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Deferred Compensation Plans (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Jun. 29, 2025 | Jun. 30, 2024
Retirement Benefits [Abstract] |  |
Payment of benefits, duration after opening of a deferral subaccount or upon retirement (at least) | 3 years |
Deferred compensation plan maximum distribution period | 20 years |
Liabilities of company to plan participants | $ 423.9 | $ 385.5
Assets correlated to the deferred compensation obligation | $ 438.8 | $ 393.5

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- Definition Assets in the form of retail mutual funds and company owned life insurance policies that are correlated to the deferred compensation obligation. + References No definition available. + Details
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Namespace Prefix: | lrcx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Maximum period over which distributions from a deferred compensation plan account will be paid. + References No definition available. + Details
Name: | lrcx_DeferredCompensationArrangementMaximumDistributionPeriod
Namespace Prefix: | lrcx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Period of time an employee must wait after opening a deferred compensation account before payment may be made from that account. + References No definition available. + Details
Name: | lrcx_DeferredCompensationPaymentWaitingPeriod
Namespace Prefix: | lrcx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

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- Definition The carrying amount of the liability as of the balance sheet date to an individual under a deferred compensation arrangement. This amount may be the result of periodic accruals made over the period of active employment, or reflect termination benefits resulting contractual terms or a death benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 710 -SubTopic 10 -Name Accounting Standards Codification -Section 30 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483043/710-10-30-1 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant