Mueller Industries (MLI) 10-K 26 Feb 25 2024 FY Annual report Financial data

Cover

Cover - USD ($)	12 Months Ended
	Dec. 28, 2024	Feb. 19, 2025	Jun. 29, 2024
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 28, 2024
Current Fiscal Year End Date	--12-28
Document Transition Report	false
Entity File Number	1-6770
Entity Registrant Name	MUELLER INDUSTRIES, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	25-0790410
Entity Address, Address Line One	150 Schilling Boulevard
Entity Address, Address Line Two	Suite 100
Entity Address, City or Town	Collierville
Entity Address, State or Province	TN
Entity Address, Postal Zip Code	38017
City Area Code	901
Local Phone Number	753-3200
Title of 12(b) Security	Common Stock, $0.01 Par Value
Trading Symbol	MLI
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 6,322,607,148
Entity Common Stock, Shares Outstanding		113,267,514
Documents Incorporated by Reference	Portions of the following document are incorporated by reference into this Report: Registrant’s Definitive Proxy Statement for the 2025 Annual Meeting of Stockholders, scheduled to be mailed on or about March 27, 2025 (Part III).
Entity Central Index Key	0000089439
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	FY
Amendment Flag	false

Audit Information

Audit Information	12 Months Ended
	Dec. 28, 2024
Audit Information [Abstract]
Auditor Name	Ernst & Young LLP
Auditor Location	Memphis, Tennessee
Auditor Firm ID	42

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Income Statement [Abstract]
Net sales	$ 3,768,766	$ 3,420,345	$ 3,982,455
Cost of goods sold	2,724,328	2,433,511	2,864,862
Depreciation and amortization	53,133	39,954	43,731
Selling, general, and administrative expense	226,696	208,172	203,086
Gain on sale of businesses	0	(4,137)	0
Gain on sale of assets, net	(5,780)	0	(6,373)
Impairment charges	0	6,258	0
Gain on insurance settlement	0	(19,466)	0
Operating income	770,389	756,053	877,149
Interest expense	(410)	(1,221)	(810)
Interest income	53,468	38,208	6,457
Realized and unrealized gains on short-term investments	914	41,865	2,918
Gain on extinguishment of NMTC liability	1,265	7,534	0
Environmental expense	(2,218)	(825)	(1,298)
Pension plan termination expense	0	0	(13,100)
Other (expense) income, net	(2,946)	3,618	4,715
Income before income taxes	820,462	845,232	876,031
Income tax expense	(205,076)	(220,762)	(223,322)
Income (loss) from unconsolidated affiliates, net of foreign tax	2,156	(14,821)	10,111
Consolidated net income	617,542	609,649	662,820
Net income attributable to noncontrolling interests	(12,663)	(6,752)	(4,504)
Net income attributable to Mueller Industries, Inc.	$ 604,879	$ 602,897	$ 658,316
Weighted average shares for basic earnings per share (in shares)	111,385	111,420	111,558
Effect of dilutive stock-based awards (in shares)	2,580	2,242	1,552
Adjusted weighted average shares for diluted earnings per share (in shares)	113,965	113,662	113,110
Basic earnings per share (in dollars per share)	$ 5.43	$ 5.41	$ 5.90
Diluted earnings per share (in dollars per share)	5.31	5.30	5.82
Dividends per share (in dollars per share)	$ 0.80	$ 0.60	$ 0.50

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Consolidated net income	$ 617,542	$ 609,649	$ 662,820
Other comprehensive (loss) income, net of tax:
Foreign currency translation	(30,541)	21,943	(30,382)
Net change with respect to derivative instruments and hedging activities, net of tax of $117, $373, and $(200)	(404)	(1,273)	683
Net change in pension and postretirement obligation adjustments, net of tax of $1,235, $1,308, and $(4,381)	(3,652)	(3,852)	12,722
Attributable to unconsolidated affiliates, net of tax of $334, $(266), and $(784)	(1,152)	917	2,702
Total other comprehensive (loss) income, net	(35,749)	17,735	(14,275)
Consolidated comprehensive income	581,793	627,384	648,545
Comprehensive income attributable to noncontrolling interests	(9,972)	(7,533)	(1,057)
Comprehensive income attributable to Mueller Industries, Inc.	$ 571,821	$ 619,851	$ 647,488

CONSOLIDATED STATEMENTS OF CO_2

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net change with respect to derivative instruments and hedging activities, net of tax	$ 117	$ 373	$ (200)
Net change in pension and postretirement obligation adjustments, net of tax	1,235	1,308	(4,381)
Attributable to unconsolidated affiliates, net of tax	$ 334	$ (266)	$ (784)

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 28, 2024	Dec. 30, 2023
Current assets:
Cash and cash equivalents	$ 1,037,229	$ 1,170,893
Short-term investments	21,874	98,146
Accounts receivable, less allowance for doubtful accounts of $3,724 in 2024 and $2,830 in 2023	450,113	351,561
Inventories	462,279	380,248
Other current assets	40,734	39,173
Total current assets	2,012,229	2,040,021
Property, plant, and equipment, net	515,131	385,165
Operating lease right-of-use assets	32,702	35,170
Goodwill, net	311,165	151,820
Intangible assets, net	306,357	46,208
Investment in unconsolidated affiliates	88,037	83,436
Other noncurrent assets	25,285	17,481
Total Assets	3,290,906	2,759,301
Current liabilities:
Current portion of debt	1,094	796
Accounts payable	173,743	120,485
Accrued wages and other employee costs	60,136	55,644
Current portion of operating lease liabilities	8,117	7,893
Other current liabilities	154,897	132,320
Total current liabilities	397,987	317,138
Long-term debt, less current portion	0	185
Pension liabilities	3,059	2,832
Postretirement benefits other than pensions	8,140	9,230
Environmental reserves	15,423	15,030
Deferred income taxes	25,742	19,134
Noncurrent operating lease liabilities	24,547	26,683
Other noncurrent liabilities	11,600	10,353
Total liabilities	486,498	400,585
Mueller Industries, Inc. stockholders' equity:
Preferred stock - $1.00 par value; shares authorized 5,000,000; none outstanding	0	0
Common stock - $.01 par value; shares authorized 250,000,000; issued 160,366,008; outstanding 113,751,127 in 2024 and 114,157,918 in 2023	1,604	1,604
Additional paid-in capital	330,532	312,171
Retained earnings	3,107,838	2,594,300
Accumulated other comprehensive loss	(80,279)	(47,221)
Treasury common stock, at cost	(586,530)	(523,409)
Total Mueller Industries, Inc. stockholders' equity	2,773,165	2,337,445
Noncontrolling interests	31,243	21,271
Total equity	2,804,408	2,358,716
Commitments and contingencies	0	0
Total Liabilities and Equity	$ 3,290,906	$ 2,759,301

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 28, 2024	Dec. 30, 2023
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 3,724	$ 2,830
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, authorized (in shares)	5,000,000	5,000,000
Preferred stock, outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized (in shares)	250,000,000	250,000,000
Common stock, issued (in shares)	160,366,008	160,366,008
Common stock, outstanding (in shares)	113,751,127	114,157,918

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Operating activities:
Consolidated net income	$ 617,542	$ 609,649	$ 662,820
Reconciliation of consolidated net income to net cash provided by operating activities:
Depreciation	39,200	34,949	38,157
Amortization of intangibles	13,933	5,005	5,574
Amortization of debt issuance costs	243	870	357
(Income) loss from unconsolidated affiliates	(2,156)	14,821	(10,111)
Dividends from unconsolidated affiliates	4,769	0	0
Insurance proceeds - noncapital related	18,900	9,854	1,646
Gain on sale of securities	(365)	(17,100)	0
Gain on insurance settlement	0	(19,466)	0
Stock-based compensation expense	26,787	23,131	17,801
Provision for doubtful accounts receivable	1,147	(84)	323
Gain on disposals of assets	(5,780)	(1)	(6,373)
Gain on sale of businesses	0	(4,137)	0
Unrealized gain on short-term investments	(549)	(24,765)	0
Impairment charges	0	6,258	0
Gain on extinguishment of NMTC liability	(1,265)	(7,534)	0
Deferred income tax (benefit) expense	(867)	4,790	(3,880)
Changes in assets and liabilities, net of effects of businesses acquired:
Receivables	(56,565)	30,915	82,713
Inventories	(32,768)	67,903	(24,189)
Other assets	(1,046)	(20,700)	(8,971)
Current liabilities	24,360	(40,606)	(26,633)
Other liabilities	(1,145)	(3,497)	(7,564)
Other, net	1,533	2,511	2,273
Net cash provided by operating activities	645,908	672,766	723,943
Investing activities:
Proceeds from sale of assets, net of cash transferred	12,005	279	7,850
Purchase of short-term investments	(21,325)	(106,231)	(217,863)
Purchase of long-term investments	(6,785)	0	0
Acquisition of businesses, net of cash acquired	(602,692)	0	0
Capital expenditures	(80,203)	(54,025)	(37,639)
Issuance of notes receivable with unconsolidated affiliates	(3,800)	0	0
Insurance proceeds - capital related	6,100	24,646	3,354
Proceeds from the sale of securities	98,465	55,454	0
Proceeds from the maturity of short-term investments	0	217,863	0
Dividends from unconsolidated affiliates	0	1,093	2,295
Investments in unconsolidated affiliates	(8,700)	(3,999)	0
Net cash (used in) provided by investing activities	(606,935)	135,080	(242,003)
Financing activities:
Dividends paid to stockholders of Mueller Industries, Inc.	(89,107)	(66,868)	(55,787)
Dividends paid to noncontrolling interests	0	(9,312)	(7,248)
Repayments of long-term debt	(222)	(241)	(204)
Issuance (repayment) of debt by consolidated joint ventures, net	397	(30)	67
Repurchase of common stock	(48,681)	(19,303)	(38,054)
Net cash used to settle stock-based awards	(22,865)	(8,755)	(1,429)
Net cash used in financing activities	(160,478)	(104,509)	(102,655)
Effect of exchange rate changes on cash	(13,823)	5,590	(4,365)
(Decrease) increase in cash, cash equivalents, and restricted cash	(135,328)	708,927	374,920
Cash, cash equivalents, and restricted cash at the beginning of the year	1,174,223	465,296	90,376
Cash, cash equivalents, and restricted cash at the end of the year	$ 1,038,895	$ 1,174,223	$ 465,296

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Total	Common stock	Additional paid-in capital	Retained earnings	Accumulated other comprehensive loss	Treasury stock	Noncontrolling interests
Common Stock, Shares, Outstanding, Beginning Balance at Dec. 25, 2021		160,366,000
Balance at beginning of year at Dec. 25, 2021		$ 802	$ 286,208	$ 1,458,489	$ (53,347)	$ (470,034)	$ 34,845
Treasury stock beginning balance (in shares) at Dec. 25, 2021						45,774,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares under two-for-one stock split (in shares)		0
Issuance of shares under two-for-one stock split		$ 0	0
Acquisition of shares under incentive stock option plans			830			$ (2,260)
Stock-based compensation expense			17,801
Issuance of restricted stock			(7,569)			$ 7,569
Net income attributable to Mueller Industries, Inc.	$ 658,316			658,316
Dividends paid or payable to stockholders of Mueller Industries, Inc.				(57,009)
Total other comprehensive (loss) income attributable to Mueller Industries, Inc.	(14,275)				(10,828)
Issuance of shares under incentive stock option plans (in shares)						(153,000)
Repurchase of common stock (in shares)						1,438,000
Repurchase of common stock						$ (38,054)
Issuance of restricted stock (in shares)						(696,000)
Purchase of Mueller Middle East							(5,604)
Dividends paid to noncontrolling interests							(7,248)
Net income attributable to noncontrolling interests	(4,504)						4,504
Foreign currency translation	(30,382)						(3,447)
Common Stock, Shares, Outstanding, Ending Balance at Dec. 31, 2022		160,366,000
Treasury stock ending balance (in shares) at Dec. 31, 2022						46,363,000
Balance at end of year at Dec. 31, 2022		$ 802	297,270	2,059,796	(64,175)	$ (502,779)	23,050
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares under two-for-one stock split (in shares)		0
Issuance of shares under two-for-one stock split		$ 802	(802)
Acquisition of shares under incentive stock option plans			786			(9,541)
Stock-based compensation expense			23,131
Issuance of restricted stock			(8,214)			$ 8,214
Net income attributable to Mueller Industries, Inc.	602,897			602,897
Dividends paid or payable to stockholders of Mueller Industries, Inc.				(68,393)
Total other comprehensive (loss) income attributable to Mueller Industries, Inc.	17,735				16,954
Issuance of shares under incentive stock option plans (in shares)						57,000
Repurchase of common stock (in shares)						516,000
Repurchase of common stock						$ (19,303)
Issuance of restricted stock (in shares)						(728,000)
Purchase of Mueller Middle East							0
Dividends paid to noncontrolling interests							(9,312)
Net income attributable to noncontrolling interests	(6,752)						6,752
Foreign currency translation	$ 21,943						781
Common Stock, Shares, Outstanding, Ending Balance at Dec. 30, 2023	114,157,918	160,366,000
Treasury stock ending balance (in shares) at Dec. 30, 2023						46,208,000
Balance at end of year at Dec. 30, 2023	$ 2,358,716	$ 1,604	312,171	2,594,300	(47,221)	$ (523,409)	21,271
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares under two-for-one stock split (in shares)		0
Issuance of shares under two-for-one stock split		$ 0	0
Acquisition of shares under incentive stock option plans			338			(23,204)
Stock-based compensation expense			26,787
Issuance of restricted stock			(8,764)			$ 8,764
Net income attributable to Mueller Industries, Inc.	604,879			604,879
Dividends paid or payable to stockholders of Mueller Industries, Inc.				(91,341)
Total other comprehensive (loss) income attributable to Mueller Industries, Inc.	(35,749)				(33,058)
Issuance of shares under incentive stock option plans (in shares)						184,000
Repurchase of common stock (in shares)						929,000
Repurchase of common stock						$ (48,681)
Issuance of restricted stock (in shares)						(706,000)
Purchase of Mueller Middle East							0
Dividends paid to noncontrolling interests							0
Net income attributable to noncontrolling interests	(12,663)						12,663
Foreign currency translation	$ (30,541)						(2,691)
Common Stock, Shares, Outstanding, Ending Balance at Dec. 28, 2024	113,751,127	160,366,000
Treasury stock ending balance (in shares) at Dec. 28, 2024	15,900,000					46,615,000
Balance at end of year at Dec. 28, 2024	$ 2,804,408	$ 1,604	$ 330,532	$ 3,107,838	$ (80,279)	$ (586,530)	$ 31,243

CONSOLIDATED STATEMENTS OF CH_2

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical)		12 Months Ended
	Sep. 26, 2023	Dec. 28, 2024
Statement of Stockholders' Equity [Abstract]
Stock split ratio, common stock	2	2

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 28, 2024
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Nature of Operations The principal business of Mueller Industries, Inc. is the manufacture and sale of copper tube and fittings; line sets; steel nipples; brass rod, bar, and shapes; aluminum and brass forgings; aluminum impact extrusions; compressed gas valves; refrigeration valves and fittings; pressure vessels; insulated flexible duct systems; and high-quality wire and cable solutions. The Company also resells brass and plastic plumbing valves, plastic fittings, malleable iron fittings, faucets, and plumbing specialty products. The Company markets its products to the HVAC, plumbing, refrigeration, hardware, and other industries. Mueller’s operations are located throughout the United States and in Canada, Mexico, Great Britain, South Korea, the Middle East, and China. Fiscal Years The Company’s fiscal year ends on the last Saturday of December and consisted of 52 weeks in 2024 and 2023, and 53 weeks in 2022. These dates were December 28, 2024, December 30, 2023, and December 31, 2022. Basis of Presentation The Consolidated Financial Statements include the accounts of Mueller Industries, Inc. and its majority-owned subsidiaries. The noncontrolling interests represent a private ownership interest of 40 percent of Jungwoo Metal Ind. Co., LTD (Jungwoo-Mueller) and 45 percent of Mueller Middle East WLL (Mueller Middle East). The Company records the results of Jungwoo-Mueller one month in arrears in the Consolidated Financial Statements. Certain prior year balances have been reclassified to conform to current year presentation. Common Stock Split On September 26, 2023, the Company’s shareholders approved an amendment to the Company’s Restated Certificate of Incorporation to increase the total number of authorized shares of Common Stock from 100,000,000 to 250,000,000. Subsequently, the Company’s Board of Directors announced a two-for-one stock split of its common stock effected in the form of a stock dividend of one share for each outstanding share. The record date for the stock split was October 6, 2023, and the additional shares were distributed on October 20, 2023. Shares authorized in prior periods are not adjusted. All other references to share and per share amounts presented in the Consolidated Financial Statements and this Annual Report on Form 10-K have been adjusted retroactively to reflect the stock split. Revenue Recognition Given the nature of the Company’s business and product offerings, sales transactions with customers are generally comprised of a single performance obligation that involves delivery of the products identified in the contracts with customers. Performance obligations are generally satisfied at the point in time of shipment and payment is generally due within 60 days. Variable consideration is estimated for future rebates on certain product lines and product returns. The Company records variable consideration as an adjustment to the transaction price in the period it is incurred. Since variable consideration is settled within a short period of time, the time value of money is not significant. The cost of shipping product to customers is expensed as incurred as a component of cost of goods sold. The Company’s Domestic Piping Systems Group engages in certain transactions where it acts as an agent. Revenue from these transactions is recorded on a net basis. See “ Note 3 – Segment Information ” for additional information on disaggregation of revenue from contracts with customers. Acquisitions Accounting for acquisitions requires the Company to recognize separately from goodwill the assets acquired and liabilities assumed at their acquisition date fair values. Goodwill is measured as the excess of the purchase price over the net amount allocated to the identifiable assets acquired and liabilities assumed. While management uses its best estimates and assumptions to accurately value assets acquired and liabilities assumed at the acquisition date, the estimates are inherently uncertain and subject to refinement. As a result, during the measurement period, which may be up to one year from the acquisition date, the Company may record adjustments to the assets acquired and liabilities assumed with the corresponding offset to goodwill. The operating results generated by the acquired businesses are included in the Consolidated Statements of Income from their respective dates of acquisition. Acquisition related costs are expensed as incurred. See “ Note 2 – Acquisitions & Dispositions ” for additional information. Cash Equivalents and Restricted Cash Temporary investments with original maturities of three months or less are considered to be cash equivalents. These investments are stated at cost. At December 28, 2024 and December 30, 2023, temporary investments consisted of money market mutual funds, commercial paper, bank repurchase agreements, and U.S. and foreign government securities totaling approximately $776.6 million and $1.01 billion, respectively. Amounts included in restricted cash relate to required deposits in brokerage accounts that facilitate the Company’s hedging activities as well as imprest funds for the Company’s self-insured workers’ compensation program. See “ Note 4 – Cash, Cash Equivalents, and Restricted Cash ” for additional information. Short-Term Investments The fair value of short-term investments at December 28, 2024 and December 30, 2023, consisting of marketable securities, approximates the carrying value on that date. These marketable securities are stated at fair value and classified as level 1 within the fair value hierarchy. This classification is defined as a fair value determined using observable inputs that reflect quoted prices in active markets for identical assets. During 2024, the Company recognized gains of $0.9 million on short-term investments, of which $0.4 million was realized on the sale of marketable securities and the remaining $0.5 million represents unrealized gains relating to the excess fair value over the related cost basis of the marketable securities as of December 28, 2024. During 2023, the Company recognized gains of $41.9 million on short-term investments, of which $17.1 million was realized on the sale of marketable securities and the remaining $24.8 million represented unrealized gains relating to the excess fair value over the related cost basis of the marketable securities as of December 30, 2023. Allowance for Doubtful Accounts The Company routinely grants credit to many of its customers without collateral. The risk of credit loss in trade receivables is substantially mitigated by the credit evaluation process. The Company provides an allowance for receivables that may not be fully collected. In circumstances where the Company is aware of a customer’s inability to meet their financial obligations (e.g., bankruptcy filings or substantial credit rating downgrades), it records an allowance for doubtful accounts against amounts due to reduce the net recognized receivable to the amount it believes most likely will be collected. For all other customers, the Company recognizes an allowance for doubtful accounts based on its historical collection experience and the impact of current economic conditions. If circumstances change (e.g., greater than expected defaults or an unexpected material change in a major customer’s ability to meet their financial obligations), the Company could change its estimate of the recoverability of amounts due by a material amount. Historically, credit losses have been within management’s expectations. The balance for uncollectible accounts was $3.7 million and $2.8 million as of December 28, 2024 and December 30, 2023, respectively. Inventories The Company’s inventories are valued at the lower-of-cost-or-market. The material component of its U.S. copper tube and copper fittings inventories is valued on a LIFO basis and the non-material components of U.S. copper tube and copper fittings inventories are valued on a FIFO basis. The material component of its U.K. and Canadian copper tube inventories are valued on a FIFO basis. The material component of its brass rod, forgings, wire, and cable inventories are valued on a FIFO basis. Certain inventories are valued on an average cost basis. Elements of cost in finished goods inventory in addition to the cost of material include depreciation, amortization, utilities, maintenance, production wages, and transportation costs. The market price of copper cathode and scrap is subject to volatility. During periods when open market prices decline below net book value, the Company may need to provide an allowance to reduce the carrying value of its inventory. In addition, certain items in inventory may be considered obsolete and, as such, the Company may establish an allowance to reduce the carrying value of those items to their net realizable value. Changes in these estimates related to the value of inventory, if any, may result in a materially adverse impact on the Company’s reported financial position or results of operations. The Company recognizes the impact of any changes in estimates, assumptions, and judgments in income in the period in which it is determined. See “ Note 5 – Inventories ” for additional information. Leases The Company leases certain manufacturing facilities, distribution centers, office space, and equipment. Leases with an initial term of twelve months or less are not recorded on the balance sheet; expense for these leases is recognized on a straight line-basis over the term of the lease. Most of the Company’s leases include one or more options to renew up to five years and have remaining terms of one Note 8 – Leases ” for additional information. Property, Plant, and Equipment Property, plant, and equipment is stated at cost less accumulated depreciation. Expenditures for major additions and improvements are capitalized, while minor replacements, maintenance, and repairs are charged to expense as incurred. Depreciation of buildings, machinery, and equipment is provided on the straight-line method over the estimated useful lives ranging from 20 to 40 years for buildings and five The Company continually evaluates these assets to determine whether events or changes in circumstances have occurred that may warrant revision of the estimated useful life or whether the remaining balance should be evaluated for possible impairment. See “ Note 9 – Property, Plant, and Equipment, Net ” for additional information. Goodwill Goodwill is recognized for the excess of the purchase price over the fair value of tangible and identifiable intangible net assets of businesses acquired. Several factors give rise to goodwill in business acquisitions, such as the expected