Document and Entity Information - USD ($)	12 Months Ended
	Dec. 30, 2017	Feb. 23, 2018	Jul. 01, 2017
Document and Entity Information [Abstract]
Entity Registrant Name	MUELLER INDUSTRIES INC
Entity Central Index Key	0000089439
Current Fiscal Year End Date	--12-30
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 1,698,272,608
Entity Common Stock, Shares Outstanding		57,564,175
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 30, 2017