Goodwill and Other Intangible Assets - Schedule of Changes in Carrying Amount of Goodwill (Details) - USD ($)	3 Months Ended	12 Months Ended
	Sep. 25, 2021	Dec. 30, 2023	Dec. 31, 2022	Dec. 25, 2021
Goodwill [Roll Forward]
Goodwill			$ 222,822,000
Accumulated impairment charges, beginning of year			(51,492,000)
Goodwill, net, beginning balance		$ 157,588,000	171,330,000
Reductions		(7,007,000)	(11,216,000)
Currency translation		1,239,000	(2,526,000)
Goodwill		203,312,000		$ 222,822,000
Accumulated impairment charges, end of year		(51,492,000)		(51,492,000)
Goodwill, net, ending balance		151,820,000	157,588,000	171,330,000
Impairment charges, excluding Turbotec		0	0	0
Impairment charges	$ 2,100,000
Mueller Middle East
Goodwill [Roll Forward]
Decrease in goodwill			(11,200,000)
Piping Systems
Goodwill [Roll Forward]
Goodwill			192,316,000
Accumulated impairment charges, beginning of year			(40,552,000)
Goodwill, net, beginning balance		138,022,000	151,764,000
Reductions		(7,007,000)	(11,216,000)
Currency translation		1,239,000	(2,526,000)
Goodwill		172,806,000		192,316,000
Accumulated impairment charges, end of year		(40,552,000)		(40,552,000)
Goodwill, net, ending balance		132,254,000	138,022,000	151,764,000
Industrial Metals
Goodwill [Roll Forward]
Goodwill			8,854,000
Accumulated impairment charges, beginning of year			(8,853,000)
Goodwill, net, beginning balance		1,000	1,000
Reductions		0	0
Currency translation		0	0
Goodwill		8,854,000		8,854,000
Accumulated impairment charges, end of year		(8,853,000)		(8,853,000)
Goodwill, net, ending balance		1,000	1,000	1,000
Climate
Goodwill [Roll Forward]
Goodwill			21,652,000
Accumulated impairment charges, beginning of year			(2,087,000)
Goodwill, net, beginning balance		19,565,000	19,565,000
Reductions		0	0
Currency translation		0	0
Goodwill		21,652,000		21,652,000
Accumulated impairment charges, end of year		(2,087,000)		(2,087,000)
Goodwill, net, ending balance		$ 19,565,000	$ 19,565,000	$ 19,565,000