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Consideration Transferred to Acquire Novellus (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 1 Months Ended
Jun. 04, 2012
Business Acquisition, Equity Interests Issued or Issuable [Line Items]  
Lam common stock issued at merger 82,689
Per share price of Lam common stock as of June 4, 2012 $ 35.99
Novellus Systems Incorporated
  
Business Acquisition, Equity Interests Issued or Issuable [Line Items]  
Estimated purchase price consideration $ 3,026,988
Novellus Systems Incorporated | Common Stock
  
Business Acquisition, Equity Interests Issued or Issuable [Line Items]  
Estimated fair value of Lam equivalent equity 2,975,977
Novellus Systems Incorporated | Restricted Stock Units
  
Business Acquisition, Equity Interests Issued or Issuable [Line Items]  
Estimated fair value of Lam equivalent equity 9,599 [1]
Novellus Systems Incorporated | Stock Option
  
Business Acquisition, Equity Interests Issued or Issuable [Line Items]  
Estimated fair value of Lam equivalent equity $ 41,412 [2]
[1] The fair value of Lam Research equivalent restricted stock as of the acquisition date was estimated based upon the per share price of Lam Research common stock as of June 4, 2012, and giving effect to the exchange ratio of 1.125.
[2] The fair value of the Lam Research equivalent stock options as of the acquisition date was estimated using the Black-Scholes valuation model. Assumptions used are the same as those for acquired awards as disclosed in Note 11 of Notes to Consolidated Financial Statements.