    <SEC-DOCUMENT>0000089439-20-000023-index.html : 20200421
    <SEC-HEADER>0000089439-20-000023.hdr.sgml : 20200421
    <ACCEPTANCE-DATETIME>20200421162121
    ACCESSION NUMBER:		0000089439-20-000023
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		4
    CONFORMED PERIOD OF REPORT:	20200421
    ITEM INFORMATION:		Results of Operations and Financial Condition
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20200421
    DATE AS OF CHANGE:		20200421

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			MUELLER INDUSTRIES INC
    		CENTRAL INDEX KEY:			0000089439
    		STANDARD INDUSTRIAL CLASSIFICATION:	ROLLING DRAWING & EXTRUDING OF NONFERROUS METALS [3350]
    		IRS NUMBER:				250790410
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1228

    	FILING VALUES:
    		FORM TYPE:		8-K
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-06770
    		FILM NUMBER:		20805398

    	BUSINESS ADDRESS:
    		STREET 1:		SUITE 100
    		STREET 2:		150 SCHILLING BOULEVARD
    		CITY:			COLLIERVILLE
    		STATE:			TN
    		ZIP:			38017
    		BUSINESS PHONE:		(901)753-3200

    	MAIL ADDRESS:
    		STREET 1:		SUITE 100
    		STREET 2:		150 SCHILLING BOULEVARD
    		CITY:			COLLIERVILLE
    		STATE:			TN
    		ZIP:			38017

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	SHARON STEEL CORP
    		DATE OF NAME CHANGE:	19910103
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>8-K
    <SEQUENCE>1
    <FILENAME>mli-032820x8k.htm
    <DESCRIPTION>8-K
    <TEXT>
    Document 1 - file: mli-032820x8k.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99
    <SEQUENCE>2
    <FILENAME>exhibit991q12020earningsre.htm
    <DESCRIPTION>EXHIBIT 99
    <TEXT>
    Document 2 - file: exhibit991q12020earningsre.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>mlihorzpms7516ca04.jpg
    <TEXT>
    Document 3 - file: mlihorzpms7516ca04.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>muellerlogoa07.jpg
    <TEXT>
    Document 4 - file: muellerlogoa07.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>