Annual report pursuant to Section 13 and 15(d)

DEI Document

DEI Document (USD $)
In Billions, except Share data, unless otherwise specified
12 Months Ended
Jun. 30, 2014
Jul. 17, 2014
Dec. 31, 2013
Entity Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Jun. 30, 2014    
Document Fiscal Year Focus 2014    
Document Fiscal Period Focus FY    
Entity Registrant Name KLA TENCOR CORP    
Entity Central Index Key 0000319201    
Entity Filer Category Large Accelerated Filer    
Current Fiscal Year End Date --06-30    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Well-known Seasoned Issuer Yes    
Trading Symbol klac    
Entity Common Stock, Shares Outstanding   165,368,152  
Entity Public Float     $ 10.7