    <SEC-DOCUMENT>0000929008-18-000009-index.html : 20180426
    <SEC-HEADER>0000929008-18-000009.hdr.sgml : 20180426
    <ACCEPTANCE-DATETIME>20180426060518
    ACCESSION NUMBER:		0000929008-18-000009
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		26
    CONFORMED PERIOD OF REPORT:	20180426
    ITEM INFORMATION:		Results of Operations and Financial Condition
    ITEM INFORMATION:		Regulation FD Disclosure
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20180426
    DATE AS OF CHANGE:		20180426

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			WESCO INTERNATIONAL INC
    		CENTRAL INDEX KEY:			0000929008
    		STANDARD INDUSTRIAL CLASSIFICATION:	WHOLESALE-ELECTRICAL APPARATUS & EQUIPMENT, WIRING SUPPLIES [5063]
    		IRS NUMBER:				251723342
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		8-K
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-14989
    		FILM NUMBER:		18775944

    	BUSINESS ADDRESS:
    		STREET 1:		225 WEST STATION SQUARE DRIVE
    		STREET 2:		STE 700
    		CITY:			PITTSBURGH
    		STATE:			PA
    		ZIP:			15219
    		BUSINESS PHONE:		4124542200

    	MAIL ADDRESS:
    		STREET 1:		225 WEST STATION SQUARE DRIVE
    		STREET 2:		STE 700
    		CITY:			PITTSBURGH
    		STATE:			PA
    		ZIP:			15219

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	CDW HOLDING CORP
    		DATE OF NAME CHANGE:	19971217
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>8-K
    <SEQUENCE>1
    <FILENAME>wcc-1q2018earnings8k.htm
    <DESCRIPTION>FORM 8-K
    <TEXT>
    Document 1 - file: wcc-1q2018earnings8k.htm

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    <DOCUMENT>
    <TYPE>EX-99.1
    <SEQUENCE>2
    <FILENAME>wcc-1q2018earningsrelease.htm
    <DESCRIPTION>NEWS RELEASE
    <TEXT>
    Document 2 - file: wcc-1q2018earningsrelease.htm

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    <TYPE>EX-99.2
    <SEQUENCE>3
    <FILENAME>wcc-1q2018webcastslides.htm
    <DESCRIPTION>SLIDE PRESENTATION
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