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Business Combinations - Pro Forma Information (Details) - Orbotech and three privately-held companies - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Business Acquisition
Revenues	$ 5,154,823	$ 5,079,654
Net income attributable to KLA	$ 1,288,467	$ 608,542

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(3)
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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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-Name Accounting Standards Codification
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