Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Purchased Intangible Assets (Purchased Intangible Assets) (Details)

v2.4.1.9
Goodwill and Purchased Intangible Assets (Purchased Intangible Assets) (Details) (USD $)
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Jun. 30, 2014
Components of purchased intangible assets          
Gross Carrying Amount $ 291,479,000us-gaap_FiniteLivedIntangibleAssetsGross   $ 291,479,000us-gaap_FiniteLivedIntangibleAssetsGross   291,479,000us-gaap_FiniteLivedIntangibleAssetsGross
Accumulated Amortization and Impairment 271,928,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization   271,928,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization   263,782,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Total 19,551,000us-gaap_FiniteLivedIntangibleAssetsNet   19,551,000us-gaap_FiniteLivedIntangibleAssetsNet   27,697,000us-gaap_FiniteLivedIntangibleAssetsNet
Intangible assets, amortization expense 4,000,000us-gaap_AmortizationOfIntangibleAssets 3,900,000us-gaap_AmortizationOfIntangibleAssets 8,100,000us-gaap_AmortizationOfIntangibleAssets 8,400,000us-gaap_AmortizationOfIntangibleAssets  
Existing technology          
Components of purchased intangible assets          
Gross Carrying Amount 141,659,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= klac_ExistingTechnologyMember
  141,659,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= klac_ExistingTechnologyMember
  141,659,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= klac_ExistingTechnologyMember
Accumulated Amortization and Impairment 130,671,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= klac_ExistingTechnologyMember
  130,671,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= klac_ExistingTechnologyMember
  126,567,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= klac_ExistingTechnologyMember
Total 10,988,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= klac_ExistingTechnologyMember
  10,988,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= klac_ExistingTechnologyMember
  15,092,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= klac_ExistingTechnologyMember
Existing technology | Minimum          
Components of purchased intangible assets          
Range of Useful Lives     4 years   4 years
Existing technology | Maximum          
Components of purchased intangible assets          
Range of Useful Lives     7 years   7 years
Patents          
Components of purchased intangible assets          
Gross Carrying Amount 57,648,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember
  57,648,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember
  57,648,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember
Accumulated Amortization and Impairment 55,698,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember
  55,698,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember
  54,398,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember
Total 1,950,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember
  1,950,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember
  3,250,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember
Patents | Minimum          
Components of purchased intangible assets          
Range of Useful Lives     6 years   6 years
Patents | Maximum          
Components of purchased intangible assets          
Range of Useful Lives     13 years   13 years
Trade name/Trademark          
Components of purchased intangible assets          
Gross Carrying Amount 19,893,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= klac_TradeNameTrademarkMember
  19,893,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= klac_TradeNameTrademarkMember
  19,893,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= klac_TradeNameTrademarkMember
Accumulated Amortization and Impairment 18,177,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= klac_TradeNameTrademarkMember
  18,177,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= klac_TradeNameTrademarkMember
  17,427,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= klac_TradeNameTrademarkMember
Total 1,716,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= klac_TradeNameTrademarkMember
  1,716,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= klac_TradeNameTrademarkMember
  2,466,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= klac_TradeNameTrademarkMember
Trade name/Trademark | Minimum          
Components of purchased intangible assets          
Range of Useful Lives     4 years   4 years
Trade name/Trademark | Maximum          
Components of purchased intangible assets          
Range of Useful Lives     10 years   10 years
Customer relationships          
Components of purchased intangible assets          
Gross Carrying Amount 54,680,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
  54,680,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
  54,680,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Accumulated Amortization and Impairment 50,357,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
  50,357,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
  48,915,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Total 4,323,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
  4,323,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
  5,765,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Customer relationships | Minimum          
Components of purchased intangible assets          
Range of Useful Lives     6 years   6 years
Customer relationships | Maximum          
Components of purchased intangible assets          
Range of Useful Lives     7 years   7 years
Other          
Components of purchased intangible assets          
Gross Carrying Amount 17,599,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= klac_OtherIntangibleMember
  17,599,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= klac_OtherIntangibleMember
  17,599,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= klac_OtherIntangibleMember
Accumulated Amortization and Impairment 17,025,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= klac_OtherIntangibleMember
  17,025,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= klac_OtherIntangibleMember
  16,475,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= klac_OtherIntangibleMember
Total $ 574,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= klac_OtherIntangibleMember
  $ 574,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= klac_OtherIntangibleMember
  1,124,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= klac_OtherIntangibleMember
Other | Minimum          
Components of purchased intangible assets          
Range of Useful Lives     0 years   0 years
Other | Maximum          
Components of purchased intangible assets          
Range of Useful Lives     1 year   1 year