CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated other comprehensive loss	Treasury Stock	Noncontrolling Interest
Balance at beginning of period at Dec. 28, 2024		$ 1,604	$ 330,532	$ 3,107,838	$ (80,279)	$ (586,530)	$ 31,243
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options, net of shares withheld			763
Stock-based compensation expense			6,150
Issuance of restricted stock			0			(5,967)
Net income attributable to Mueller Industries, Inc.	$ 157,432			157,432
Dividends paid or payable to stockholders of Mueller Industries, Inc.				(27,643)
Total other comprehensive (loss) income attributable to Mueller Industries, Inc.	4,646				5,442
Issuance of shares under incentive stock plans						710
Repurchase of common stock						(243,615)
Shares withheld for stock option exercises and employee taxes			0			(5,967)
Transactions with noncontrolling interests			0				600
Dividends paid to noncontrolling interests							(12,240)
Net income attributable to noncontrolling interests	(1,855)						1,855
Foreign currency translation	2,919						(796)
Balance at end of period at Mar. 29, 2025		1,604	337,445	3,237,627	(74,837)	(835,402)	20,662
Balance at beginning of period at Dec. 27, 2025	3,235,906	1,604	345,033	3,761,575	(50,835)	(847,411)	25,940
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options, net of shares withheld			(10)
Stock-based compensation expense			7,332
Issuance of restricted stock			(52)			(1,309)
Net income attributable to Mueller Industries, Inc.	239,018			239,018
Dividends paid or payable to stockholders of Mueller Industries, Inc.				(38,685)
Total other comprehensive (loss) income attributable to Mueller Industries, Inc.	(8,085)				(8,085)
Issuance of shares under incentive stock plans						837
Repurchase of common stock						(74,981)
Shares withheld for stock option exercises and employee taxes			(52)			(1,309)
Transactions with noncontrolling interests			420				2,680
Dividends paid to noncontrolling interests							(4,766)
Net income attributable to noncontrolling interests	(2,371)						2,371
Foreign currency translation	(5,910)						156
Balance at end of period at Mar. 28, 2026	$ 3,360,832	$ 1,604	$ 352,723	$ 3,961,908	$ (58,920)	$ (922,864)	$ 26,381