EQUITY-BASED COMPENSATION PLANS - Additional Information (Details)	3 Months Ended	9 Months Ended
Mar. 25, 2018 shares	Mar. 25, 2018 d period shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Options and restricted stock units vesting period (years)		3 years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock price performance measurement period \| d		50
Market-based PRSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		3 years
Percentage increase in market-based PRSUs from target		2.00%
Percentage increase in common stock price exceeding market price performance		1.00%
Market-based PRSUs \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock to be issued, vesting percentage		0.00%
Market-based PRSUs \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock to be issued, vesting percentage		150.00%
1999 ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
ESPP purchase price per share as percentage of fair market value		85.00%
Offering period		12 months
Interim purchase periods \| period		2
Shares issued \| shares	0	412,469

Change In Percentage Of Common Stock Price Over Market Price Performance

No definition available.

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

- Definition

Change In Percentage Of Target Shares

+ References

No definition available.

+ Details

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

- Definition

Number Of Trading Days For Valuation Of Shares

+ References

No definition available.

+ Details

Name:	lrcx_NumberOfTradingDaysForValuationOfShares
Namespace Prefix:	lrcx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The maximum vesting term over which an employee's right to exercise an award (stock option) or receive an award (RSU) is no longer contingent on satisfaction of either a service condition, market condition or a performance condition.

+ References

No definition available.

+ Details

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

- Definition

Percentage of market price at which ESPP allows employees to purchase stock. Price is based on the lower of market price on the first or last day of purchase period.

+ References

No definition available.

+ Details

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

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Number of Purchase Periods

+ References

No definition available.

+ Details

Name:	lrcx_SharebasedCompensationArrangementbySharebasedPaymentAwardNumberofPurchasePeriods
Namespace Prefix:	lrcx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Offering Period

+ References

No definition available.

+ Details

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

- References

No definition available.

+ Details

Name:	us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of vesting of share-based compensation awards.

+ References

+ Details

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

- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

+ Details

Name:	us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_AwardTypeAxis=lrcx_MarketBasedPerformanceRestrictedStockUnitsRsuMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=lrcx_EmployeeStockPurchasePlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: