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Components of Other Expense, Net - Additional Information (Detail) (Novellus Systems Incorporated, USD $) In Millions, unless otherwise specified	6 Months Ended
	Dec. 28, 2014
Novellus Systems Incorporated
Component Of Other Expense Income Nonoperating [Line Items]
Net pre-tax gain associated with divestiture	$ 7.3us-gaap_OtherExpenses / us-gaap_BusinessAcquisitionAxis = lrcx_NovellusSystemsIncorporatedMember

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- Details

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

X

- Definition

This element represents a sum total of expenses not separately reflected on the income statement for the period.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 7

-Article 7



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-04.7)

-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.4,6)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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