Maximum additional incremental interest (illustrated in annual percentage rate) that could, contingent upon certain circumstances noted in the referenced debt agreement, be payable upon the outstanding principal on said note.

No definition available.

+ Details

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

- 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

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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

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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

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

- Details

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Namespace Prefix:
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- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_ConvertibleDebtMember
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- Details

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- Details

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- Details

Name:	us-gaap_DebtConversionByUniqueDescriptionAxis=lrcx_ConversionofNinetyNineTwentySixteenNotesMember
Namespace Prefix:
Data Type:	na
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- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
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Long Term Debt and Other Borrowings - Convertible Senior Notes Narrative (Detail) - USD ($)	1 Months Ended
	Jun. 30, 2012	Sep. 24, 2017	Jun. 25, 2017	May 31, 2011
1.25% Notes due 2018
Debt Instrument [Line Items]
Principal amount				$ 450,000,000
Convertible debt \| 1.25% Notes due 2018
Debt Instrument [Line Items]
Principal amount				$ 450,000,000
Interest rate percentage			1.25%	1.25%
Convertible debt \| 2.625% Notes due 2041
Debt Instrument [Line Items]
Principal amount	$ 700,000,000
Interest rate percentage	2.625%		2.625%
Maximum amount of contingent interest rate	0.60%
Convertible debt \| 0.50% Notes due 2016
Debt Instrument [Line Items]
Interest rate percentage			0.50%
Convertible debt \| 0.50% Notes due 2016 \| Conversion of 99, 2016 Notes
Debt Instrument [Line Items]
Principal amount			$ 71,300,000
Convertible debt \| 0.50% Notes due 2016 \| Conversion of 99, 2016 Notes \| Subsequent event
Debt Instrument [Line Items]
Principal amount		$ 301,700,000