Document and Entity Information
6 Months Ended
Dec. 26, 2010
Jan. 28, 2011
Document and Entity Information    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Dec. 26, 2010  
Document Fiscal Year Focus 2011  
Document Fiscal Period Focus Q2  
Trading Symbol LRCX  
Entity Registrant Name LAM RESEARCH CORP  
Entity Central Index Key 0000707549  
Current Fiscal Year End Date --06-26  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   123,549,931