CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 27, 2025	Dec. 28, 2024	Dec. 30, 2023
Statement of Comprehensive Income [Abstract]
Consolidated net income	$ 773,590	$ 617,542	$ 609,649
Other comprehensive income (loss), net of tax:
Foreign currency translation	23,847	(30,541)	21,943
Net change with respect to derivative instruments and hedging activities, net of tax of $(549), $117, and $373	1,885	(404)	(1,273)
Net change in pension and postretirement obligation adjustments, net of tax of $(961), $1,235, and $1,308	2,987	(3,652)	(3,852)
Attributable to unconsolidated affiliates, net of tax of $(211), $334, and $(266)	725	(1,152)	917
Total other comprehensive income (loss), net	29,444	(35,749)	17,735
Consolidated comprehensive income	803,034	581,793	627,384
Comprehensive income attributable to noncontrolling interests	(6,337)	(9,972)	(7,533)
Comprehensive income attributable to Mueller Industries, Inc.	$ 796,697	$ 571,821	$ 619,851