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Segment Reporting and Geographic Information - Additional Information (Details) | 12 Months Ended
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Jun. 30, 2018 customer segment | Jun. 30, 2017 customer | Jun. 30, 2016 customer
Segment Reporting and Geographic Information |  |  |
Number of reportable segments | segment | 1 |  |
Number of customers with significant revenue | customer | 1 | 2 | 2
Segment percent of total revenues | 100.00% | 100.00% | 100.00%
Customer One |  |  |
Segment Reporting and Geographic Information |  |  |
Segment percent of total revenues | 21.00% | 23.00% | 18.00%
Customer Two |  |  |
Segment Reporting and Geographic Information |  |  |
Segment percent of total revenues |  | 16.00% | 10.00%

X
- Definition Total number of significant external customers who individually generate revenue that accounts for 10 percent or more of total revenues + References No definition available. + Details
Name: | klac_NumberOfCustomersWithSignificantRevenue
Namespace Prefix: | klac_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Segment Percent Of Total Revenue + References No definition available. + Details
Name: | klac_SegmentPercentOfTotalRevenue
Namespace Prefix: | klac_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_MajorCustomersAxis=klac_CustomerOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_MajorCustomersAxis=klac_CustomerTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |