    <SEC-DOCUMENT>0001193125-18-287447-index.html : 20180928
    <SEC-HEADER>0001193125-18-287447.hdr.sgml : 20180928
    <ACCEPTANCE-DATETIME>20180928161607
    ACCESSION NUMBER:		0001193125-18-287447
    CONFORMED SUBMISSION TYPE:	DEF 14A
    PUBLIC DOCUMENT COUNT:		7
    CONFORMED PERIOD OF REPORT:	20181107
    FILED AS OF DATE:		20180928
    DATE AS OF CHANGE:		20180928
    EFFECTIVENESS DATE:		20180928

    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:		DEF 14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	000-09992
    		FILM NUMBER:		181094354

    	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>DEF 14A
    <SEQUENCE>1
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    <DESCRIPTION>DEF 14A
    <TEXT>
    Document 1 - file: d604315ddef14a.htm

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    <DESCRIPTION>GRAPHIC
    <TEXT>
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    <FILENAME>g604315g62b92.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 3 - file: g604315g62b92.jpg

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    <SEQUENCE>4
    <FILENAME>g604315g87w32.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 4 - file: g604315g87w32.jpg

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    <DESCRIPTION>GRAPHIC
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    <SEQUENCE>6
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    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 6 - file: g604315page001.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
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    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 7 - file: g604315page002.jpg

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