KLA Corporation Quarterly report pursuant to Section 13 or 15(d)

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

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	$ 291,479,000		$ 291,479,000		291,479,000
Accumulated Amortization and Impairment	271,928,000		271,928,000		263,782,000
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	141,659,000		141,659,000		141,659,000
Accumulated Amortization and Impairment	130,671,000		130,671,000		126,567,000
Total	10,988,000		10,988,000		15,092,000
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	57,648,000		57,648,000		57,648,000
Accumulated Amortization and Impairment	55,698,000		55,698,000		54,398,000
Total	1,950,000		1,950,000		3,250,000
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	19,893,000		19,893,000		19,893,000
Accumulated Amortization and Impairment	18,177,000		18,177,000		17,427,000
Total	1,716,000		1,716,000		2,466,000
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	54,680,000		54,680,000		54,680,000
Accumulated Amortization and Impairment	50,357,000		50,357,000		48,915,000
Total	4,323,000		4,323,000		5,765,000
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	17,599,000		17,599,000		17,599,000
Accumulated Amortization and Impairment	17,025,000		17,025,000		16,475,000
Total	$ 574,000		$ 574,000		1,124,000
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