Name:	lrcx_AssetsCorrelatedToDeferredCompensationObligation
Namespace Prefix:	lrcx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Maximum period over which distributions from a deferred compensation plan account will be paid.

No definition available.

Name:	lrcx_DeferredCompensationArrangementMaximumDistributionPeriod
Namespace Prefix:	lrcx_
Data Type:	xbrli:durationItemType
Balance Type:	na
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
Balance Type:	na
Period Type:	duration

Percentage of employee contribution to 401K plan matched by employer.

No definition available.

Name:	lrcx_DefinedContributionPlanEmployerMatchingPercentage
Namespace Prefix:	lrcx_
Data Type:	num:percentItemType
Balance Type:	na
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
Balance Type:	na
Period Type:	duration

- Details

Name:	lrcx_EmployeeBenefitPlanLineItems
Namespace Prefix:	lrcx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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://www.xbrl.org/2003/role/presentationRef

-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

Name:	us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Accumulated Benefit Obligation

-URI http://asc.fasb.org/extlink&oid=6503844

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920

Name:	us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The amount of the cost recognized during the period for defined contribution plans.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 70

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

Name:	us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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
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.