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STOCK REPURCHASE PROGRAM - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2025	Sep. 30, 2025
Equity [Abstract]
Increase of stock repurchase program authorized amount	$ 5,000
Remaining shares authorized to be repurchased, amount		$ 4,470

X

- Definition

Stock Repurchase Program, Authorized Repurchase Amount, Increase During Period

+ References

No definition available.

+ Details

Name:	klac_StockRepurchaseProgramAuthorizedRepurchaseAmountIncreaseDuringPeriod
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