Quarterly report pursuant to Section 13 or 15(d)

Debt (Debt Issuances - Credit Facility) (Details)

v2.4.1.9
Debt (Debt Issuances - Credit Facility) (Details) (USD $)
6 Months Ended 1 Months Ended
Dec. 31, 2014
quarter
Nov. 30, 2014
Term loans and revolving credit facility    
Debt Instrument [Line Items]    
Number of consecutive quarters required to maintain ratio 4klac_DebtInstrumentCovenantComplianceNumberofConsecutiveQuarters
/ us-gaap_LongtermDebtTypeAxis
= klac_TermLoanandRevolvingCreditFacilityMember
 
Minimum interest expense coverage ratio 3.50klac_DebtInstrumentCovenantComplianceMinimumInterestExpenseCoverageRatio
/ us-gaap_LongtermDebtTypeAxis
= klac_TermLoanandRevolvingCreditFacilityMember
 
Term loans and revolving credit facility | Covenant compliance period, fiscal quarter ending December 31, 2014    
Debt Instrument [Line Items]    
Number of consecutive quarters required to maintain ratio 4klac_DebtInstrumentCovenantComplianceNumberofConsecutiveQuarters
/ klac_CovenantCompliancePeriodAxis
= klac_CovenantCompliancePeriod1Member
/ us-gaap_LongtermDebtTypeAxis
= klac_TermLoanandRevolvingCreditFacilityMember
 
Maximum leverage ratio 4.50klac_DebtInstrumentCovenantComplianceMaximumLeverageRatio
/ klac_CovenantCompliancePeriodAxis
= klac_CovenantCompliancePeriod1Member
/ us-gaap_LongtermDebtTypeAxis
= klac_TermLoanandRevolvingCreditFacilityMember
 
Term loans and revolving credit facility | Covenant compliance period, fiscal quarters ending March 31, 2015 and June 30, 2015    
Debt Instrument [Line Items]    
Maximum leverage ratio 4.25klac_DebtInstrumentCovenantComplianceMaximumLeverageRatio
/ klac_CovenantCompliancePeriodAxis
= klac_CovenantCompliancePeriod2Member
/ us-gaap_LongtermDebtTypeAxis
= klac_TermLoanandRevolvingCreditFacilityMember
 
Term loans and revolving credit facility | Covenant compliance period, fiscal quarters ending September 30, 2015 and December 31, 2015    
Debt Instrument [Line Items]    
Maximum leverage ratio 4.00klac_DebtInstrumentCovenantComplianceMaximumLeverageRatio
/ klac_CovenantCompliancePeriodAxis
= klac_CovenantCompliancePeriod3Member
/ us-gaap_LongtermDebtTypeAxis
= klac_TermLoanandRevolvingCreditFacilityMember
 
Term loans and revolving credit facility | Covenant compliance period, fiscal quarters ending March 31, 2016 through September 30, 2016    
Debt Instrument [Line Items]    
Maximum leverage ratio 3.75klac_DebtInstrumentCovenantComplianceMaximumLeverageRatio
/ klac_CovenantCompliancePeriodAxis
= klac_CovenantCompliancePeriod4Member
/ us-gaap_LongtermDebtTypeAxis
= klac_TermLoanandRevolvingCreditFacilityMember
 
Term loans and revolving credit facility | Covenant compliance period, fiscal quarters ending December 31, 2016 through March 31, 2017    
Debt Instrument [Line Items]    
Maximum leverage ratio 3.50klac_DebtInstrumentCovenantComplianceMaximumLeverageRatio
/ klac_CovenantCompliancePeriodAxis
= klac_CovenantCompliancePeriod5Member
/ us-gaap_LongtermDebtTypeAxis
= klac_TermLoanandRevolvingCreditFacilityMember
 
Term loans and revolving credit facility | Covenant compliance period, thereafter    
Debt Instrument [Line Items]    
Maximum leverage ratio 3.00klac_DebtInstrumentCovenantComplianceMaximumLeverageRatio
/ klac_CovenantCompliancePeriodAxis
= klac_CovenantCompliancePeriod6Member
/ us-gaap_LongtermDebtTypeAxis
= klac_TermLoanandRevolvingCreditFacilityMember
 
Term loans and revolving credit facility | LIBOR    
Debt Instrument [Line Items]    
Basis spread on variable rate 1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= klac_TermLoanandRevolvingCreditFacilityMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
 
Term loans and revolving credit facility | LIBOR | Minimum    
Debt Instrument [Line Items]    
Basis spread on variable rate 1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= klac_TermLoanandRevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
 
Term loans and revolving credit facility | LIBOR | Maximum    
Debt Instrument [Line Items]    
Basis spread on variable rate 1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= klac_TermLoanandRevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
 
Term Loans    
Debt Instrument [Line Items]    
Principal amount   $ 750,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MediumTermNotesMember
Term of debt instrument   5 years
Term Loans | Principal payment period, fiscal quarters ending March 31, 2015 - December 31, 2016    
Debt Instrument [Line Items]    
Periodic principal payment 9,375,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodOneMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MediumTermNotesMember
 
Term Loans | Principal payment period, fiscal quarters ending March 31, 2017 - December 31, 2017    
Debt Instrument [Line Items]    
Periodic principal payment 14,063,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodTwoMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MediumTermNotesMember
 
Term Loans | Principal payment period, fiscal quarters ending March 31, 2018 - December 31, 2019    
Debt Instrument [Line Items]    
Periodic principal payment 18,750,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodThreeMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MediumTermNotesMember
 
Term Loans | December 31, 2019    
Debt Instrument [Line Items]    
Periodic principal payment 487,500,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodFourMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MediumTermNotesMember
 
Revolving credit facility    
Debt Instrument [Line Items]    
Maximum borrowing capacity   $ 500,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
Annual commitment fee on daily undrawn balance of revolving credit facility 0.15%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
 
Revolving credit facility | Minimum    
Debt Instrument [Line Items]    
Annual commitment fee on daily undrawn balance of revolving credit facility 0.10%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Revolving credit facility | Maximum    
Debt Instrument [Line Items]    
Annual commitment fee on daily undrawn balance of revolving credit facility 0.25%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember