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Stock Repurchase Program - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Sep. 27, 2015	Apr. 29, 2014
Stock Repurchase Program [Line Items]
Net shares of settlements to cover tax withholding obligations	208,624
Amount paid for shares under net share settlements	$ 15.3
Maximum
Stock Repurchase Program [Line Items]
Authorized repurchase of Company common stock		$ 850.0

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- Definition

Stock Repurchase Program [Line Items]

+ References

No definition available.

+ Details

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

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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.

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No definition available.

+ Details

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

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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.

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No definition available.

+ Details

Name:	us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

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- Definition

Amount of stock repurchase plan authorized.

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No definition available.

+ Details

Name:	us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

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Namespace Prefix:
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Period Type: