Acquisitions and Dispositions - Narrative (Details) - USD ($) $ in Thousands			3 Months Ended		6 Months Ended
	Dec. 07, 2021	Jan. 29, 2021	Sep. 25, 2021	Jun. 26, 2021	Jun. 26, 2021	Jun. 25, 2022	Dec. 25, 2021	Oct. 25, 2021	Sep. 02, 2021	Jul. 28, 2021
Business Acquisition [Line Items]
Interest in the joint venture, ownership percentage									17.00%
Goodwill, net						$ 162,630	$ 171,330
Mueller Middle East | Corporate Joint Venture
Business Acquisition [Line Items]
Interest in the joint venture, ownership percentage	40.00%
Copper Bar | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Business Acquisition [Line Items]
Net sales of disposed of business				$ 13,400	$ 24,800
Disposal group, including discontinued operation, operating income (loss)				100	200
Consideration for sale of businesses								$ 10,100
Assets of disposed business								$ 3,600
Die-Mold | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Business Acquisition [Line Items]
Net sales of disposed of business				4,000	7,900
Net income of disposed business				800	1,400
Gain (loss) on disposal of businesses			$ 4,700
Consideration for sale of businesses									$ 22,800
Fabricated Tube Products and Shoals Tubular, Inc. | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Business Acquisition [Line Items]
Net sales of disposed of business				17,100	31,800
Net income of disposed business				$ 2,800	$ 5,000
Gain (loss) on disposal of businesses			$ 46,600
Consideration for sale of businesses										$ 75,700
Assets of disposed business										32,700
Liabilities of disposed business										$ 3,600
Mueller Middle East
Business Acquisition [Line Items]
Interest in the joint venture, ownership percentage	15.00%
Ownership interest acquired (as a percent)	55.00%
Consideration transferred net of working capital adjustments	$ 20,100
Cash portion of acquisition price	15,800
Debt assumed	2,600
Payment for contingent consideration	1,000
Equity interest issued or issuable	700
Fair value of assets acquired	44,800
Fair value of property, plant and equipment acquired	26,700
Fair value of accounts receivable acquired	10,700
Fair value of inventories acquired	4,700
Business combination, recognized identifiable assets acquired and liabilities assumed, current assets, other	2,700
Fair value of liabilities acquired	15,600
Fair value of other current liabilities acquired	11,000
Fair value of accounts payable acquired	4,600
Goodwill, net	6,300
Business combination, acquisition of less than 100 percent, noncontrolling interest, fair value	$ 15,400
Hart & Cooley Flexible Duct Business
Business Acquisition [Line Items]
Consideration transferred net of working capital adjustments		$ 15,300
Cash portion of acquisition price		14,000
Payment for contingent consideration		1,300
Fair value of assets acquired		15,300
Fair value of property, plant and equipment acquired		10,800
Fair value of inventories acquired		$ 4,500
Retail Distribution Business
Business Acquisition [Line Items]
Interest in the joint venture, ownership percentage									17.00%