    <SEC-DOCUMENT>0000319201-18-000010-index.html : 20180202
    <SEC-HEADER>0000319201-18-000010.hdr.sgml : 20180202
    <ACCEPTANCE-DATETIME>20180201184022
    ACCESSION NUMBER:		0000319201-18-000010
    CONFORMED SUBMISSION TYPE:	S-3ASR
    PUBLIC DOCUMENT COUNT:		6
    FILED AS OF DATE:		20180202
    DATE AS OF CHANGE:		20180201
    EFFECTIVENESS DATE:		20180202

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			KLA TENCOR CORP
    		CENTRAL INDEX KEY:			0000319201
    		STANDARD INDUSTRIAL CLASSIFICATION:	OPTICAL INSTRUMENTS & LENSES [3827]
    		IRS NUMBER:				042564110
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			0630

    	FILING VALUES:
    		FORM TYPE:		S-3ASR
    		SEC ACT:		1933 Act
    		SEC FILE NUMBER:	333-222827
    		FILM NUMBER:		18568141

    	BUSINESS ADDRESS:
    		STREET 1:		ONE TECHNOLOGY DRIVE
    		CITY:			MILPITAS
    		STATE:			CA
    		ZIP:			95035
    		BUSINESS PHONE:		4088756000

    	MAIL ADDRESS:
    		STREET 1:		ONE TECHNOLOGY DRIVE
    		CITY:			MILPITAS
    		STATE:			CA
    		ZIP:			95035

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	KLA INSTRUMENTS CORP
    		DATE OF NAME CHANGE:	19920703
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>S-3ASR
    <SEQUENCE>1
    <FILENAME>forms-3asr2018.htm
    <DESCRIPTION>S-3ASR
    <TEXT>
    Document 1 - file: forms-3asr2018.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-5.1
    <SEQUENCE>2
    <FILENAME>wsgropinionforms-3asr.htm
    <DESCRIPTION>EXHIBIT 5.1
    <TEXT>
    Document 2 - file: wsgropinionforms-3asr.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-13.1
    <SEQUENCE>3
    <FILENAME>ratioofearningstofixedchar.htm
    <DESCRIPTION>EXHIBIT 13.1
    <TEXT>
    Document 3 - file: ratioofearningstofixedchar.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-23.1
    <SEQUENCE>4
    <FILENAME>pwcconsents-3asr.htm
    <DESCRIPTION>EXHIBIT 23.1
    <TEXT>
    Document 4 - file: pwcconsents-3asr.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-25.1
    <SEQUENCE>5
    <FILENAME>wellsfargot-1.htm
    <DESCRIPTION>EXHIBIT 25.1
    <TEXT>
    Document 5 - file: wellsfargot-1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>colorlogojpeg.jpg
    <TEXT>
    Document 6 - file: colorlogojpeg.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>