	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	1239000	USD
CY2020	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	111381000	USD
CY2020Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2681010000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	1215025000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	1175017000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	802265000	USD
CY2020	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	256649000	USD
CY2019	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2018	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	348049000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	233224000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	62684000	USD
CY2020	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-22538000	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2018	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2020	us-gaap	Foreign Currency Transaction Gain Loss Unrealized ForeignCurrencyTransactionGainLossUnrealized	-13860000	USD
CY2019	us-gaap	Foreign Currency Transaction Gain Loss Unrealized ForeignCurrencyTransactionGainLossUnrealized	-3830000	USD
CY2018	us-gaap	Foreign Currency Transaction Gain Loss Unrealized ForeignCurrencyTransactionGainLossUnrealized	-9886000	USD
CY2020	us-gaap	Other Asset Impairment Charges OtherAssetImpairmentCharges	13341000	USD
CY2019	us-gaap	Other Asset Impairment Charges OtherAssetImpairmentCharges	221000	USD
CY2018	us-gaap	Other Asset Impairment Charges OtherAssetImpairmentCharges	0	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	111381000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	94194000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	62784000	USD
CY2020	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	-93110000	USD
CY2019	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	-27511000	USD
CY2018	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	98760000	USD
CY2020	klac	Increase Decrease In Accounts Receivable Excluding Acquisition Related IncreaseDecreaseInAccountsReceivableExcludingAcquisitionRelated	118362000	USD
CY2019	klac	Increase Decrease In Accounts Receivable Excluding Acquisition Related IncreaseDecreaseInAccountsReceivableExcludingAcquisitionRelated	146151000	USD
CY2018	klac	Increase Decrease In Accounts Receivable Excluding Acquisition Related IncreaseDecreaseInAccountsReceivableExcludingAcquisitionRelated	76033000	USD
CY2020	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	74817000	USD
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	59561000	USD
CY2018	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	179605000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	11147000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	47123000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	41748000	USD
CY2020	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	61144000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-21627000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	21778000	USD
CY2020	klac	Increase Decrease In Contract With Customer Liability System Revenue IncreaseDecreaseInContractWithCustomerLiabilitySystemRevenue	57687000	USD
CY2019	klac	Increase Decrease In Contract With Customer Liability System Revenue IncreaseDecreaseInContractWithCustomerLiabilitySystemRevenue	-15674000	USD
CY2018	klac	Increase Decrease In Contract With Customer Liability System Revenue IncreaseDecreaseInContractWithCustomerLiabilitySystemRevenue	0	USD
CY2020	klac	Increase Decrease In Contract With Customer Liability Service Revenue IncreaseDecreaseInContractWithCustomerLiabilityServiceRevenue	22779000	USD
CY2019	klac	Increase Decrease In Contract With Customer Liability Service Revenue IncreaseDecreaseInContractWithCustomerLiabilityServiceRevenue	15064000	USD
CY2018	klac	Increase Decrease In Contract With Customer Liability Service Revenue IncreaseDecreaseInContractWithCustomerLiabilityServiceRevenue	0	USD
CY2020	klac	Increase Decrease In Deferred System Profit IncreaseDecreaseInDeferredSystemProfit	0	USD
CY2019	klac	Increase Decrease In Deferred System Profit IncreaseDecreaseInDeferredSystemProfit	0	USD
CY2018	klac	Increase Decrease In Deferred System Profit IncreaseDecreaseInDeferredSystemProfit	99457000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-24649000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-51271000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	368892000	USD
CY2020	us-gaap	Increase Decrease In Derivative Assets And Liabilities IncreaseDecreaseInDerivativeAssetsAndLiabilities	21518000	USD
CY2019	us-gaap	Increase Decrease In Derivative Assets And Liabilities IncreaseDecreaseInDerivativeAssetsAndLiabilities	0	USD
CY2018	us-gaap	Increase Decrease In Derivative Assets And Liabilities IncreaseDecreaseInDerivativeAssetsAndLiabilities	0	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1778850000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1152632000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1229120000	USD
CY2020	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	0	USD
CY2019	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	630000	USD
CY2018	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	3377000	USD
CY2020	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	90143000	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	1818283000	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	17403000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	152675000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	130498000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	66947000	USD
CY2020	us-gaap	Proceeds From Sale Of Other Investments ProceedsFromSaleOfOtherInvestments	1086000	USD
CY2019	us-gaap	Proceeds From Sale Of Other Investments ProceedsFromSaleOfOtherInvestments	0	USD
CY2018	us-gaap	Proceeds From Sale Of Other Investments ProceedsFromSaleOfOtherInvestments	0	USD
CY2020	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	798493000	USD
CY2019	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	81533000	USD
CY2018	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	466330000	USD
CY2020	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	148969000	USD
CY2019	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	256395000	USD
CY2018	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	233259000	USD
CY2020	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	626943000	USD
CY2019	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	589324000	USD
CY2018	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	608446000	USD
CY2020	us-gaap	Payments To Acquire Trading Securities Heldforinvestment PaymentsToAcquireTradingSecuritiesHeldforinvestment	110241000	USD
CY2019	us-gaap	Payments To Acquire Trading Securities Heldforinvestment PaymentsToAcquireTradingSecuritiesHeldforinvestment	81022000	USD
CY2018	us-gaap	Payments To Acquire Trading Securities Heldforinvestment PaymentsToAcquireTradingSecuritiesHeldforinvestment	77922000	USD
CY2020	us-gaap	Proceeds From Sale Of Trading Securities Heldforinvestment ProceedsFromSaleOfTradingSecuritiesHeldforinvestment	115680000	USD
CY2019	us-gaap	Proceeds From Sale Of Trading Securities Heldforinvestment ProceedsFromSaleOfTradingSecuritiesHeldforinvestment	85265000	USD
CY2018	us-gaap	Proceeds From Sale Of Trading Securities Heldforinvestment ProceedsFromSaleOfTradingSecuritiesHeldforinvestment	81892000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-258874000	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	402065000	USD
CY2020	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	1239000	USD
CY2019	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	0	USD
CY2018	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	0	USD
CY2020	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	75634000	USD
CY2019	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	64828000	USD
CY2018	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	61444000	USD
CY2020	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	46260000	USD
CY2019	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	37517000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1180982000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	291618000	USD
CY2020	us-gaap	Proceeds From Debt Net Of Issuance Costs ProceedsFromDebtNetOfIssuanceCosts	741832000	USD
CY2019	us-gaap	Proceeds From Debt Net Of Issuance Costs ProceedsFromDebtNetOfIssuanceCosts	1183785000	USD
CY2018	us-gaap	Proceeds From Debt Net Of Issuance Costs ProceedsFromDebtNetOfIssuanceCosts	0	USD
CY2020	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	450000000	USD
CY2019	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	900000000	USD
CY2018	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	248693000	USD
CY2020	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	1171033000	USD
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	902474000	USD
CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	946250000	USD
CY2020	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	829084000	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1095202000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	203169000	USD
CY2020	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	522421000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	472263000	USD
CY2018	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	28756000	USD
CY2020	klac	Contingent Consideration Payable And Other Net ContingentConsiderationPayableAndOtherNet	2936000	USD
CY2019	klac	Contingent Consideration Payable And Other Net ContingentConsiderationPayableAndOtherNet	-1162000	USD
CY2018	klac	Contingent Consideration Payable And Other Net ContingentConsiderationPayableAndOtherNet	0	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-1299635000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-360005000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-1270103000	USD
CY2020	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-1926000	USD
CY2019	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-33000	USD
CY2018	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	696000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	218415000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-388388000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	251331000	USD
CY2019Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1015994000	USD
CY2018Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1404382000	USD
CY2017Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1153051000	USD
CY2020Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1234409000	USD
CY2019Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1015994000	USD
CY2018Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1404382000	USD
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	194583000	USD
CY2018	klac	Stock Repurchase Program Unsettled Common Stock Repurchase StockRepurchaseProgramUnsettledCommonStockRepurchase	0	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	180470000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	253128000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	152651000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	107073000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	114238000	USD
CY2020	us-gaap	Stock Issued1 StockIssued1	0	USD
CY2019	us-gaap	Stock Issued1 StockIssued1	1330786000	USD
CY2018	us-gaap	Stock Issued1 StockIssued1	0	USD
CY2020	klac	Noncash Or Part Noncash Acquisition Contingent Consideration Payable NoncashOrPartNoncashAcquisitionContingentConsiderationPayable	5326000	USD
CY2019	klac	Noncash Or Part Noncash Acquisition Contingent Consideration Payable NoncashOrPartNoncashAcquisitionContingentConsiderationPayable	6905000	USD
CY2018	klac	Noncash Or Part Noncash Acquisition Contingent Consideration Payable NoncashOrPartNoncashAcquisitionContingentConsiderationPayable	0	USD
CY2020Q2	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	5978000	USD
CY2019Q2	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	7340000	USD
CY2018Q2	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	9571000	USD
CY2020	klac	Noncash Or Part Noncash Acquisition Holdback Consideration Payable NoncashOrPartNoncashAcquisitionHoldbackConsiderationPayable	0	USD
CY2019	klac	Noncash Or Part Noncash Acquisition Holdback Consideration Payable NoncashOrPartNoncashAcquisitionHoldbackConsiderationPayable	440000	USD
CY2018	klac	Noncash Or Part Noncash Acquisition Holdback Consideration Payable NoncashOrPartNoncashAcquisitionHoldbackConsiderationPayable	0	USD
CY2020	klac	Stock Repurchase Program Unsettled Common Stock Repurchase StockRepurchaseProgramUnsettledCommonStockRepurchase	0	USD
CY2019	klac	Stock Repurchase Program Unsettled Common Stock Repurchase StockRepurchaseProgramUnsettledCommonStockRepurchase	8000000	USD
CY2020	us-gaap	Noncash Or Part Noncash Acquisition Fixed Assets Acquired1 NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1	15843000	USD
CY2019	us-gaap	Noncash Or Part Noncash Acquisition Fixed Assets Acquired1 NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1	6353000	USD
CY2018	us-gaap	Noncash Or Part Noncash Acquisition Fixed Assets Acquired1 NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1	7418000	USD
CY2020	us-gaap	Use Of Estimates UseOfEstimates	<span style="background-color:rgb(255,255,255, 0.0);color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%;">Management Estimates.</span><span style="background-color:rgb(255,255,255, 0.0);color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;"> The preparation of the Consolidated Financial Statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions in applying our accounting policies that affect the reported amounts of assets and liabilities (and related disclosure of contingent assets and liabilities) at the date of the Consolidated Financial Statements and the reported amounts of revenues and expenses during the reporting periods. Actual results could differ from those estimates.</span>
CY2020	us-gaap	Depreciation Depreciation	101400000	USD
CY2019	us-gaap	Depreciation Depreciation	72600000	USD
CY2018	us-gaap	Depreciation Depreciation	53300000	USD
CY2020	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<div style="text-indent:22.5pt;margin-top:9pt;"><span style="background-color:rgb(255,255,255, 0.0);color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%;">Concentration of Credit Risk.</span><span style="background-color:rgb(255,255,255, 0.0);color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;"> Financial instruments that potentially subject us to significant concentrations of credit risk consist primarily of cash equivalents, short-term marketable securities, trade accounts receivable and derivative financial instruments used in hedging activities. We invest in a variety of financial instruments, such as, but not limited to, certificates of deposit, corporate debt and municipal securities, United States Treasury and Government agency securities, and equity securities and, by policy, we limit the amount of credit exposure with any one financial institution or commercial issuer. We have not experienced any material credit losses on our investments.</span></div><div style="text-indent:22.5pt;margin-top:9pt;"><span style="background-color:rgb(255,255,255, 0.0);color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;">A majority of our accounts receivable are derived from sales to large multinational semiconductor manufacturers located throughout the world, with a majority located in Asia. In recent years, our customer base has become increasingly concentrated due to corporate consolidations, acquisitions and business closures, and to the extent that these customers experience liquidity </span></div><div style="margin-top:9pt;"><span style="background-color:rgb(255,255,255, 0.0);color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;">issues in the future, we may be required to incur additional bad debt expense with respect to trade receivables. We perform ongoing credit evaluations of our customers’ financial condition and generally require little to no collateral to secure accounts receivable. We maintain an allowance for potential credit losses based upon expected collectibility risk of all accounts receivable. In addition, we may utilize letters of credit, credit insurance or non-recourse factoring to mitigate credit risk when considered appropriate.</span></div><div style="text-indent:22.5pt;margin-top:9pt;"><span style="background-color:rgb(255,255,255, 0.0);color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;">We are exposed to credit loss in the event of non-performance by counterparties on the foreign exchange contracts that we use in hedging activities and in certain factoring transactions. These counterparties are large international financial institutions, and to date no such counterparty has failed to meet its financial obligations to us under such contracts.</span></div>
CY2020	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<div style="text-indent:22.5pt;margin-top:9pt;"><span style="background-color:rgb(255,255,255, 0.0);color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%;">Concentration of Credit Risk.</span><span style="background-color:rgb(255,255,255, 0.0);color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;"> Financial instruments that potentially subject us to significant concentrations of credit risk consist primarily of cash equivalents, short-term marketable securities, trade accounts receivable and derivative financial instruments used in hedging activities. We invest in a variety of financial instruments, such as, but not limited to, certificates of deposit, corporate debt and municipal securities, United States Treasury and Government agency securities, and equity securities and, by policy, we limit the amount of credit exposure with any one financial institution or commercial issuer. We have not experienced any material credit losses on our investments.</span></div><div style="text-indent:22.5pt;margin-top:9pt;"><span style="background-color:rgb(255,255,255, 0.0);color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;">A majority of our accounts receivable are derived from sales to large multinational semiconductor manufacturers located throughout the world, with a majority located in Asia. In recent years, our customer base has become increasingly concentrated due to corporate consolidations, acquisitions and business closures, and to the extent that these customers experience liquidity </span></div><div style="margin-top:9pt;"><span style="background-color:rgb(255,255,255, 0.0);color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;">issues in the future, we may be required to incur additional bad debt expense with respect to trade receivables. We perform ongoing credit evaluations of our customers’ financial condition and generally require little to no collateral to secure accounts receivable. We maintain an allowance for potential credit losses based upon expected collectibility risk of all accounts receivable. In addition, we may utilize letters of credit, credit insurance or non-recourse factoring to mitigate credit risk when considered appropriate.</span></div><div style="text-indent:22.5pt;margin-top:9pt;"><span style="background-color:rgb(255,255,255, 0.0);color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;">We are exposed to credit loss in the event of non-performance by counterparties on the foreign exchange contracts that we use in hedging activities and in certain factoring transactions. These counterparties are large international financial institutions, and to date no such counterparty has failed to meet its financial obligations to us under such contracts.</span></div>
CY2020	klac	Standard Warranty Coverage StandardWarrantyCoverage	P12M
CY2020	klac	Deferred Compensation Arrangement With Individual Optional Payout Period DeferredCompensationArrangementWithIndividualOptionalPayoutPeriod	P15Y
CY2020Q2	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	1107413000	USD
CY2019Q2	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	990113000	USD
CY2018Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	635878000	USD
CY2020	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	117300000	USD
CY2020	klac	Increase Decrease In Accounts Receivable Percentage IncreaseDecreaseInAccountsReceivablePercentage	0.12
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	354235000	USD
CY2019	klac	Increase Decrease In Accounts Receivable Percentage IncreaseDecreaseInAccountsReceivablePercentage	0.56
CY2020Q2	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	99876000	USD
CY2019Q2	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	94015000	USD
CY2018Q3	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	14727000	USD
CY2020	us-gaap	Increase Decrease In Contract With Customer Asset IncreaseDecreaseInContractWithCustomerAsset	5861000	USD
CY2020	klac	Increase Decrease In Contract With Customer Asset Percentage IncreaseDecreaseInContractWithCustomerAssetPercentage	0.06
CY2019	us-gaap	Increase Decrease In Contract With Customer Asset IncreaseDecreaseInContractWithCustomerAsset	79288000	USD
CY2019	klac	Increase Decrease In Contract With Customer Asset Percentage IncreaseDecreaseInContractWithCustomerAssetPercentage	5.38
CY2020Q2	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	666055000	USD
CY2019Q2	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	587789000	USD
CY2018Q3	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	556691000	USD
CY2020	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	78266000	USD
CY2020	klac	Increase Decrease In Contract With Customer Liability Percentage IncreaseDecreaseInContractWithCustomerLiabilityPercentage	0.13
CY2019	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	31098000	USD
CY2019	klac	Increase Decrease In Contract With Customer Liability Percentage IncreaseDecreaseInContractWithCustomerLiabilityPercentage	0.06
CY2020	klac	Revenue Remainder Payable Acceptance Period RevenueRemainderPayableAcceptancePeriod	P30D
CY2020	us-gaap	Contract With Customer Asset Reclassified To Receivable ContractWithCustomerAssetReclassifiedToReceivable	70900000	USD
CY2020	us-gaap	Contract With Customer Asset Cumulative Catch Up Adjustment To Revenue Modification Of Contract ContractWithCustomerAssetCumulativeCatchUpAdjustmentToRevenueModificationOfContract	71400000	USD
CY2020	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	456000000.0	USD
CY2020Q2	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	2130000000	USD
CY2020Q2	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P12M
CY2020Q2	us-gaap	Cash Cash	460800000	USD
CY2020Q2	klac	Time Deposit Fair Value TimeDepositFairValue	78700000	USD
CY2019Q2	us-gaap	Cash Cash	479800000	USD
CY2019Q2	klac	Time Deposit Fair Value TimeDepositFairValue	99000000.0	USD
CY2020Q2	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	1119235000	USD
CY2019Q2	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	1002114000	USD
CY2020Q2	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	11822000	USD
CY2019Q2	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	12001000	USD
CY2020Q2	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	1107413000	USD
CY2019Q2	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	990113000	USD
CY2020Q2	us-gaap	Other Inventories Spare Parts OtherInventoriesSpareParts	338608000	USD
CY2019Q2	us-gaap	Other Inventories Spare Parts OtherInventoriesSpareParts	328515000	USD
CY2020Q2	us-gaap	Inventory Raw Materials InventoryRawMaterials	478594000	USD
CY2019Q2	us-gaap	Inventory Raw Materials InventoryRawMaterials	444627000	USD
CY2020Q2	us-gaap	Inventory Work In Process InventoryWorkInProcess	334965000	USD
CY2019Q2	us-gaap	Inventory Work In Process InventoryWorkInProcess	285191000	USD
CY2020Q2	us-gaap	Inventory Finished Goods InventoryFinishedGoods	158818000	USD
CY2019Q2	us-gaap	Inventory Finished Goods InventoryFinishedGoods	204167000	USD
CY2020Q2	us-gaap	Inventory Net InventoryNet	1310985000	USD
CY2019Q2	us-gaap	Inventory Net InventoryNet	1262500000	USD
CY2020Q2	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	99876000	USD
CY2019Q2	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	94015000	USD
CY2020Q2	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	77219000	USD
CY2019Q2	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	70721000	USD
CY2020Q2	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	74955000	USD
CY2019Q2	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	88387000	USD
CY2020Q2	us-gaap	Prepaid Taxes PrepaidTaxes	56809000	USD
CY2019Q2	us-gaap	Prepaid Taxes PrepaidTaxes	51889000	USD
CY2020Q2	klac	Other Current Assets OtherCurrentAssets	15816000	USD
CY2019Q2	klac	Other Current Assets OtherCurrentAssets	18065000	USD
CY2020Q2	us-gaap	Other Assets Current OtherAssetsCurrent	324675000	USD
CY2019Q2	us-gaap	Other Assets Current OtherAssetsCurrent	323077000	USD
CY2020Q2	us-gaap	Land Land	67858000	USD
CY2019Q2	us-gaap	Land Land	67883000	USD
CY2020Q2	klac	Buildings And Leasehold Improvements BuildingsAndLeaseholdImprovements	405238000	USD
CY2019Q2	klac	Buildings And Leasehold Improvements BuildingsAndLeaseholdImprovements	402678000	USD
CY2020Q2	us-gaap	Machinery And Equipment Gross MachineryAndEquipmentGross	677627000	USD
CY2019Q2	us-gaap	Machinery And Equipment Gross MachineryAndEquipmentGross	669316000	USD
CY2020Q2	us-gaap	Furniture And Fixtures Gross FurnitureAndFixturesGross	29964000	USD
CY2019Q2	us-gaap	Furniture And Fixtures Gross FurnitureAndFixturesGross	28282000	USD
CY2020Q2	us-gaap	Construction In Progress Gross ConstructionInProgressGross	93736000	USD
CY2019Q2	us-gaap	Construction In Progress Gross ConstructionInProgressGross	26029000	USD
CY2020Q2	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1274423000	USD
CY2019Q2	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1194188000	USD
CY2020Q2	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	754599000	USD
CY2019Q2	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	745389000	USD
CY2020Q2	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	519824000	USD
CY2020Q2	us-gaap	Taxes Payable Current TaxesPayableCurrent	35640000	USD
CY2019Q2	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	448799000	USD
CY2020Q2	us-gaap	Deferred Compensation Plan Assets DeferredCompensationPlanAssets	213487000	USD
CY2019Q2	us-gaap	Deferred Compensation Plan Assets DeferredCompensationPlanAssets	207581000	USD
CY2020Q2	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	100790000	USD
CY2020Q2	klac	Other Non Current Assets OtherNonCurrentAssets	48702000	USD
CY2019Q2	klac	Other Non Current Assets OtherNonCurrentAssets	58392000	USD
CY2020Q2	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	362979000	USD
CY2019Q2	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	265973000	USD
CY2020Q2	us-gaap	Defined Benefit Pension Plan Liabilities Current DefinedBenefitPensionPlanLiabilitiesCurrent	215167000	USD
CY2019Q2	us-gaap	Defined Benefit Pension Plan Liabilities Current DefinedBenefitPensionPlanLiabilitiesCurrent	208926000	USD
CY2020Q2	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	251379000	USD
CY2019Q2	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	226462000	USD
CY2020Q2	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	183435000	USD
CY2019Q2	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	202647000	USD
CY2020Q2	us-gaap	Accrued Marketing Costs Current AccruedMarketingCostsCurrent	114896000	USD
CY2019Q2	us-gaap	Accrued Marketing Costs Current AccruedMarketingCostsCurrent	133677000	USD
CY2019Q2	us-gaap	Taxes Payable Current TaxesPayableCurrent	23350000	USD
CY2020Q2	us-gaap	Interest And Dividends Payable Current InterestAndDividendsPayableCurrent	36265000	USD
CY2019Q2	us-gaap	Interest And Dividends Payable Current InterestAndDividendsPayableCurrent	31992000	USD
CY2020Q2	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	28994000	USD
CY2020Q2	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	865776000	USD
CY2019Q2	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	827054000	USD
CY2020Q2	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	78911000	USD
CY2019Q2	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	79622000	USD
CY2020Q2	us-gaap	Accrued Income Taxes Noncurrent AccruedIncomeTaxesNoncurrent	383447000	USD
CY2019Q2	us-gaap	Accrued Income Taxes Noncurrent AccruedIncomeTaxesNoncurrent	392266000	USD
CY2020Q2	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	70885000	USD
CY2020Q2	klac	Other Noncurrent Liabilities1 OtherNoncurrentLiabilities1	139041000	USD
CY2019Q2	klac	Other Noncurrent Liabilities1 OtherNoncurrentLiabilities1	116009000	USD
CY2020Q2	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	672284000	USD
CY2019Q2	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	587897000	USD
CY2020	us-gaap	Investment Income Interest InvestmentIncomeInterest	21646000	USD
CY2019	us-gaap	Investment Income Interest InvestmentIncomeInterest	40367000	USD
CY2018	us-gaap	Investment Income Interest InvestmentIncomeInterest	36869000	USD
CY2020	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-4236000	USD
CY2019	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	322000	USD
CY2018	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-708000	USD
CY2020	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	297000	USD
CY2019	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	-1294000	USD
CY2018	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	-209000	USD
CY2020	klac	Other Nonoperating Income Expense Miscellaneous OtherNonoperatingIncomeExpenseMiscellaneous	-20385000	USD
CY2019	klac	Other Nonoperating Income Expense Miscellaneous OtherNonoperatingIncomeExpenseMiscellaneous	-7933000	USD
CY2018	klac	Other Nonoperating Income Expense Miscellaneous OtherNonoperatingIncomeExpenseMiscellaneous	-5470000	USD
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-2678000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	31462000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	30482000	USD
CY2020Q2	klac	Cash Cash Equivalentsand Availableforsale Debt Securities Excluding Time Deposits Amortized Cost CashCashEquivalentsandAvailableforsaleDebtSecuritiesExcludingTimeDepositsAmortizedCost	1390874000	USD
CY2020Q2	klac	Cash Cash Equivalents And Availableforsale Debt Securities Accumulated Gross Unrealized Gain CashCashEquivalentsAndAvailableforsaleDebtSecuritiesAccumulatedGrossUnrealizedGain	4748000	USD
CY2020Q2	klac	Cash Cash Equivalents And Availableforsale Debt Securities Accumulated Gross Unrealized Losses CashCashEquivalentsAndAvailableforsaleDebtSecuritiesAccumulatedGrossUnrealizedLosses	59000	USD
CY2020Q2	klac	Cash Cash Equivalentsand Availableforsale Debt Securities Excluding Time Deposits CashCashEquivalentsandAvailableforsaleDebtSecuritiesExcludingTimeDeposits	1395563000	USD
CY2020Q2	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	124153000	USD
CY2020Q2	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	124153000	USD
CY2020Q2	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	741374000	USD
CY2020Q2	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	4748000	USD
CY2020Q2	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	59000	USD
CY2020Q2	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	746063000	USD
CY2019Q2	klac	Cash Cash Equivalentsand Availableforsale Debt Securities Excluding Time Deposits Amortized Cost CashCashEquivalentsandAvailableforsaleDebtSecuritiesExcludingTimeDepositsAmortizedCost	1161649000	USD
CY2019Q2	klac	Cash Cash Equivalents And Availableforsale Debt Securities Accumulated Gross Unrealized Gain CashCashEquivalentsAndAvailableforsaleDebtSecuritiesAccumulatedGrossUnrealizedGain	189000	USD
CY2019Q2	klac	Cash Cash Equivalents And Availableforsale Debt Securities Accumulated Gross Unrealized Losses CashCashEquivalentsAndAvailableforsaleDebtSecuritiesAccumulatedGrossUnrealizedLosses	1232000	USD
CY2019Q2	klac	Cash Cash Equivalentsand Availableforsale Debt Securities Excluding Time Deposits CashCashEquivalentsandAvailableforsaleDebtSecuritiesExcludingTimeDeposits	1160606000	USD
CY2019Q2	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	99006000	USD
CY2019Q2	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	99006000	USD
CY2019Q2	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	724449000	USD
CY2019Q2	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	172000	USD
CY2019Q2	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	1230000	USD
CY2019Q2	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	723391000	USD
CY2020Q2	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	40	investment
CY2020Q2	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	74260000	USD
CY2020Q2	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	59000	USD
CY2020Q2	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	415915000	USD
CY2020Q2	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	418169000	USD
CY2020Q2	klac	Debt Securities Availableforsale Maturity Allocatedand Single Maturity Dateafter One Through Three Years Amortized Cost DebtSecuritiesAvailableforsaleMaturityAllocatedandSingleMaturityDateafterOneThroughThreeYearsAmortizedCost	325459000	USD
CY2020Q2	klac	Debt Securities Availableforsale Maturity Allocatedand Single Maturity Dateafter One Through Three Years Fair Value DebtSecuritiesAvailableforsaleMaturityAllocatedandSingleMaturityDateafterOneThroughThreeYearsFairValue	327894000	USD
CY2020Q2	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	741374000	USD
CY2020Q2	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	746063000	USD
CY2020	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	1400000	USD
CY2020Q2	us-gaap	Business Combination Consideration Transferred1 BusinessCombinationConsiderationTransferred1	11400000	USD
CY2020Q2	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	2200000	USD
CY2019Q3	us-gaap	Business Combination Contingent Consideration Arrangements Range Of Outcomes Value High BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh	60000000.0	USD
CY2020Q2	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Cash And Equivalents BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents	6600000	USD
CY2019	us-gaap	Number Of Businesses Acquired NumberOfBusinessesAcquired	5	company
CY2020	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	40200000	USD
CY2020	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	4	segment
CY2020	us-gaap	Number Of Reporting Units NumberOfReportingUnits	6	reporting_unit
CY2018Q2	us-gaap	Goodwill Goodwill	354698000	USD
CY2019	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	1818951000	USD
CY2019	us-gaap	Goodwill Purchase Accounting Adjustments GoodwillPurchaseAccountingAdjustments	38216000	USD
CY2019	us-gaap	Goodwill Transfers GoodwillTransfers	0	USD
CY2019	us-gaap	Goodwill Translation And Purchase Accounting Adjustments GoodwillTranslationAndPurchaseAccountingAdjustments	-7000	USD
CY2019Q2	us-gaap	Goodwill Goodwill	2211858000	USD
CY2020	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	56180000	USD
CY2020	us-gaap	Goodwill Purchase Accounting Adjustments GoodwillPurchaseAccountingAdjustments	34134000	USD
CY2020	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	256649000	USD
CY2020	us-gaap	Goodwill Translation And Purchase Accounting Adjustments GoodwillTranslationAndPurchaseAccountingAdjustments	-121000	USD
CY2020Q2	us-gaap	Goodwill Goodwill	2045402000	USD
CY2020	klac	Goodwill Impairment Income Approach Percent GoodwillImpairmentIncomeApproachPercent	75
CY2020	klac	Goodwill Impairment Market Approach Percent GoodwillImpairmentMarketApproachPercent	25
CY2020Q2	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	534200000	USD
CY2018Q2	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	277600000	USD
CY2019Q2	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	277600000	USD
CY2020Q2	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	1743487000	USD
CY2020Q2	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	527808000	USD
CY2020Q2	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	1215679000	USD
CY2019Q2	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	1680421000	USD
CY2019Q2	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	307251000	USD
CY2019Q2	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	1373170000	USD
CY2020Q2	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	1919321000	USD
CY2020Q2	klac	Intangible Assets Accumulated Amortization And Impairment IntangibleAssetsAccumulatedAmortizationAndImpairment	527908000	USD
CY2020Q2	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	1391413000	USD
CY2019Q2	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	1867921000	USD
CY2019Q2	klac	Intangible Assets Accumulated Amortization And Impairment IntangibleAssetsAccumulatedAmortizationAndImpairment	307251000	USD
CY2019Q2	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	1560670000	USD
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	220579000	USD
CY2019Q2	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	17880000	USD
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	34702000	USD
CY2019Q2	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	8738000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	87392000	USD
CY2020Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	197817000	USD
CY2020Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	195239000	USD
CY2020Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	194147000	USD
CY2020Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	191630000	USD
CY2020Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	179421000	USD
CY2020Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	257425000	USD
CY2020Q2	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	1215679000	USD
CY2020Q2	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	3500000000	USD
CY2019Q2	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	3450000000	USD
CY2020Q2	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	8167000	USD
CY2020Q2	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	22163000	USD
CY2020Q2	us-gaap	Long Term Debt LongTermDebt	3469670000	USD
CY2019Q2	us-gaap	Long Term Debt LongTermDebt	3423382000	USD
CY2020Q2	us-gaap	Long Term Debt Current LongTermDebtCurrent	0	USD
CY2019Q2	us-gaap	Long Term Debt Current LongTermDebtCurrent	249999000	USD
CY2020Q2	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	3469670000	USD
CY2019Q2	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	3173383000	USD
CY2020Q2	us-gaap	Long Term Debt LongTermDebt	3469670000	USD
CY2019Q2	us-gaap	Long Term Debt LongTermDebt	3423382000	USD
CY2020Q2	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	50000000.0	USD
CY2020Q2	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	1250000000	USD
CY2020Q2	klac	Long Term Debt Maturities Repayments Of Principal After Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFour	2200000000	USD
CY2020	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-22500000	USD
CY2020	us-gaap	Operating Lease Expense OperatingLeaseExpense	35100000	USD
CY2020Q2	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P5Y1M6D
CY2020Q2	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0199
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	24549000	USD
CY2020Q2	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	30628000	USD
CY2020Q2	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	22750000	USD
CY2020Q2	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	15410000	USD
CY2020Q2	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	10221000	USD
CY2020Q2	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	8508000	USD
CY2020Q2	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	18226000	USD
CY2020Q2	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	105743000	USD
CY2020Q2	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	5864000	USD
CY2020Q2	us-gaap	Operating Lease Liability OperatingLeaseLiability	99879000	USD
CY2019Q2	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	30296000	USD
CY2019Q2	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	22250000	USD
CY2019Q2	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	16217000	USD
CY2019Q2	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	11878000	USD
CY2019Q2	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	7912000	USD
CY2019Q2	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	15018000	USD
CY2019Q2	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	103571000	USD
CY2019	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	13500000	USD
CY2018	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	10400000	USD
CY2017Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	4710000	shares
CY2018Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	3680000	shares
CY2019	klac	Sharebased Compensation Arrangementby Sharebased Payment Award Increase Decreasein Numberof Shares Availablefor Grant SharebasedCompensationArrangementbySharebasedPaymentAwardIncreaseDecreaseinNumberofSharesAvailableforGrant	12000000	shares
CY2019	klac	Sharebased Compensation Arrangementby Sharebased Payment Award Options Grants Forfeituresand Expirationsin Period SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsGrantsForfeituresandExpirationsinPeriod	1660000	shares
CY2019Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	11613000	shares
CY2020Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	10760000	shares
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	5.13
CY2020	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	111381000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	94194000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	62784000	USD
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Accelerated Compensation Cost ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost	10900000	USD
CY2020Q2	klac	Stock Based Compensation Capitalized As Inventory StockBasedCompensationCapitalizedAsInventory	6752000	USD
CY2019Q2	klac	Stock Based Compensation Capitalized As Inventory StockBasedCompensationCapitalizedAsInventory	4819000	USD
CY2019	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	1103202000	USD
CY2020Q2	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Equity Instruments Other Than Options Aggregate Intrinsic Value Outstanding SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding	438100000	USD
CY2020Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Maximum Employee Subscription Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate	0.15
CY2020	klac	Employee Stock Purchase Plan Offering Period EmployeeStockPurchasePlanOfferingPeriod	P6M
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Discount From Market Price Offering Date ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPriceOfferingDate	0.85
CY2020	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	74849000	USD
CY2019	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	64828000	USD
CY2018	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	61452000	USD
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Shares Purchased For Award ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedForAward	561000	shares
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Shares Purchased For Award ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedForAward	843000	shares
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Shares Purchased For Award ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedForAward	733000	shares
CY2020	klac	Tax Benefits From Espp TaxBenefitsFromEspp	3237000	USD
CY2019	klac	Tax Benefits From Espp TaxBenefitsFromEspp	1133000	USD
CY2018	klac	Tax Benefits From Espp TaxBenefitsFromEspp	1664000	USD
CY2020	klac	Weighted Average Fair Value Per Share WeightedAverageFairValuePerShare	36.61
CY2019	klac	Weighted Average Fair Value Per Share WeightedAverageFairValuePerShare	21.72
CY2018	klac	Weighted Average Fair Value Per Share WeightedAverageFairValuePerShare	21.95
CY2020Q2	klac	Espp Maximum Annual Share Replenishment ESPPMaximumAnnualShareReplenishment	2000000.0	shares
CY2020Q2	klac	Number Of Espp Shares Available For Future Issuance NumberOfEsppSharesAvailableForFutureIssuance	2100000	shares
CY2020	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	821083000	USD
CY2020	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	5271000	USD
CY2018	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	203169000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	1216785000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	1175617000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	802265000	USD
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	156797000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	156053000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	156346000	shares
CY2020	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	1208000	shares
CY2019	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	896000	shares
CY2018	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	1032000	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	158005000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	156949000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	157378000	shares
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	7.76
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	7.53
CY2020	klac	Defined Benefit Plan Benefit Obligation Interest Cost DefinedBenefitPlanBenefitObligationInterestCost	1084000	USD
CY2019	klac	Defined Benefit Plan Benefit Obligation Interest Cost DefinedBenefitPlanBenefitObligationInterestCost	1132000	USD
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	7.70
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	7.49
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	5.10
CY2020	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	22000	shares
CY2019	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	227000	shares
CY2018	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent Of Match DefinedContributionPlanEmployerMatchingContributionPercentOfMatch	0.50
	klac	Defined Contribution Plan Employer Matching Contribution Employees Contribution Matched DefinedContributionPlanEmployerMatchingContributionEmployeesContributionMatched	8000	USD
	us-gaap	Defined Contribution Plan Maximum Annual Contributions Per Employee Amount DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount	4000	USD
CY2020	us-gaap	Deferred Compensation Arrangement With Individual Contributions By Employer DeferredCompensationArrangementWithIndividualContributionsByEmployer	24600000	USD
CY2019	us-gaap	Deferred Compensation Arrangement With Individual Contributions By Employer DeferredCompensationArrangementWithIndividualContributionsByEmployer	18600000	USD
CY2018	us-gaap	Deferred Compensation Arrangement With Individual Contributions By Employer DeferredCompensationArrangementWithIndividualContributionsByEmployer	16000000.0	USD
CY2019Q2	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	115490000	USD
CY2018Q2	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	96682000	USD
CY2020	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	4823000	USD
CY2019	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	4220000	USD
CY2020	us-gaap	Defined Benefit Plan Benefit Obligation Contributions By Plan Participant DefinedBenefitPlanBenefitObligationContributionsByPlanParticipant	78000	USD
CY2019	us-gaap	Defined Benefit Plan Benefit Obligation Contributions By Plan Participant DefinedBenefitPlanBenefitObligationContributionsByPlanParticipant	69000	USD
CY2020	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	496000	USD
CY2019	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	-4187000	USD
CY2020	us-gaap	Defined Benefit Plan Benefit Obligation Benefits Paid DefinedBenefitPlanBenefitObligationBenefitsPaid	3119000	USD
CY2019	us-gaap	Defined Benefit Plan Benefit Obligation Benefits Paid DefinedBenefitPlanBenefitObligationBenefitsPaid	1755000	USD
CY2020	us-gaap	Defined Benefit Plan Business Combinations And Acquisitions Benefit Obligation DefinedBenefitPlanBusinessCombinationsAndAcquisitionsBenefitObligation	0	USD
CY2019	us-gaap	Defined Benefit Plan Business Combinations And Acquisitions Benefit Obligation DefinedBenefitPlanBusinessCombinationsAndAcquisitionsBenefitObligation	11095000	USD
CY2020	us-gaap	Defined Benefit Plan Foreign Currency Exchange Rate Changes Benefit Obligation DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation	-2010000	USD
CY2019	us-gaap	Defined Benefit Plan Foreign Currency Exchange Rate Changes Benefit Obligation DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation	140000	USD
CY2020Q2	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	119870000	USD
CY2019Q2	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	115490000	USD
CY2019Q2	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	33555000	USD
CY2018Q2	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	27932000	USD
CY2020	us-gaap	Defined Benefit Plan Actual Return On Plan Assets DefinedBenefitPlanActualReturnOnPlanAssets	1264000	USD
CY2019	us-gaap	Defined Benefit Plan Actual Return On Plan Assets DefinedBenefitPlanActualReturnOnPlanAssets	854000	USD
CY2019	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	3587000	USD
CY2020	klac	Defined Benefit Plan Benefits And Expenses Paid DefinedBenefitPlanBenefitsAndExpensesPaid	3115000	USD
CY2019	klac	Defined Benefit Plan Benefits And Expenses Paid DefinedBenefitPlanBenefitsAndExpensesPaid	1752000	USD
CY2020	us-gaap	Defined Benefit Plan Business Combinations And Acquisitions Plan Assets DefinedBenefitPlanBusinessCombinationsAndAcquisitionsPlanAssets	0	USD
CY2019	us-gaap	Defined Benefit Plan Business Combinations And Acquisitions Plan Assets DefinedBenefitPlanBusinessCombinationsAndAcquisitionsPlanAssets	3424000	USD
CY2020	us-gaap	Defined Benefit Plan Plan Assets Foreign Currency Translation Gain Loss DefinedBenefitPlanPlanAssetsForeignCurrencyTranslationGainLoss	953000	USD
CY2019	us-gaap	Defined Benefit Plan Plan Assets Foreign Currency Translation Gain Loss DefinedBenefitPlanPlanAssetsForeignCurrencyTranslationGainLoss	-490000	USD
CY2020Q2	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	37928000	USD
CY2019Q2	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	33555000	USD
CY2020Q2	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	-81942000	USD
CY2019Q2	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	-81935000	USD
CY2020Q2	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Accumulated Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation	75550000	USD
CY2019Q2	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Accumulated Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation	72508000	USD
CY2020Q2	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Projected Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation	119870000	USD
CY2019Q2	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Projected Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation	115490000	USD
CY2020Q2	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Fair Value Of Plan Assets DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets	37928000	USD
CY2019Q2	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Fair Value Of Plan Assets DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets	33555000	USD
CY2020	klac	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate Minimum DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRateMinimum	0.006
CY2020	klac	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate Maximum DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRateMaximum	0.017
CY2019	klac	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate Minimum DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRateMinimum	0.003
CY2019	klac	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate Maximum DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRateMaximum	0.017
CY2018	klac	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate Minimum DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRateMinimum	0.005
CY2018	klac	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate Maximum DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRateMaximum	0.023
CY2020	klac	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets Minimum DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssetsMinimum	0.008
CY2020	klac	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets Maximum DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssetsMaximum	0.029
CY2019	klac	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets Minimum DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssetsMinimum	0.010
CY2019	klac	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets Maximum DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssetsMaximum	0.029
CY2018	klac	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets Minimum DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssetsMinimum	0.013
CY2018	klac	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets Maximum DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssetsMaximum	0.029
CY2020	klac	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Rate Of Compensation Increase Minimum DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncreaseMinimum	0.018
CY2020	klac	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Rate Of Compensation Increase Maximum DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncreaseMaximum	0.045
CY2019	klac	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Rate Of Compensation Increase Minimum DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncreaseMinimum	0.018
CY2019	klac	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Rate Of Compensation Increase Maximum DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncreaseMaximum	0.045
CY2018	klac	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Rate Of Compensation Increase Minimum DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncreaseMinimum	0.030
CY2018	klac	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Rate Of Compensation Increase Maximum DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncreaseMaximum	0.045
CY2020Q2	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Transition Assets Obligations Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetTransitionAssetsObligationsBeforeTax	-310000	USD
CY2019Q2	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Transition Assets Obligations Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetTransitionAssetsObligationsBeforeTax	-242000	USD
CY2020Q2	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Prior Service Cost Credit Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax	0	USD
CY2019Q2	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Prior Service Cost Credit Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax	4000	USD
CY2020Q2	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Gains Losses Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax	-23157000	USD
CY2019Q2	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Gains Losses Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax	-25721000	USD
CY2020Q2	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax	23467000	USD
CY2019Q2	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax	25967000	USD
CY2020Q2	us-gaap	Defined Benefit Plan Expected Amortization Of Prior Service Cost Credit Next Fiscal Year DefinedBenefitPlanExpectedAmortizationOfPriorServiceCostCreditNextFiscalYear	0	USD
CY2020Q2	us-gaap	Defined Benefit Plan Expected Amortization Of Gain Loss Next Fiscal Year DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear	-1050000	USD
CY2020Q2	us-gaap	Defined Benefit Plan Expected Amortization Next Fiscal Year DefinedBenefitPlanExpectedAmortizationNextFiscalYear	1050000	USD
CY2020	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	4823000	USD
CY2019	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	4220000	USD
CY2018	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	4127000	USD
CY2020	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	1086000	USD
CY2019	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	1132000	USD
CY2018	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	1302000	USD
CY2020	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	475000	USD
CY2019	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	476000	USD
CY2018	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	428000	USD
CY2020	us-gaap	Defined Benefit Plan Amortization Of Transition Asset Obligation DefinedBenefitPlanAmortizationOfTransitionAssetObligation	0	USD
CY2019	us-gaap	Defined Benefit Plan Amortization Of Transition Asset Obligation DefinedBenefitPlanAmortizationOfTransitionAssetObligation	0	USD
CY2018	us-gaap	Defined Benefit Plan Amortization Of Transition Asset Obligation DefinedBenefitPlanAmortizationOfTransitionAssetObligation	0	USD
CY2020	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	3000	USD
CY2019	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	21000	USD
CY2018	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	26000	USD
CY2020	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-1214000	USD
CY2019	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-1047000	USD
CY2018	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-1731000	USD
CY2020	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	6651000	USD
CY2019	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	5944000	USD
CY2018	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	6758000	USD
CY2020Q2	us-gaap	Defined Benefit Plan Plan Assets Target Allocation Percentage DefinedBenefitPlanPlanAssetsTargetAllocationPercentage	1
CY2019Q2	us-gaap	Defined Benefit Plan Plan Assets Target Allocation Percentage DefinedBenefitPlanPlanAssetsTargetAllocationPercentage	1
CY2020Q2	us-gaap	Defined Benefit Plan Expected Future Employer Contributions Next Fiscal Year DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear	4300000	USD
CY2020Q2	klac	Defined Benefit Plan Maximum Yearly Expected Future Benefit Payments DefinedBenefitPlanMaximumYearlyExpectedFutureBenefitPayments	5100000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	653666000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	752844000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	545401000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	716015000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	563867000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	750830000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	739916000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1316711000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1296231000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1455931000	USD
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	108136000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	82460000	USD
CY2020	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-65425000	USD
CY2019	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-29939000	USD
CY2018	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	844000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-93342000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-26185000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	101072000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	101686000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	121214000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	504758000	USD
CY2020	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	518000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	5665000	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	6422000	USD
CY2020	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	86374000	USD
CY2019	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	59274000	USD
CY2018	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	41414000	USD
CY2020	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	195028000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	147399000	USD
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	552594000	USD
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-26743000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	1636000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	98702000	USD
CY2020	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-1174000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	2118000	USD
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	1526000	USD
CY2020Q2	klac	Deferred Tax Assets Tax Credits And Net Operating Losses DeferredTaxAssetsTaxCreditsAndNetOperatingLosses	214305000	USD
CY2019Q2	klac	Deferred Tax Assets Tax Credits And Net Operating Losses DeferredTaxAssetsTaxCreditsAndNetOperatingLosses	208572000	USD
CY2020Q2	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	67729000	USD
CY2019Q2	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	65065000	USD
CY2020Q2	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	8871000	USD
CY2019Q2	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	9432000	USD
CY2020Q2	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves	73939000	USD
CY2019Q2	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves	67249000	USD
CY2020Q2	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Other DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther	20526000	USD
CY2019Q2	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Other DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther	21633000	USD
CY2020Q2	us-gaap	Deferred Tax Assets Deferred Income DeferredTaxAssetsDeferredIncome	15786000	USD
CY2019Q2	us-gaap	Deferred Tax Assets Deferred Income DeferredTaxAssetsDeferredIncome	16126000	USD
CY2020Q2	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	5345000	USD
CY2019Q2	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	1492000	USD
CY2020Q2	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	66667000	USD
CY2019Q2	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	55518000	USD
CY2020Q2	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	473168000	USD
CY2019Q2	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	445087000	USD
CY2020Q2	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	181846000	USD
CY2019Q2	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	166571000	USD
CY2020Q2	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	291322000	USD
CY2019Q2	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	278516000	USD
CY2020Q2	us-gaap	Deferred Tax Liabilities Undistributed Foreign Earnings DeferredTaxLiabilitiesUndistributedForeignEarnings	257757000	USD
CY2019Q2	us-gaap	Deferred Tax Liabilities Undistributed Foreign Earnings DeferredTaxLiabilitiesUndistributedForeignEarnings	243491000	USD
CY2020Q2	us-gaap	Deferred Tax Liabilities Tax Deferred Income DeferredTaxLiabilitiesTaxDeferredIncome	18111000	USD
CY2019Q2	us-gaap	Deferred Tax Liabilities Tax Deferred Income DeferredTaxLiabilitiesTaxDeferredIncome	15718000	USD
CY2020Q2	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	439685000	USD
CY2019Q2	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	515643000	USD
CY2020Q2	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	715553000	USD
CY2019Q2	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	774852000	USD
CY2020Q2	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	424231000	USD
CY2019Q2	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	496336000	USD
CY2020Q2	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	245300000	USD
CY2020Q2	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	181800000	USD
CY2019Q2	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	166600000	USD
CY2020Q2	klac	Undistributed Earnings For Certain Foreign Subsidiaries UndistributedEarningsForCertainForeignSubsidiaries	3030000000.00	USD
CY2020Q2	us-gaap	Deferred Tax Liability Not Recognized Amount Of Unrecognized Deferred Tax Liability Undistributed Earnings Of Foreign Subsidiaries DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityUndistributedEarningsOfForeignSubsidiaries	111900000	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.281
CY2020	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.002
CY2019	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.005
CY2018	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.005
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.121
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.105
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.110
CY2020	klac	Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Percent EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActPercent	0
CY2020	klac	Effective Income Tax Rate Reconciliation Global Intangible Low Taxed Income Percent EffectiveIncomeTaxRateReconciliationGlobalIntangibleLowTaxedIncomePercent	0.030
CY2019	klac	Effective Income Tax Rate Reconciliation Global Intangible Low Taxed Income Percent EffectiveIncomeTaxRateReconciliationGlobalIntangibleLowTaxedIncomePercent	0.035
CY2019	klac	Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Percent EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActPercent	-0.015
CY2018	klac	Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Percent EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActPercent	0.303
CY2018	klac	Effective Income Tax Rate Reconciliation Global Intangible Low Taxed Income Percent EffectiveIncomeTaxRateReconciliationGlobalIntangibleLowTaxedIncomePercent	0
CY2020	klac	Effective Income Tax Rate Reconciliation Foreign Derived Intangible Income Percent EffectiveIncomeTaxRateReconciliationForeignDerivedIntangibleIncomePercent	-0.050
CY2019	klac	Effective Income Tax Rate Reconciliation Foreign Derived Intangible Income Percent EffectiveIncomeTaxRateReconciliationForeignDerivedIntangibleIncomePercent	-0.040
CY2018	klac	Effective Income Tax Rate Reconciliation Foreign Derived Intangible Income Percent EffectiveIncomeTaxRateReconciliationForeignDerivedIntangibleIncomePercent	0
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	0.018
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	0.018
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	0.014
CY2020	klac	Effective Income Tax Rate Reconciliation Net Change In Tax Reserves Percent EffectiveIncomeTaxRateReconciliationNetChangeInTaxReservesPercent	0.015
CY2019	klac	Effective Income Tax Rate Reconciliation Net Change In Tax Reserves Percent EffectiveIncomeTaxRateReconciliationNetChangeInTaxReservesPercent	0.014
CY2018	klac	Effective Income Tax Rate Reconciliation Net Change In Tax Reserves Percent EffectiveIncomeTaxRateReconciliationNetChangeInTaxReservesPercent	-0.004
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Deductions Qualified Production Activities EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	0
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Deductions Qualified Production Activities EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	0
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Deductions Qualified Production Activities EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	0.011
CY2020	klac	Effective Income Tax Rate Reconciliation Nondeductible Impairment Of Goodwill Percent EffectiveIncomeTaxRateReconciliationNondeductibleImpairmentOfGoodwillPercent	0.041
CY2019	klac	Effective Income Tax Rate Reconciliation Nondeductible Impairment Of Goodwill Percent EffectiveIncomeTaxRateReconciliationNondeductibleImpairmentOfGoodwillPercent	0
CY2018	klac	Effective Income Tax Rate Reconciliation Nondeductible Impairment Of Goodwill Percent EffectiveIncomeTaxRateReconciliationNondeductibleImpairmentOfGoodwillPercent	0
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	-0.003
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.004
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	-0.001
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Restructuring Charges EffectiveIncomeTaxRateReconciliationNondeductibleExpenseRestructuringCharges	-0.026
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Restructuring Charges EffectiveIncomeTaxRateReconciliationNondeductibleExpenseRestructuringCharges	0
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Restructuring Charges EffectiveIncomeTaxRateReconciliationNondeductibleExpenseRestructuringCharges	0
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.003
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.004
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0
CY2020	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.077
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.094
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.449
CY2019Q2	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	146426000	USD
CY2018Q2	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	63994000	USD
CY2017Q2	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	68439000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Acquisition UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition	0	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Acquisition UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition	60753000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Acquisition UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition	0	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	6826000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	13001000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	4642000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	518000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	1304000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	6045000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	34278000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	26178000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	16812000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	9666000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	14569000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	16196000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	10188000	USD
CY2020Q2	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	172443000	USD
CY2019Q2	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	146426000	USD
CY2018Q2	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	63994000	USD
CY2020Q2	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	161500000	USD
CY2019Q2	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	136100000	USD
CY2018Q2	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	57900000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	4600000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	2900000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	100000	USD
CY2020Q2	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	37600000	USD
CY2019Q2	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	21800000	USD
CY2020Q2	us-gaap	Significant Change In Unrecognized Tax Benefits Is Reasonably Possible Amount Of Unrecorded Benefit SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit	10500000	USD
CY2020	klac	Receivables Sold Under Factoring Agreements ReceivablesSoldUnderFactoringAgreements	293006000	USD
CY2019	klac	Receivables Sold Under Factoring Agreements ReceivablesSoldUnderFactoringAgreements	193089000	USD
CY2018	klac	Receivables Sold Under Factoring Agreements ReceivablesSoldUnderFactoringAgreements	217462000	USD
CY2020	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	59036000	USD
CY2019	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	95436000	USD
CY2018	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	5511000	USD
CY2020Q2	us-gaap	Purchase Commitment Remaining Minimum Amount Committed PurchaseCommitmentRemainingMinimumAmountCommitted	896900000	USD
CY2020	klac	Outstanding Inventory Purchase Commitment OutstandingInventoryPurchaseCommitment	P12M
CY2020Q2	klac	Long Term Incentive Plan Committed Amount LongTermIncentivePlanCommittedAmount	197100000	USD
CY2020	klac	Guarantee Arrangements To Fund Customs Guarantees For Vat And Lc1 GuaranteeArrangementsToFundCustomsGuaranteesForVatAndLc1	81700000	USD
CY2020	klac	Outstanding Guarantee Arrangements To Fund Customs Guarantees For Vat And Lc OutstandingGuaranteeArrangementsToFundCustomsGuaranteesForVatAndLc	68700000	USD
CY2020Q2	us-gaap	Interest Rate Cash Flow Hedge Asset At Fair Value InterestRateCashFlowHedgeAssetAtFairValue	21300000	USD
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	5806424000	USD
CY2019Q2	klac	Aoci Cash Flow Hedge Cumulative Gain Loss Before Tax AOCICashFlowHedgeCumulativeGainLossBeforeTax	-10791000	USD
CY2020	us-gaap	Cost Of Revenue CostOfRevenue	2449561000	USD
CY2020	us-gaap	Interest Expense InterestExpense	160274000	USD
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-2678000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	4568904000	USD
CY2019	us-gaap	Cost Of Revenue CostOfRevenue	1869377000	USD
CY2019	us-gaap	Interest Expense InterestExpense	124604000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	31462000	USD
CY2019	us-gaap	Derivative Remaining Maturity1 DerivativeRemainingMaturity1	P7M
CY2020	us-gaap	Derivative Remaining Maturity1 DerivativeRemainingMaturity1	P7M
CY2018Q2	klac	Aoci Cash Flow Hedge Cumulative Gain Loss Before Tax AOCICashFlowHedgeCumulativeGainLossBeforeTax	2346000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	2072000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	4018000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	-16739000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	-9119000	USD
CY2020Q2	klac	Aoci Cash Flow Hedge Cumulative Gain Loss Before Tax AOCICashFlowHedgeCumulativeGainLossBeforeTax	-29602000	USD
CY2019Q2	klac	Aoci Cash Flow Hedge Cumulative Gain Loss Before Tax AOCICashFlowHedgeCumulativeGainLossBeforeTax	-10791000	USD
CY2020Q2	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	2077000	USD
CY2020Q2	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	0	USD
CY2020Q2	us-gaap	Derivative Assets DerivativeAssets	2077000	USD
CY2020Q2	us-gaap	Derivative Asset Not Offset Policy Election Deduction DerivativeAssetNotOffsetPolicyElectionDeduction	1020000	USD
CY2020Q2	us-gaap	Derivative Collateral Obligation To Return Cash DerivativeCollateralObligationToReturnCash	0	USD
CY2020Q2	us-gaap	Derivative Asset Fair Value Offset Against Collateral Net Of Not Subject To Master Netting Arrangement Policy Election DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection	1057000	USD
CY2020Q2	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	1410000	USD
CY2020Q2	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	0	USD
CY2020Q2	us-gaap	Derivative Liability Not Offset Policy Election Deduction DerivativeLiabilityNotOffsetPolicyElectionDeduction	1020000	USD
CY2020Q2	us-gaap	Derivative Liabilities DerivativeLiabilities	1410000	USD
CY2020Q2	us-gaap	Derivative Collateral Right To Reclaim Cash DerivativeCollateralRightToReclaimCash	0	USD
CY2020Q2	us-gaap	Derivative Liability Fair Value Offset Against Collateral Net Of Not Subject To Master Netting Arrangement Policy Election DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection	390000	USD
CY2019Q2	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	2557000	USD
CY2019Q2	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	0	USD
CY2019Q2	us-gaap	Derivative Assets DerivativeAssets	2557000	USD
CY2019Q2	us-gaap	Derivative Asset Not Offset Policy Election Deduction DerivativeAssetNotOffsetPolicyElectionDeduction	1397000	USD
CY2019Q2	us-gaap	Derivative Collateral Obligation To Return Cash DerivativeCollateralObligationToReturnCash	0	USD
CY2019Q2	us-gaap	Derivative Asset Fair Value Offset Against Collateral Net Of Not Subject To Master Netting Arrangement Policy Election DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection	1160000	USD
CY2019Q2	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	3334000	USD
CY2019Q2	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	0	USD
CY2019Q2	us-gaap	Derivative Liabilities DerivativeLiabilities	3334000	USD
CY2019Q2	us-gaap	Derivative Liability Not Offset Policy Election Deduction DerivativeLiabilityNotOffsetPolicyElectionDeduction	1397000	USD
CY2019Q2	us-gaap	Derivative Collateral Right To Reclaim Cash DerivativeCollateralRightToReclaimCash	0	USD
CY2019Q2	us-gaap	Derivative Liability Fair Value Offset Against Collateral Net Of Not Subject To Master Netting Arrangement Policy Election DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection	1937000	USD
CY2020	us-gaap	Revenue From Related Parties RevenueFromRelatedParties	4237000	USD
CY2019	us-gaap	Revenue From Related Parties RevenueFromRelatedParties	2402000	USD
CY2018	us-gaap	Revenue From Related Parties RevenueFromRelatedParties	474000	USD
CY2020	us-gaap	Related Party Transaction Expenses From Transactions With Related Party RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty	2414000	USD
CY2019	us-gaap	Related Party Transaction Expenses From Transactions With Related Party RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty	2881000	USD
CY2018	us-gaap	Related Party Transaction Expenses From Transactions With Related Party RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty	14723000	USD
CY2020Q2	us-gaap	Accounts Receivable Related Parties Current AccountsReceivableRelatedPartiesCurrent	2400000	USD
CY2020	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	4	segment
CY2020	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	2	segment
CY2020	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	2	segment
CY2020Q2	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	1700000	USD
CY2020	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	4	segment
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	5806424000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	4568904000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	4036701000	USD
CY2020	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	863864000	USD
CY2019	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	711030000	USD
CY2018	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	608531000	USD
CY2020	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	734149000	USD
CY2019	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	599124000	USD
CY2018	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	442304000	USD
CY2020	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	256649000	USD
CY2019	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2018	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2020	us-gaap	Interest Expense InterestExpense	160274000	USD
CY2019	us-gaap	Interest Expense InterestExpense	124604000	USD
CY2018	us-gaap	Interest Expense InterestExpense	114376000	USD
CY2020	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-22538000	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2018	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-2678000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	31462000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	30482000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1316711000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1296231000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1455931000	USD
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	5806424000	USD
CY2020	klac	Segment Percent Of Total Revenue SegmentPercentOfTotalRevenue	1
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	4568904000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	4036701000	USD
CY2019	klac	Segment Percent Of Total Revenue SegmentPercentOfTotalRevenue	1
CY2018	klac	Segment Percent Of Total Revenue SegmentPercentOfTotalRevenue	1
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	5806424000	USD
CY2020	klac	Segment Percent Of Total Revenue SegmentPercentOfTotalRevenue	1
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	4568904000	USD
CY2019	klac	Segment Percent Of Total Revenue SegmentPercentOfTotalRevenue	1
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	4036701000	USD
CY2018	klac	Segment Percent Of Total Revenue SegmentPercentOfTotalRevenue	1
CY2020	klac	Number Of Customers With Significant Revenue NumberOfCustomersWithSignificantRevenue	2	Installment
CY2019	klac	Number Of Customers With Significant Revenue NumberOfCustomersWithSignificantRevenue	1	Installment
CY2018	klac	Number Of Customers With Significant Revenue NumberOfCustomersWithSignificantRevenue	1	Installment
CY2020Q2	us-gaap	Noncurrent Assets NoncurrentAssets	519824000	USD
CY2019Q2	us-gaap	Noncurrent Assets NoncurrentAssets	448799000	USD
CY2019Q4	us-gaap	Net Income Loss NetIncomeLoss	380555000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	78452000	USD
CY2018Q4	us-gaap	Net Income Loss NetIncomeLoss	369100000	USD
CY2020	us-gaap	Restructuring Charges RestructuringCharges	7700000	USD
CY2020Q2	us-gaap	Restructuring Reserve RestructuringReserve	5700000	USD
CY2019Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1413414000	USD
CY2019Q4	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1509453000	USD
CY2020Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1423964000	USD
CY2020Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1459593000	USD
CY2019Q3	us-gaap	Gross Profit GrossProfit	809173000	USD
CY2019Q4	us-gaap	Gross Profit GrossProfit	875835000	USD
CY2020Q1	us-gaap	Gross Profit GrossProfit	833806000	USD
CY2020Q2	us-gaap	Gross Profit GrossProfit	838049000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	346525000	USD
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	411253000	USD
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.18
CY2019Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.42
CY2020Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.50
CY2020Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.65
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.16
CY2019Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.40
CY2020Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.50
CY2020Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.63
CY2018Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1093260000	USD
CY2018Q4	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1119898000	USD
CY2019Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1097311000	USD
CY2019Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1258435000	USD
CY2018Q3	us-gaap	Gross Profit GrossProfit	711873000	USD
CY2018Q4	us-gaap	Gross Profit GrossProfit	711638000	USD
CY2019Q1	us-gaap	Gross Profit GrossProfit	610366000	USD
CY2019Q2	us-gaap	Gross Profit GrossProfit	665650000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	395944000	USD
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.35
CY2018Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.43
CY2019Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.23
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.36
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.54
CY2018Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.42
CY2019Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.23
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	192728000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	217845000	USD
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.55

Files In Submission

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$KLAC
KLA CORP Stock $klac

2020 Q2 Form 10-K Financial Statement

#000031920120000047 Filed on August 07, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$KLAC KLA CORP Stock $klac

2020 Q2 Form 10-K Financial Statement

#000031920120000047 Filed on August 07, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$KLAC
KLA CORP Stock $klac