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Litigation and Other Legal Matters Litigation and Other Legal Matters (Details) - California Class Actions	Oct. 21, 2015 action stockholder
Loss Contingencies
Number of stockholders filing punitive class actions | stockholder	4
Number of actions dismissed | action	4

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- Definition

Loss Contingency, Number Of Stockholders Filing Actions

+ References

No definition available.

+ Details

Name:	klac_LossContingencyNumberOfStockholdersFilingActions
Namespace Prefix:	klac_
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_LossContingenciesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Number of claims dismissed.

+ References

No definition available.

+ Details

Name:	us-gaap_LossContingencyClaimsDismissedNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

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- Details

Name:	us-gaap_LitigationCaseAxis=klac_CaliforniaClassActionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: