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v3.8.0.1

Segment Reporting and Geographic Information - Additional Information (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 customer | Dec. 31, 2016 customer | Dec. 31, 2017 customer segment | Dec. 31, 2016 customer | Jun. 30, 2017 customer
Segment Reporting Information |  |  |  |  |
Number of reportable segments | segment |  |  | 1 |  |
Number of customers with significant revenue | 1 | 2 | 1 | 2 |
Segment percent of total revenues | 100.00% | 100.00% | 100.00% | 100.00% |
Number of customers with significant accounts receivable balance | 2 |  | 2 |  | 2
Customer One |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Segment percent of total revenues | 17.00% | 31.00% | 22.00% | 30.00% |
Customer Two |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Segment percent of total revenues |  | 13.00% |  | 11.00% |

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- Definition Total number of customers with individual accounts receivable balances representing 10 percent or more of total accounts receivable + References No definition available. + Details
Name: | klac_NumberOfCustomersWithSignificantAccountsReceivableBalance
Namespace Prefix: | klac_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- 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

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- 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: |