BASIS OF PRESENTATION (Policies)	3 Months Ended
Sep. 26, 2021
Accounting Policies [Abstract]
Consolidation	The condensed consolidated financial statements include the accounts of Lam Research and its wholly-owned subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation.
Fiscal Period	The Company’s reporting period is a 52/53-week fiscal year. The Company’s current fiscal year will end June 26, 2022 and includes 52 weeks.
Recent Accounting Pronouncements	Recently Adopted The Company did not adopt any new accounting standards during the first quarter of fiscal year 2022 that had a material impact on the Company’s Condensed Consolidated Financial Statements. Updates Not Yet Adopted or Effective There are no new accounting pronouncements not yet adopted or effective that are expected to have a material impact on the Company’s Condensed Consolidated Financial Statements.
Inventories	Inventories are stated at the lower of cost (first-in, first-out method) or net realizable value. System shipments to customers in Japan, for which title does not transfer until customer acceptance, are classified as finished goods inventory and carried at cost until title transfers.
Warranties	The Company provides standard warranties on its systems. The liability amount is based on actual historical warranty spending activity by type of system, customer, and geographic region, modified for any known differences such as the impact of system reliability improvements.

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Disclosure of accounting policy for subsidiaries or other investments that are consolidated, including the accounting treatment for intercompany accounts or transactions and any noncontrolling interest.

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