benefit from synergies of the combination and the existing workforce of the acquired business. Goodwill is evaluated annually for possible impairment as of the first day of the fourth quarter unless circumstances indicate the need to accelerate the timing of the evaluation. In the evaluation of goodwill impairment, management performs a qualitative assessment to determine if it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If the qualitative assessment is not conclusive, management compares the fair value of a reporting unit with its carrying amount and will recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value, not to exceed the total amount of goodwill allocated to the reporting unit. Fair value for the Company’s reporting units is determined using a combination of the income and market approaches (level 3 within the fair value hierarchy), incorporating market participant considerations and management’s assumptions on revenue growth rates, operating margins, discount rates and expected capital expenditures. The market approach measures the fair value of a business through the analysis of publicly traded companies or recent sales of similar businesses. The income approach uses a discounted cash flow model to estimate the fair value of reporting units based on expected cash flows (adjusted for capital investment required to support operations) and a terminal value. This cash flow stream is discounted to its present value to arrive at a fair value for each reporting unit. Future earnings are estimated using the Company’s most recent annual projections, applying a growth rate to future periods. Those projections are directly impacted by the condition of the markets in which the Company’s businesses participate. The discount rate selected for the reporting units is generally based on rates of return available for comparable companies at the date of valuation. Fair value determinations may include both internal and third-party valuations. See “ Note 10 – Goodwill and Other Intangible Assets ” for additional information. Intangible Assets Intangible assets include customer relationships, trade names, licenses, patents, technology, and other intangible assets acquired during business combinations and are amortized on a straight-line basis with estimated useful lives ranging from three Note 10 – Goodwill and Other Intangible Assets ” for additional information. Investments in Unconsolidated Affiliates Tecumseh The Company owns a 50 percent interest in an unconsolidated affiliate that acquired Tecumseh Products Company (Tecumseh) and an entity that provides financing to Tecumseh. This investment is recorded using the equity method of accounting, as the Company can exercise significant influence but does not own a majority equity interest or otherwise control the entity. Under the equity method of accounting, this investment is stated at initial cost and is adjusted for subsequent additional investments and the Company’s proportionate share of earnings or losses and distributions. The Company records its proportionate share of the investee’s net income or loss, net of foreign taxes, one quarter in arrears as income (loss) from unconsolidated affiliates, net of foreign tax, in the Consolidated Statements of Income. The Company’s proportionate share of the investee’s other comprehensive income (loss), net of income taxes, is recorded in the Consolidated Statements of Comprehensive Income and Consolidated Statements of Changes in Equity. The U.S. tax effect of the Company’s proportionate share of Tecumseh’s income or loss is recorded in income tax expense in the Consolidated Statements of Income. Retail Distribution The Company owns a 28 percent noncontrolling equity interest in a limited liability company in the retail distribution business. This investment is recorded using the equity method of accounting. The Company records its proportionate share of the investee’s net income or loss one month in arrears as income (loss) from unconsolidated affiliates in the Consolidated Statements of Income. The Company’s proportionate share of the investee’s other comprehensive income (loss), net of income taxes, is recorded in the Consolidated Statements of Comprehensive Income and Consolidated Statements of Changes in Equity. The investments in unconsolidated affiliates are assessed periodically for impairment and written down when the carrying amount is not considered fully recoverable. See “ Note 11 – Investments in Unconsolidated Affiliates ” for additional information. Self-Insurance Accruals The Company is primarily self-insured for workers’ compensation claims and benefits paid under certain employee health care programs. Accruals are primarily based on estimated undiscounted cost of claims, which includes incurred but not reported claims, and are classified as accrued wages and other employee costs. Pension Benefit Plans The Company sponsors qualified and nonqualified pension benefit plans in certain foreign locations. The Company recognizes the overfunded or underfunded status of the plans as an asset or liability in the Consolidated Balance Sheets with changes in the funded status recorded through comprehensive income in the year in which those changes occur. The obligations for these plans are determined by actuaries and affected by the assumptions, including discount rates, expected long-term return on plan assets for defined benefit pension plans, and certain employee-related factors, such as retirement age and mortality. The Company evaluates its assumptions periodically and makes adjustments as necessary. The expected return on plan assets is determined using the market value of plan assets. Differences between assumed and actual returns are amortized to the market value of assets on a straight-line basis over the average remaining service period of the plan participants using the corridor approach. The corridor approach defers all actuarial gains and losses resulting from variances between actual results and actuarial assumptions. These unrecognized gains and losses are amortized when the net gains and losses exceed 10 percent of the greater of the market value of the plan assets or the projected benefit obligation. The amount in excess of the corridor is amortized over the average remaining service period of the plan participants. For 2024, the average remaining service period for the pension plans was 11 years. We determine the discount rate (which is required to be the rate at which the projected benefit obligation could be effectively settled as of the measurement date) with the assistance of actuaries, who calculate the yield available on high quality corporate bonds of a term that reflects the maturity and duration of expected benefit payments. See “ Note 14 – Benefit Plans ” for additional information. Environmental Reserves and Environmental Expenses The Company recognizes an environmental liability when it is probable the liability exists and the amount is reasonably estimable. The Company estimates the duration and extent of its remediation obligations based upon reports of outside consultants, internal and third-party estimates and analyses of cleanup costs and ongoing monitoring costs, communications with regulatory agencies, and changes in environmental law. If the Company were to determine that its estimates of the duration or extent of its environmental obligations were no longer accurate, it would adjust environmental liabilities accordingly in the period that such determination is made. Estimated future expenditures for environmental remediation are not discounted to their present value. Environmental expenses that relate to ongoing operations are included as a component of cost of goods sold. Environmental expenses related to non-operating properties Note 15 – Commitments and Contingencies ” for additional information. Earnings Per Share Basic earnings per share is computed based on the weighted average number of common shares outstanding. Diluted earnings per share reflects the increase in weighted average common shares outstanding that would result from the assumed exercise of outstanding stock options and vesting of restricted stock awards calculated using the treasury stock method. There were no stock-based awards excluded from the computation of diluted earnings per share for the year ended December 28, 2024 because they were antidilutive. There were approximately 98 thousand stock-based awards excluded from the computation of diluted earnings per share for the years ended December 30, 2023 because they were antidilutive. Income Taxes Deferred income tax assets and liabilities are recognized when differences arise between the treatment of certain items for financial statement and tax purposes. Realization of certain components of deferred tax assets is dependent upon the occurrence of future events. The Company records valuation allowances to reduce its deferred tax assets to the amount it believes is more likely than not to be realized. These valuation allowances can be impacted by changes in tax laws, changes to statutory tax rates, and future taxable income levels and are based on the Company’s judgment, estimates, and assumptions regarding those future events. In the event the Company was to determine that it would not be able to realize all or a portion of the net deferred tax assets in the future, it would increase the valuation allowance through a charge to income tax expense in the period that such determination is made. Conversely, if it was to determine that it would be able to realize its deferred tax assets in the future, in excess of the net carrying amounts, the Company would decrease the recorded valuation allowance through a decrease to income tax expense in the period that such determination is made. The Company provides for uncertain tax positions and the related interest and penalties, if any, based upon management’s assessment of whether a tax benefit is more likely than not to be sustained upon examination by tax authorities. Tax benefits for uncertain tax positions that are recognized in the financial statements are measured as the largest amount of benefit, determined on a cumulative probability basis, that is more likely than not to be realized upon ultimate settlement. To the extent the Company prevails in matters for which a liability for an uncertain tax position is established or is required to pay amounts in excess of the liability, the Company’s effective tax rate in a given financial statement period may be affected. These estimates are highly subjective and could be affected by changes in business conditions and other factors. Changes in any of these factors could have a material impact on future income tax expense. See “ Note 16 – Income Taxes ” for additional information. Taxes Collected from Customers and Remitted to Governmental Authorities Taxes assessed by a governmental authority that are directly imposed on a revenue producing transaction between the Company and its customers, primarily value added taxes in foreign jurisdictions, are accounted for on a net (excluded from revenues and costs) basis. Stock-Based Compensation The Company has in effect stock incentive plans under which stock-based awards have been granted to certain employees and members of its Board of Directors. Stock-based compensation expense is recognized in the Consolidated Statements of Income as a component of selling, general, and administrative expense based on the grant date fair value of the awards. See “ Note 18 – Stock-Based Compensation ” for additional information. Concentrations of Credit and Market Risk Concentrations of credit risk with respect to accounts receivable are limited due to the large number of customers comprising the Company’s customer base, and their dispersion across different geographic areas and different industries, including HVAC, plumbing, refrigeration, hardware, automotive, OEMs, energy, telecommunication, electrical transmission and distribution, and others. The Company minimizes its exposure to base metal price fluctuations through various strategies. Generally, it prices an equivalent amount of copper raw material, under flexible pricing arrangements it maintains with its suppliers, at the time it determines the selling price of finished products to its customers. Derivative Instruments and Hedging Activities The Company’s earnings and cash flows are subject to fluctuations due to changes in commodity prices, foreign currency exchange rates, and interest rates. The Company uses derivative instruments such as commodity futures contracts, foreign currency forward contracts, and interest rate swaps to manage these exposures. All derivatives are recognized in the Consolidated Balance Sheets at their fair value. On the date the derivative contract is entered into, it is either a) designated as a hedge of (i) a forecasted transaction or the variability of cash flow to be paid (cash flow hedge) or (ii) the fair value of a recognized asset or liability (fair value hedge), or b) not designated in a hedge accounting relationship, even though the derivative contract was executed to mitigate an economic exposure (economic hedge), as the Company does not enter into derivative contracts for trading purposes. Changes in the fair value of a derivative that is qualified, designated, and highly effective as a cash flow hedge are recorded in stockholders’ equity within accumulated other comprehensive income (AOCI), to the extent effective, until they are reclassified to earnings in the same period or periods during which the hedged transaction affects earnings. Changes in the fair value of undesignated derivative instruments executed as economic hedges are reported in current earnings. The Company documents all relationships between derivative instruments and hedged items, as well as the risk-management objective and strategy for undertaking various hedge transactions. This process includes linking all derivative instruments that are designated as fair value hedges to specific assets and liabilities in the Consolidated Balance Sheets and linking cash flow hedges to specific forecasted transactions or variability of cash flow. The Company also assesses, both at the hedge’s inception and on an ongoing basis, whether the designated derivative instruments that are used in hedging transactions are highly effective in offsetting changes in cash flow or fair values of hedged items. When a derivative instrument is determined not to be highly effective as a hedge or the underlying hedged transaction is no longer probable of occurring, hedge accounting is discontinued prospectively in accordance with the derecognition criteria for hedge accounting. The Company primarily executes derivative contracts with major financial institutions. These counterparties expose the Company to credit risk in the event of non-performance. The amount of such exposure is limited to the fair value of the contract plus the unpaid portion of amounts due to the Company pursuant to terms of the derivative instruments, if any. If a downgrade in the credit rating of these counterparties occurs, management believes that this exposure is mitigated by provisions in the derivative arrangements which allow for the legal right of offset of any amounts due to the Company from the counterparties with any amounts payable to the counterparties by the Company. As a result, management considers the risk of loss from counterparty default to be minimal. See “ Note 7 – Derivative Instruments and Hedging Activities ” for additional information. Fair Value of Financial Instruments The carrying amounts for cash and cash equivalents, accounts receivable, and accounts payable approximate fair value due to the short-term maturity of these instruments. The fair value of long-term debt at December 28, 2024 approximates the carrying value on that date. The estimated fair values were determined based on quoted market prices and the current rates offered for debt with similar terms and maturities. The fair value of long-term debt is classified as level 2 within the fair value hierarchy. This classification is defined as a fair value determined using market-based inputs other than quoted prices that are observable for the liability, either directly or indirectly. Foreign Currency Translation For foreign subsidiaries for which the functional currency is not the U.S. dollar, balance sheet accounts are translated at exchange rates in effect at the end of the year and income statement accounts are translated at average exchange rates for the year. Translation gains and losses are included in equity as a component of AOCI. Transaction gains and losses that arise from exchange rate fluctuations on transactions denominated in a currency other than the functional currency are recognized in selling, general, and administrative expense in the Consolidated Statements of Income. Included in the Consolidated Statements of Income were net transaction gains of $7.3 million in 2024, losses of $4.4 million in 2023, and gains of $1.0 million in 2022. Use of and Changes in Estimates The preparation of financial statements in conformity with generally accepted accounting principles in the United States (U.S. GAAP) requires management to make estimates, assumptions, and judgments that affect the amounts reported in the financial statements and accompanying notes. Management makes its best estimate of the ultimate outcome for these items based on historical trends and other information available when the financial statements are prepared. Changes in estimates are recognized in accordance with the accounting rules for the estimate, which is typically in the period when new information becomes available to management. Areas where the nature of the estimate makes it reasonably possible that actual results could materially differ from amounts estimated include but are not limited to: pension and other postretirement benefit plan obligations, tax liabilities, loss contingencies, litigation claims, environmental reserves, acquisitions, and impairment assessments of long-lived assets (including goodwill). Recently Adopted Accounting Standards In November 2023, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures . The new guidance requires a public entity to disclose significant segment expenses and other segment items on an annual and interim basis and to provide in interim periods all disclosures about a reportable segment’s profit or loss and assets that are currently required annually. The guidance applies to all public entities and is effective for fiscal years beginning after December 15, 2023, and for interim periods beginning after December 15, 2024. The updated guidance requires retrospective adoption, and early adoption was permitted. The Company adopted the ASU during the fourth quarter of 2024 and updated its disclosures accordingly. See “ Note 3 – Segment Information ” for additional information. In June 2022, the FASB issued ASU 2022-03, Fair Value Measurement (Topic 820): Fair Value Measurement of Equity Securities Subject to Contractual Sale Restrictions. The new guidance was issued to clarify existing guidance measuring the fair value of an equity security subject to contractual restrictions that prohibit the sale of an equity security and introduce new disclosure requirements for applicable equity securities. The ASU was effective for fiscal years beginning after December 15, 2023 for public entities. The guidance requires prospective adoption, and early adoption was permitted. The Company adopted the ASU during the first quarter of 2023. The adoption of the ASU did not have a material impact on the Company’s Consolidated Financial Statements. Recently Issued Accounting Standards In November 2024, the FASB issued ASU 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses . The new guidance requires disclosure of additional information about specific expense categories. The guidance applies to all public entities and is effective for fiscal years beginning after December 15, 2026, and for interim periods beginning after December 15, 2027. The updated guidance requires prospective adoption but may be applied retrospectively, and early adoption is permitted. The Company is in the process of analyzing the impact of the standard on its disclosures. In March 2024, the Securities and Exchange Commission issued final rules on the enhancement and standardization of climate-related disclosures. The rules require disclosure of, among other things: material climate-related risks, activities to mitigate or adapt to such risks, governance and management of such risks, and material greenhouse gas (GHG) emissions from operations owned or controlled (Scope 1) and/or indirect emissions from purchased energy consumed in operations (Scope 2). Additionally, the rules require disclosure in the notes to the financial statements of the effects of severe weather events and other natural conditions, subject to certain materiality thresholds. The rules will become effective on a phased-in timeline in fiscal years beginning in 2025. The Company is in the process of analyzing the impact of the rules on its disclosures. In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures . The new guidance primarily enhances and expands both the income tax rate reconciliation disclosure and the income taxes paid disclosure. The ASU is effective for annual periods beginning after December 15, 2024 for public entities on a prospective basis. Early adoption is permitted. The Company

Acquisitions and Dispositions

Acquisitions and Dispositions	12 Months Ended
	Dec. 28, 2024
Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]
Acquisitions and Dispositions	Acquisitions and Dispositions 2024 Acquisitions Elkhart Products Corporation On August 2, 2024, the Company entered into an equity purchase agreement to acquire all of the outstanding shares of Elkhart Products Corporation (Elkhart) for approximately $38.2 million in cash at closing, net of cash acquired and working capital adjustments. Elkhart is a U.S. manufacturer of copper solder fittings with two manufacturing locations in Elkhart, Indiana and Fayetteville, Arkansas. The business complements the Company’s existing business within the Piping Systems segment where the operating results are included in the Domestic Piping Systems Group . The acquisition of Elkhart was not material to the Company's financial position or results of operations; therefore, pro forma operating results and other disclosures related to the acquisition are not presented as the results would not be significantly different than the reported results. Nehring Electrical Works Company On April 19, 2024, the Company entered into an equity purchase agreement to acquire Nehring Electrical Works Company and certain of its affiliated companies (collectively, “Nehring”). The transaction closed on May 28, 2024, whereby the Company purchased all of the outstanding equity of Nehring for approximately $569.2 million, net of working capital adjustments. The total purchase price consisted of $564.5 million in cash at closing and a contingent consideration arrangement which requires the Company to pay the sellers up to $19.0 million based on EBITDA growth of the acquired business. Nehring produces high-quality wire and cable solutions for the utility, telecommunication, electrical distribution, and OEM markets. Nehring provides the Company a substantial platform for expansion in the energy infrastructure space. The acquired business is reported in the Company’s Industrial Metals segment. Since the acquisition date, Nehring has reported net sales of $220.7 million and operating income of $12.4 million. The Company incurred approximately $2.7 million of transaction-related expenses which are included in selling, general, and administrative expense in the Consolidated Statement of Income for the year ended December 28, 2024. The following table presents pro forma consolidated results of operations as if the Nehring acquisition had occurred at the beginning of 2023. The pro forma information does not purport to be indicative of the results that would have been obtained if the operations had actually been combined during the periods presented, and is not necessarily indicative of operating results to be expected in future periods. The most significant pro forma adjustments to the historical results of operations relate to the application of purchase accounting and the amortization for intangible assets acquired, the financing structure, and estimated income taxes. (In thousands, except per share data) 2024 2023 Net sales $ 3,903,228 $ 3,811,909 Net income 608,961 624,683 Basic earnings per share $ 5.47 $ 5.61 Diluted earnings per share $ 5.34 $ 5.50 Purchase Price Allocations These acquisitions were accounted for using the acquisition method of accounting whereby the total purchase price was alloca ted to tangible and intangible assets acquired and liabilities assumed based on respective fair values. The following table summarizes the allocation of the purchase price to acquire these businesses, which were financed by available cash balances, as well as the assets acquired and liabilities assumed at the respective acquisition dates. The purchase price allocations for both acquisitions are provisional as of December 28, 2024 and subject to change during the measurement periods. (In thousands) Elkhart Nehring Total consideration $ 38,158 $ 569,171 Allocated to: Accounts receivable 10,827 41,666 Inventories 18,720 38,803 Other current assets 356 960 Property, plant, and equipment 5,916 98,819 Tax-deductible goodwill 15,107 146,137 Intangible assets — 271,700 Total assets acquired 50,926 598,085 Accounts payable 5,962 19,569 Other current liabilities 6,806 9,345 Total liabilities assumed 12,768 28,914 Net assets acquired $ 38,158 $ 569,171 In determining the fair value of amounts above related to Nehring, the Company utilized various forms of the income, cost and market approaches depending on the asset or liability being valued. The estimation of fair value required judgment related to future net cash flows, discount rates, customer attrition rates, competitive trends, market comparisons and other factors. As a result, the Company utilized third-party valuation specialists to assist in determining the fair value of certain assets. Inputs were generally determined by taking into account independent appraisals and historical data, supplemented by current and anticipated market conditions. The amounts in the table above represent the provisional purchase price allocation for the 2024 acquisitions. These purchase price allocations, including the residual amount allocated to goodwill, are based on preliminary information and are subject to change as additional information concerning final asset and liability valuations are obtained and management completes its reassessment of the measurement period procedures based on the results of the preliminary valuation. The purchase price allocation for Elkhart is provisional due to the proximity of the acquisition date to December 28, 2024, and as a result no elements of the purchase price allocation have been finalized. The purchase price allocation for Nehring is provisional with respect to final review of the valuation of the intangible assets, with the other areas of the allocation substantially complete. During the applicable measurement period, the Company will adjust assets and liabilities if new information is obtained about facts and circumstances that existed as of the acquisition date that, if known, would have resulted in revised estimated values of those assets or liabilities as of that date. The effect of measurement period adjustments to the estimated fair values will be reflected as if the adjustments had been completed on the acquisition date. The following details the total intangible assets identified in the allocation of the purchase price at the respective acquisition dates: (In thousands) Estimated Useful Life Nehring Intangible asset type: Customer relationships 20 years $ 208,080 Non-compete agreements 5 years 700 Trade names 15 years 54,530 Certifications 5 years 8,390 Total intangible assets $ 271,700 2023 Disposition Heatlink Group Effective July 3, 2023, the Company transferred 100 percent of the outstanding shares of Heatlink Group, Inc. and Heatlink Group USA, LLC for an additional 11 percent equity interest in the limited liability company in the retail distribution business. This equity interest, combined with the 17 percent equity interest acquired with the contribution of Die-Mold in 2021, gave the Company a 28 percent equity interest in the limited liability company. Heatlink Group produces a complete line of products for PEX plumbing and radiant systems in Canada and sells these products in Canada and the U.S. and was included in the Piping Systems segment. Heatlink Group reported net sales of $15.6 million and operating income of $1.7 million for the year ended December 30, 2023 compared to net sales of $39.1 million and operating income of $7.2 million for the year ended December 31, 2022. As a result of the transaction, the Company recognized a gain of $4.1 million in 2023 based on the excess of the fair value of the consideration received (the 11 percent equity interest) over the carrying value of Heatlink Group. The Company equally weighted an income discounted cash flow approach and market comparable companies approach using an EBITDA multiple to determine the fair value of the consideration received of $26.0 million, which was recognized within the Investments in unconsolidated affiliates line of the Consolidated Balance Sheet as of December 30, 2023. The excess of the fair value of the deconsolidated subsidiary over its carrying value resulted in the gain.

Segment Information

Segment Information	12 Months Ended
	Dec. 28, 2024
Segment Reporting [Abstract]
Segment Information	Segment Information The Company’s reportable segments are Piping Systems, Industrial Metals, and Climate. Each of the reportable segments is composed of certain operating segments that are aggregated primarily by the nature of products offered as follows: Piping Systems Piping Systems is composed of the following operating segments: Domestic Piping Systems Group (including Elkhart, acquired in fiscal August 2024), Great Lakes Copper, European Operations, Trading Group, Jungwoo-Mueller (the Company’s South Korean joint venture), and Mueller Middle East (the Company’s Bahraini joint venture). The Domestic Piping Systems Group manufactures and distributes copper tube, fittings, and line sets. These products are manufactured in the U.S., sold in the U.S., and exported to markets worldwide. Outside the U.S., Great Lakes Copper manufactures copper tube and line sets in Canada and sells the products primarily in the U.S. and Canada. European Operations manufactures copper tube in the U.K. which is sold primarily in Europe. The Trading Group manufactures pipe nipples and resells brass and plastic plumbing valves, malleable iron fittings, faucets, and plumbing specialty products in the U.S. and Mexico. Jungwoo-Mueller manufactures copper-based joining products that are sold worldwide. Mueller Middle East manufactures copper tube and serves markets in the Middle East and Northern Africa. The Piping Systems segment’s products are sold primarily to plumbing, refrigeration, and air-conditioning wholesalers, hardware wholesalers and co-ops, building product retailers, and air-conditioning OEMs. As disclosed in “ Note 2 – Acquisitions & Dispositions ,” during 2023 the Company exchanged the outstanding common stock of Heatlink Group for an additional equity interest in a limited liability company in the retail distribution business, resulting in the deconsolidation of Heatlink Group and the recognition of a $4.1 million gain. This gain is reported within Corporate and Eliminations. The results of Heatlink Group, prior to deconsolidation, were included within the Piping Systems segment. Industrial Metals Industrial Metals is composed of the following operating segments: Brass Rod, Impacts & Micro Gauge, Brass Value-Added Products, Precision Tube, and Nehring (acquired in fiscal June 2024). These businesses manufacture brass rod, impact extrusions and forgings, specialty copper, copper alloy, and aluminum tube, as well as a wide variety of end products including plumbing brass, automotive components, valves, fittings, gas assemblies, and high-quality wire and cable solutions. These products are manufactured in the U.S. and sold primarily to OEMs and utilities in the U.S., many of which are in the industrial, transportation, construction, heating, ventilation, and air-conditioning, plumbing, refrigeration, energy, telecommunication, and electrical transmission and distribution markets. Climate Climate is composed of the following operating segments: Refrigeration Products, Westermeyer, Turbotec, Flex Duct, and Linesets, Inc. These domestic businesses manufacture and fabricate valves, assemblies, high pressure components, coaxial heat exchangers, insulated HVAC flexible duct systems, and line sets primarily for the heating, ventilation, air-conditioning, and refrigeration markets in the U.S. During 2024 the Company sold two buildings, resulting in gains of $4.5 million recognized in the segment. During 2023 the Company settled the insurance claim related to the August 2022 fire in its Bluffs, Illinois manufacturing operation, resulting in a gain of $19.5 million recognized in the segment. The Company’s chief operating decision maker (CODM) is the chief executive officer. Performance of segments is generally evaluated by their operating income. Summarized product line, geographic, and segment information is shown in the following tables. Unallocated expenses include general corporate expenses, plus certain charges or credits not included in segment activity. Geographic sales data indicates the location from which products are shipped. During 2024, 2023, and 2022, no single customer exceeded 10 percent of worldwide sales. The following tables represent a disaggregation of revenue from contracts with customers, along with the reportable segment for each category: For the Year Ended December 28, 2024 (In thousands) Piping Systems Industrial Metals Climate Total Tube and fittings $ 2,063,777 $ — $ — $ 2,063,777 Brass rod, forgings, wire and cable — 695,883 — 695,883 OEM components and valves — 73,197 118,626 191,823 Valves and plumbing specialties 450,319 — — 450,319 Flex duct and other HVAC components — — 369,820 369,820 Other — 49,359 — 49,359 $ 2,514,096 $ 818,439 $ 488,446 $ 3,820,981 Intersegment sales (52,215) Net sales $ 3,768,766 Disaggregation of revenue from contracts with customers (continued): For the Year Ended December 30, 2023 (In thousands) Piping Systems Industrial Metals Climate Total Tube and fittings $ 1,926,975 $ — $ — $ 1,926,975 Brass rod and forgings — 454,246 — 454,246 OEM components, tube & assemblies — 79,879 120,923 200,802 Valves and plumbing specialties 455,598 — — 455,598 Flex duct and other HVAC components — — 379,867 379,867 Other — 43,750 — 43,750 $ 2,382,573 $ 577,875 $ 500,790 $ 3,461,238 Intersegment sales (40,893) Net sales $ 3,420,345 For the Year Ended December 31, 2022 (In thousands) Piping Systems Industrial Metals Climate Total Tube and fittings $ 2,211,963 $ — $ — $ 2,211,963 Brass rod and forgings — 510,865 — 510,865 OEM components, tube & assemblies — 74,647 121,004 195,651 Valves and plumbing specialties 518,121 — — 518,121 Flex duct and other HVAC components — — 529,303 529,303 Other — 59,177 — 59,177 $ 2,730,084 $ 644,689 $ 650,307 $ 4,025,080 Intersegment sales (42,625) Net sales $ 3,982,455 Summarized segment information is as follows: For the Year Ended December 28, 2024 (In thousands) Piping Systems Industrial Metals Climate Total External net sales $ 2,477,729 $ 803,277 $ 487,760 $ 3,768,766 Internal net sales 36,367 15,162 686 52,215 2,514,096 818,439 488,446 3,820,981 Reconciliation of net sales: Elimination of intersegment net sales (52,215) Total net sales 3,768,766 Less: (1) Manufacturing costs (2) 1,797,203 697,400 317,263 2,811,866 Sales and marketing expense 27,605 3,822 13,707 45,134 Distribution expense 39,108 2,237 2,137 43,482 Other segment items (3) 32,729 22,420 9,285 64,434 Segment operating income 617,451 92,560 146,054 856,065 Reconciliation of segment operating income: Corporate expenses (85,676) Interest expense (410) Interest income 53,468 Realized and unrealized gains on short-term investments 914 Environmental expense (2,218) Gain on extinguishment of NMTC liability 1,265 Other expense, net (2,946) Income before income taxes $ 820,462 (1) The significant expense categories and amounts align with the segment-level information that is regularly provided to the CODM. Intersegment expenses are included within the amounts shown. (2) Manufacturing costs include material, manufacturing conversion costs, and freight. (3) Other segment items include administrative employee compensation expense, professional fees, foreign currency exchange gains/losses, other overhead costs, and other items such as gains/losses on sale of assets, impairment charges, and gains on insurance settlements (as applicable). Segment information (continued): For the Year Ended December 30, 2023 (In thousands) Piping Systems Industrial Metals Climate Total External net sales $ 2,355,516 $ 564,115 $ 500,714 $ 3,420,345 Internal net sales 27,057 13,760 76 40,893 2,382,573 577,875 500,790 3,461,238 Reconciliation of net sales: Elimination of intersegment net sales (40,893) Total net sales 3,420,345 Less: (1) Manufacturing costs (2) 1,703,161 487,245 318,588 2,508,994 Sales and marketing expense 26,549 2,412 13,981 42,942 Distribution expense 36,645 2,331 2,410 41,386 Other segment items (3) 46,979 9,508 (6,053) 50,434 Segment operating income 569,239 76,379 171,864 817,482 Reconciliation of segment operating income: Corporate expenses (61,429) Interest expense (1,221) Interest income 38,208 Realized and unrealized gains on short-term investments 41,865 Environmental expense (825) Gain on extinguishment of NMTC liability 7,534 Other income, net 3,618 Income before income taxes $ 845,232 Segment information (continued): For the Year Ended December 31, 2022 (In thousands) Piping Systems Industrial Metals Climate Total External net sales $ 2,706,065 $ 627,270 $ 649,120 $ 3,982,455 Internal net sales 24,019 17,419 1,187 42,625 2,730,084 644,689 650,307 4,025,080 Reconciliation of net sales: Elimination of intersegment net sales (42,625) Total net sales 3,982,455 Less: (1) Manufacturing costs (2) 1,960,977 550,040 425,236 2,936,253 Sales and marketing expense 24,292 2,358 19,131 45,781 Distribution expense 35,772 2,368 2,687 40,827 Other segment items (3) 37,981 7,459 15,186 60,626 Segment operating income 671,062 82,464 188,067 941,593 Reconciliation of segment operating income: Corporate expenses (64,444) Interest expense (810) Interest income 6,457 Realized and unrealized gains on short-term investments 2,918 Environmental expense (1,298) Pension plan termination expense (13,100) Other income, net 4,715 Income before income taxes $ 876,031 Other segment disclosures: For the Year Ended December 28, 2024 (In thousands) Piping Systems Industrial Metals Climate Corporate and Unallocated Total Depreciation and amortization (4) $ 20,048 $ 21,511 $ 6,535 $ 5,039 $ 53,133 Loss (gain) on sale of assets, net 257 — (4,471) (1,566) (5,780) Expenditures for long-lived assets (including those resulting from business acquisitions) 26,433 138,211 8,533 11,762 184,939 Segment assets 1,167,955 812,751 264,738 1,045,462 3,290,906 (4) The amount of depreciation and amortization disclosed by reportable segment is included within the other segment expense captions, such as manufacturing costs or other segment items. Other segment disclosures (continued): For the Year Ended December 30, 2023 (In thousands) Piping Systems Industrial Metals Climate Corporate and Unallocated Total Depreciation and amortization (4) $ 20,461 $ 7,273 $ 7,567 $ 4,653 $ 39,954 Gain on sale of businesses — — — (4,137) (4,137) Impairment charges 6,258 — — — 6,258 Gain on insurance settlement — — (19,466) — (19,466) Expenditures for long-lived assets (including those resulting from business acquisitions) 19,118 9,406 15,407 10,094 54,025 Segment assets 1,029,821 157,761 252,561 1,319,158 2,759,301 For the Year Ended December 31, 2022 (In thousands) Piping Systems Industrial Metals Climate Corporate and Unallocated Total Depreciation and amortization (4) $ 22,193 $ 7,647 $ 9,174 $ 4,717 $ 43,731 Gain on sale of assets, net — — — (6,373) (6,373) Expenditures for long-lived assets (including those resulting from business acquisitions) 20,694 6,905 2,611 7,429 37,639 Segment assets 1,088,940 160,702 279,940 712,817 2,242,399 Summarized geographic information is as follows: (In thousands) 2024 2023 2022 Net sales: United States $ 2,826,574 $ 2,572,141 $ 2,965,053 United Kingdom 280,726 270,128 297,582 Canada 344,614 339,682 410,679 Asia and the Middle East 231,092 153,816 217,750 Mexico 85,760 84,578 91,391 Total net sales $ 3,768,766 $ 3,420,345 $ 3,982,455 Long-lived assets: 2024 2023 2022 United States $ 412,294 $ 273,604 $ 266,571 United Kingdom 37,876 40,045 36,474 Canada 15,597 18,152 23,354 Asia and the Middle East 48,115 50,725 51,193 Mexico 1,249 2,639 2,358 Total long-lived assets $ 515,131 $ 385,165 $ 379,950

Cash, Cash Equivalents, and Res

Cash, Cash Equivalents, and Restricted Cash	12 Months Ended
	Dec. 28, 2024
Cash and Cash Equivalents [Abstract]
Cash, Cash Equivalents, and Restricted Cash	Cash, Cash Equivalents, and Restricted Cash (In thousands) 2024 2023 Cash & cash equivalents $ 1,037,229 $ 1,170,893 Restricted cash included within other current assets 1,564 3,228 Restricted cash included within other assets 102 102 Total cash, cash equivalents, and restricted cash $ 1,038,895 $ 1,174,223

Inventories

Inventories	12 Months Ended
	Dec. 28, 2024
Inventory Disclosure [Abstract]
Inventories	Inventories (In thousands) 2024 2023 Raw materials and supplies $ 147,964 $ 111,843 Work-in-process 74,684 61,793 Finished goods 251,447 220,629 Valuation reserves (11,816) (14,017) Inventories $ 462,279 $ 380,248 Inventories valued using the LIFO method totaled $12.4 million at December 28, 2024 and $20.2 million at December 30, 2023. At December 28, 2024 and December 30, 2023, the approximate FIFO cost of such inventories was $128.0 million and $122.9 million, respectively. At the end of 2024 and 2023, the FIFO value of inventories consigned to others was $17.1 million and $19.8 million, respectively.

