Accrued and Unpaid Interest

No definition available.

Name:	lrcx_AccruedandUnpaidInterest
Namespace Prefix:	lrcx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

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

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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

- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph e
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

+ Details

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

- Definition

Percentage of principal amount of debt redeemed.

+ References

No definition available.

+ Details

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

- Definition

Represents the charge against earnings during the period for commitment fees and debt issuance expenses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.8)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

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

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=lrcx_TwoPointSevenFivePercentSeniorNotesDueTwoThousandTwentyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=lrcx_ThreePointEightZeroPercentSeniorNotesDueTwoThousandTwentyFiveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=lrcx_TwoPointEightPercentSeniorNotesDueTwentyTwentyOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=lrcx_ThreePointFourFivePercentSeniorNotesDueTwentyTwentyThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=lrcx_ThreePointNinePercentSeniorNotesDueTwentyTwentySixMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=lrcx_Notesdue2023and2026Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Long Term Debt and Other Borrowings - Senior Notes Narrative (Detail) - Senior notes - USD ($)			3 Months Ended
	Jun. 07, 2016	Mar. 12, 2015	Dec. 25, 2016	Jun. 25, 2017	Oct. 05, 2016	Jun. 30, 2016	Mar. 31, 2015
Debt Instrument [Line Items]
Principal amount						$ 2,400,000,000	$ 1,000,000,000
2.75% Notes due 2020
Debt Instrument [Line Items]
Principal amount		$ 500,000,000
Interest rate percentage		2.75%		2.75%
Percentage of principal amount of debt redeemed		100.00%
Debt instrument, redemption price (percentage)		101.00%
3.80% Notes due 2025
Debt Instrument [Line Items]
Principal amount		$ 500,000,000
Interest rate percentage		3.80%		3.80%
Percentage of principal amount of debt redeemed		100.00%
Debt instrument, redemption price (percentage)		101.00%
2.80 Notes due 2021
Debt Instrument [Line Items]
Principal amount	$ 800,000,000
Interest rate percentage	2.80%			2.80%
Percentage of principal amount of debt redeemed	100.00%
Debt instrument, redemption price (percentage)	101.00%
3.45% Notes due 2023
Debt Instrument [Line Items]
Principal amount	$ 600,000,000
Interest rate percentage	3.45%			3.45%
Percentage of principal amount of debt redeemed	100.00%
Debt instrument, redemption price (percentage)	101.00%
3.90% Notes due 2026
Debt Instrument [Line Items]
Principal amount	$ 1,000,000,000
Interest rate percentage	3.90%			3.90%
Percentage of principal amount of debt redeemed	100.00%
Debt instrument, redemption price (percentage)	101.00%
Notes due 2023 and 2026
Debt Instrument [Line Items]
Accrued and unpaid interest					$ 21,000,000
Loan issuance costs			$ 2,500,000