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Stock Repurchase Program - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended | 0 Months Ended |
--- | --- | --- | --- | ---
Dec. 28, 2014 | Sep. 28, 2014 | Dec. 28, 2014 | Dec. 29, 2013 | Oct. 09, 2014 | Apr. 29, 2014
Stock Repurchase Program [Line Items] |  |  |  |  |  |  |  |
Net shares of settlements to cover tax withholding obligations |  |  |  |  | 409,418 us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation |  |  |
Amount paid for shares under net share settlements |  |  |  |  | $ 31,300,000 us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation |  |  |
Treasury stock purchases |  |  |  |  | 373,958,000 us-gaap_PaymentsForRepurchaseOfCommonStock | 152,195,000 us-gaap_PaymentsForRepurchaseOfCommonStock |  |
Total Number of Shares Repurchased | 869,000 us-gaap_TreasuryStockSharesAcquired |  | 3,818,000 us-gaap_TreasuryStockSharesAcquired |  |  |  |  |
Treasury stock purchases, weighted average share price | $ 77.31 us-gaap_TreasuryStockAcquiredAverageCostPerShare | [1] | $ 70.01 us-gaap_TreasuryStockAcquiredAverageCostPerShare | [1] |  |  |  |
Treasury stock, at cost | 250,000,000 us-gaap_TreasuryStockCarryingBasis |  |  |  | 250,000,000 us-gaap_TreasuryStockCarryingBasis |  |  |
Repurchase Of Equity | Maximum |  |  |  |  |  |  |  |
Stock Repurchase Program [Line Items] |  |  |  |  |  |  |  |
Authorized repurchase of Company common stock |  |  |  |  |  |  |  | 850,000,000 us-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 |  |  | $ 250,000,000 us-gaap_PaymentsForRepurchaseOfCommonStock / lrcx_ScheduleOfShareRepurchaseProgramsAxis = lrcx_ShareRepurchaseProgramMember |  |  |  |  |
Total Number of Shares Repurchased |  |  |  |  |  |  | 300,000 us-gaap_TreasuryStockSharesAcquired / lrcx_ScheduleOfShareRepurchaseProgramsAxis = lrcx_ShareRepurchaseProgramMember |
Treasury stock purchases, weighted average share price |  |  |  |  |  |  | $ 72.90 us-gaap_TreasuryStockAcquiredAverageCostPerShare / lrcx_ScheduleOfShareRepurchaseProgramsAxis = lrcx_ShareRepurchaseProgramMember |
Share Repurchase Program Final Settlement | Initial delivery |  |  |  |  |  |  |  |
Stock Repurchase Program [Line Items] |  |  |  |  |  |  |  |
Total Number of Shares Repurchased |  |  | 3,200,000 us-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 Collared Accelerated Share Repurchase section below for details regarding average price associated with these transactions.

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- Definition 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. + References No definition available. + Details
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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 + Details
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- Definition 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. + References No definition available. + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition 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 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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- Definition Cost basis for treasury stock acquired for purposes other than retirement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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- Definition 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 -Article 5 + Details
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