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Data Type:	xbrli:monetaryItemType
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Maximum period over which distributions from a deferred compensation plan account will be paid.

No definition available.

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Data Type:	xbrli:durationItemType
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Period Type:	duration

Period of time an employee must wait after opening a deferred compensation account before payment may be made from that account.

No definition available.

Name:	lrcx_DeferredCompensationPaymentWaitingPeriod
Namespace Prefix:	lrcx_
Data Type:	xbrli:durationItemType
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Period Type:	duration

Minimum percentage of employee gross pay the employee may contribute to a defined contribution plan.

No definition available.

Name:	lrcx_DefinedContributionPlanMinimumAnnualContributionsPerEmployeePercent
Namespace Prefix:	lrcx_
Data Type:	num:percentItemType
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- References

No definition available.

Name:	us-gaap_CompensationAndRetirementDisclosureAbstract
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Data Type:	xbrli:stringItemType
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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.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 710
-SubTopic 10
-Section 30
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363

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Period Type:	instant

Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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Amount of cost for defined contribution plan.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

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Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

No definition available.

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
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Data Type:	num:percentItemType
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Period Type:	duration

Percentage employer matches of the employee's percentage contribution matched.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

No definition available.