Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

v2.4.0.6
Document and Entity Information
9 Months Ended
Mar. 31, 2012
Apr. 12, 2012
Entity Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 2012  
Document Fiscal Year Focus 2012  
Document Fiscal Period Focus Q3  
Entity Registrant Name KLA TENCOR CORP  
Entity Central Index Key 0000319201  
Entity Filer Category Large Accelerated Filer  
Current Fiscal Year End Date --06-30  
Trading Symbol klac  
Entity Common Stock, Shares Outstanding   167,327,833