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STOCK REPURCHASE PROGRAM - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2024
Equity [Abstract] |  |
Increase of stock repurchase program authorized amount | $ 2,000.0 |
Remaining shares authorized to be repurchased, amount |  | $ 963.2

X
- Definition Stock Repurchase Program, Authorized Repurchase Amount, Increase During Period + References No definition available. + Details
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Namespace Prefix: | klac_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_EquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount remaining authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant