    <SEC-DOCUMENT>0000929008-19-000027-index.html : 20191001
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    <ACCEPTANCE-DATETIME>20190930174546
    ACCESSION NUMBER:		0000929008-19-000027
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		17
    CONFORMED PERIOD OF REPORT:	20190930
    ITEM INFORMATION:		Entry into a Material Definitive Agreement
    ITEM INFORMATION:		Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20191001

    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:		191127036

    	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>
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    <TYPE>8-K
    <SEQUENCE>1
    <FILENAME>wcc-8kamendedcredit.htm
    <DESCRIPTION>8-K
    <TEXT>
    Document 1 - file: wcc-8kamendedcredit.htm

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    <TYPE>EX-10.1
    <SEQUENCE>2
    <FILENAME>wcc-ex101creditagree.htm
    <DESCRIPTION>EXHIBIT 10.1
    <TEXT>
    Document 2 - file: wcc-ex101creditagree.htm

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    <DESCRIPTION>EXHIBIT 10.2
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    <FILENAME>wcc-20190930.xsd
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    <FILENAME>wcc-20190930_cal.xml
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    <SEQUENCE>13
    <FILENAME>Financial_Report.xlsx
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    <TEXT>
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    <TYPE>JSON
    <SEQUENCE>14
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    <FILENAME>R1.htm
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