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EQUITY, LONG-TERM INCENTIVE COMPENSATION PLANS AND NON-CONTROLLING INTEREST - Non-controlling Interest (Details) | Jun. 30, 2020
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OLTS |
Noncontrolling Interest [Line Items] |
Non-controlling interest, ownership | 84.00%
Orbograph |
Noncontrolling Interest [Line Items] |
Non-controlling interest, ownership | 94.00%
PixCell |
Noncontrolling Interest [Line Items] |
Non-controlling interest, ownership | 52.00%

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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_OwnershipAxis=klac_OrbographLtd.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_OwnershipAxis=klac_PixCellMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |