Quarterly report pursuant to Section 13 or 15(d)

Business Combination (Details)

v2.4.1.9
Business Combination (Details) (USD $)
In Thousands, unless otherwise specified
0 Months Ended
Mar. 28, 2014
Dec. 31, 2014
Jun. 30, 2014
Business Acquisition [Line Items]      
Goodwill   $ 335,273us-gaap_Goodwill $ 335,355us-gaap_Goodwill
Privately Held Company      
Business Acquisition [Line Items]      
Intangibles 9,400us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= klac_PrivatelyHeldCompanyMember
   
Goodwill 8,730us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= klac_PrivatelyHeldCompanyMember
   
Liabilities assumed (130)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= klac_PrivatelyHeldCompanyMember
   
Cash consideration paid $ 18,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= klac_PrivatelyHeldCompanyMember