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Stock Repurchase Program - Additional Information (Detail) (USD $)	3 Months Ended						9 Months Ended		0 Months Ended
	Mar. 29, 2015		Dec. 28, 2014		Sep. 28, 2014		Mar. 29, 2015	Mar. 30, 2014	Oct. 09, 2014	Apr. 29, 2014
Stock Repurchase Program [Line Items]
Net shares of settlements to cover tax withholding obligations	115,785us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation						525,203us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
Amount paid for shares under net share settlements	$ 9,300,000us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation						$ 40,600,000us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
Treasury stock purchases							498,901,000us-gaap_PaymentsForRepurchaseOfCommonStock	204,610,000us-gaap_PaymentsForRepurchaseOfCommonStock
Total Number of Shares Repurchased	1,434,000us-gaap_TreasuryStockSharesAcquired		869,000us-gaap_TreasuryStockSharesAcquired		3,818,000us-gaap_TreasuryStockSharesAcquired
Treasury stock purchases, weighted average share price	$ 78.45us-gaap_TreasuryStockAcquiredAverageCostPerShare	[1]	$ 77.31us-gaap_TreasuryStockAcquiredAverageCostPerShare	[1]	$ 70.01us-gaap_TreasuryStockAcquiredAverageCostPerShare	[1]
Treasury stock, at cost	250,000,000us-gaap_TreasuryStockCarryingBasis						250,000,000us-gaap_TreasuryStockCarryingBasis
Repurchase Of Equity | Maximum
Stock Repurchase Program [Line Items]
Authorized repurchase of Company common stock										850,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_RangeAxis = us-gaap_MaximumMember / lrcx_StockRepurchasesAxis = lrcx_RepurchaseOfEquityUnitsMember
Share Repurchase Program Final Settlement
Stock Repurchase Program [Line Items]
Treasury stock purchases					$ 250,000,000us-gaap_PaymentsForRepurchaseOfCommonStock / lrcx_ScheduleOfShareRepurchaseProgramsAxis = lrcx_ShareRepurchaseProgramMember
Total Number of Shares Repurchased									300,000us-gaap_TreasuryStockSharesAcquired / lrcx_ScheduleOfShareRepurchaseProgramsAxis = lrcx_ShareRepurchaseProgramMember
Treasury stock purchases, weighted average share price									$ 72.90us-gaap_TreasuryStockAcquiredAverageCostPerShare / lrcx_ScheduleOfShareRepurchaseProgramsAxis = lrcx_ShareRepurchaseProgramMember
Share Repurchase Program Final Settlement | Initial delivery
Stock Repurchase Program [Line Items]
Total Number of Shares Repurchased					3,200,000us-gaap_TreasuryStockSharesAcquired / lrcx_ScheduleOfShareRepurchaseProgramsAxis = lrcx_ShareRepurchaseProgramMember / us-gaap_ShareRepurchaseProgramAxis = lrcx_InitialAllocationMember
[1] Average price paid per share excludes accelerated share repurchases for which cost was incurred during the September 2014 quarter, but that did not settle until the December 2014 quarter. See section below for details regarding average price associated with these transactions.

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The amount of adjustment to stockholders' equity associated with an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

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- Definition

The cash outflow to reacquire common stock during the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

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Amount of stock repurchase plan authorized.

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Total cost of shares repurchased divided by the total number of shares repurchased.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 30

-Section 45

-Paragraph 1

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Cost basis for treasury stock acquired for purposes other than retirement.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 30

-Section 45

-Paragraph 1

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Number of shares that have been repurchased during the period and are being held in treasury.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: 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=6928386&loc=d3e21463-112644



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

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