Commitments (Contractual Cash Obligations And Commitments) (Details) (USD $) In Thousands	Jun. 26, 2011
Commitments
Purchase Obligations, One year	$ 192,766
Purchase Obligations, Two years	42,406
Purchase Obligations, Three years	24,318
Purchase Obligations, Four years	16,712
Purchase Obligations, Five years	13,043
Purchase Obligations, Over five years	1,040
Purchase Obligations, Total	$ 290,285

Commitments And Contingencies Disclosure [Abstract]

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The aggregate amount of payments due in the fifth year after the balance sheet date related to purchase obligation.

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The aggregate amount of payments due in the fifth year after the balance sheet date related to purchase obligation.

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The aggregate amount of payments due in the second year after the balance sheet date related to purchase obligation.

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Balance Type:	credit
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The aggregate amount of payments due in the third year after the balance sheet date related to purchase obligation.

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The aggregate amount of payments due in the first year after the balance sheet date related to purchase obligation.

Name:	lrcx_UnrecordedPurchaseObligationDueWithinOneYear
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Data Type:	xbrli:monetaryItemType
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The aggregate amount of payments due in the fourth year after the balance sheet date related to purchase obligation.

Name:	lrcx_UnrecordedPurchaseObligationsDueInFourthYear
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Period Type:	instant

The aggregate amount of payments due related to unconditional purchase obligations.

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