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Cover Page - USD ($)
 12 Months Ended
Dec. 28, 2019
Feb. 21, 2020
Jun. 29, 2019
Cover page.      
Document Type 10-K    
Document Annual Report true    
Entity File Number 1-6770    
Entity Address, Address Line One 150 Schilling Boulevard    
Entity Address, Address Line Two Suite 100    
Entity Address, City or Town Collierville    
Entity Address, State or Province TN    
Entity Registrant Name MUELLER INDUSTRIES, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 25-0790410    
Entity Address, Postal Zip Code 38017    
City Area Code 901    
Local Phone Number 753-3200    
Title of 12(b) Security Common Stock, $0.01 Par Value    
Trading Symbol MLI    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 1,597,828,319
Entity Common Stock, Shares Outstanding   56,995,167  
Document Transition Report false    
Entity Central Index Key 0000089439    
Current Fiscal Year End Date --12-28    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Amendment Flag false    
Document Period End Date Dec. 28, 2019    
Documents Incorporated by Reference
Portions of the following document are incorporated by reference into this Report: Registrant’s Definitive Proxy Statement for the 2020 Annual Meeting of Stockholders, scheduled to be mailed on or about March 26, 2020 (Part III).