Consolidated Financial Statemen

Consolidated Financial Statement Details	12 Months Ended
	Dec. 28, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Consolidated Financial Statement Details	Consolidated Financial Statement Details Other Current Liabilities Included in other current liabilities Other Income, Net (In thousands) 2024 2023 2022 Net periodic benefit (cost) income $ (299) $ 765 $ 3,168 Accounts payable discounts 1,260 1,502 1,609 Other (3,907) 1,351 (62) Other (expense) income, net $ (2,946) $ 3,618 $ 4,715

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities	12 Months Ended
	Dec. 28, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities	Derivative Instruments and Hedging Activities The Company’s earnings and cash flows are subject to fluctuations due to changes in commodity prices, foreign currency exchange rates, and interest rates. The Company uses derivative instruments such as commodity futures contracts, foreign currency forward contracts, and interest rate swaps to manage these exposures. Commodity Futures Contracts Copper and brass represent the largest component of the Company’s variable costs of production. The cost of these materials is subject to global market fluctuations caused by factors beyond the Company’s control. The Company occasionally enters into forward fixed-price arrangements with certain customers; the risk of these arrangements is generally managed with commodity futures contracts. These futures contracts have been designated as cash flow hedges. At December 28, 2024, the Company held open futures contracts to purchase approximately $25.1 million of copper over the next 12 months related to fixed price sales orders. The fair value of those futures contracts was a $0.4 million net loss position, which was determined by obtaining quoted market prices (level 1 within the fair value hierarchy). In the next 12 months, the Company will reclassify into earnings realized gains or losses relating to cash flow hedges. At December 28, 2024, this amount was approximately $0.3 million of deferred net losses, net of tax. The Company may also enter into futures contracts to protect the value of inventory against market fluctuations. At December 28, 2024, the Company held open futures contracts to sell approximately $4.0 million of copper over the next seven months related to copper inventory. The fair value of those futures contracts was a $0.2 million net gain position, which was determined by obtaining quoted market prices (level 1 within the fair value hierarchy). The Company presents its derivative assets and liabilities in the Consolidated Balance Sheets on a net basis by counterparty. The following table summarizes the location and fair value of the derivative instruments and disaggregates the net derivative assets and liabilities into gross components on a contract-by-contract basis: Asset Derivatives Liability Derivatives Fair Value Fair Value (In thousands) Balance Sheet Location 2024 2023 Balance Sheet Location 2024 2023 Commodity contracts - gains Other current assets $ 235 $ 589 Other current liabilities $ 42 $ 16 Commodity contracts - losses Other current assets (62) (281) Other current liabilities (405) (383) Total derivatives (1) $ 173 $ 308 $ (363) $ (367) (1) Does not include the impact of cash collateral provided to counterparties . The following table summarizes the effects of derivative instruments on the Consolidated Statements of Income: (In thousands) Location 2024 2023 Undesignated derivatives: Loss on commodity contracts (nonqualifying) Cost of goods sold $ (2,305) $ (1,071) The following tables summarize amounts recognized in and reclassified from AOCI during the period: For the Year Ended December 28, 2024 (In thousands) Gain Recognized in AOCI (Effective Portion), Net of Tax Classification Gains (Losses) Gain Reclassified from AOCI (Effective Portion), Net of Tax Cash flow hedges: Commodity contracts $ 168 Cost of goods sold $ (586) Other 14 Other — Total $ 182 Total $ (586) For the Year Ended December 30, 2023 (In thousands) Gain (Loss) Recognized in AOCI (Effective Portion), Net of Tax Classification Gains (Losses) Gain Reclassified from AOCI (Effective Portion), Net of Tax Cash flow hedges: Commodity contracts $ 1,180 Cost of goods sold $ (2,419) Other (34) Other — Total $ 1,146 Total $ (2,419) The Company primarily enters into International Swaps and Derivatives Association master netting agreements with major financial institutions that permit the net settlement of amounts owed under their respective derivative contracts. Under these master netting agreements, net settlement generally permits the Company or the counterparty to determine the net amount payable for contracts due on the same date and in the same currency for similar types of derivative transactions. The master netting agreements generally also provide for net settlement of all outstanding contracts with the counterparty in the case of an event of default or a termination event. The Company does not offset fair value amounts for derivative instruments and fair value amounts recognized for the right to reclaim cash collateral. At December 28, 2024 and December 30, 2023, the Company had recorded restricted cash in other current assets of $1.4 million and $3.2 million, respectively, as collateral related to open derivative contracts under the master netting arrangements.

Leases

Leases	12 Months Ended
	Dec. 28, 2024
Leases [Abstract]
Leases	Leases The Company leases certain facilities, vehicles, and equipment which expire on various dates through 2041. The following table includes supplemental information with regards to the Company’s operating leases: (In thousands, except lease term and discount rate) 2024 2023 Operating lease right-of-use assets $ 32,702 $ 35,170 Current portion of operating lease liabilities 8,117 7,893 Noncurrent operating lease liabilities 24,547 26,683 Total operating lease liabilities $ 32,664 $ 34,576 Weighted average discount rate 3.87 % 3.55 % Weighted average remaining lease term (in years) 4.72 5.24 Some of the Company’s leases include variable lease costs such as taxes, insurance, etc. These costs are immaterial for disclosure. The following table presents certain information related to operating lease costs and cash paid during the period: For the Year Ended (In thousands) December 28, 2024 December 30, 2023 Operating lease costs $ 10,036 $ 9,705 Short term lease costs 3,512 3,843 Total lease costs $ 13,548 $ 13,548 Cash paid for amounts included in the measurement of lease liabilities $ 9,609 $ 9,276 Maturities of the Company’s operating leases are as follows: (In thousands) Amount 2025 $ 9,137 2026 8,406 2027 7,063 2028 4,234 2029 3,053 2030 and thereafter 3,566 Total lease payments 35,459 Less imputed interest (2,795) Total lease obligations 32,664 Less current obligations (8,117) Noncurrent lease obligations $ 24,547

Property, Plant, and Equipment,

Property, Plant, and Equipment, Net	12 Months Ended
	Dec. 28, 2024
Property, Plant and Equipment [Abstract]
Property, Plant, and Equipment, Net	Property, Plant, and Equipment, Net (In thousands) 2024 2023 Land and land improvements $ 36,853 $ 33,127 Buildings 258,355 232,169 Machinery and equipment 759,202 654,079 Construction in progress 79,216 82,552 1,133,626 1,001,927 Less accumulated depreciation (618,495) (616,762) Property, plant, and equipment, net $ 515,131 $ 385,165

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	12 Months Ended
	Dec. 28, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets Goodwill The changes in the carrying amount of goodwill by segment were as follows: (In thousands) Piping Systems Industrial Metals Climate Total Goodwill $ 178,574 $ 8,854 $ 21,652 $ 209,080 Accumulated impairment charges (40,552) (8,853) (2,087) (51,492) Balance at December 31, 2022: 138,022 1 19,565 157,588 Reductions (1) (7,007) — — (7,007) Currency translation 1,239 — — 1,239 Balance at December 30, 2023: 132,254 1 19,565 151,820 Additions (2) 15,107 146,137 — 161,244 Currency translation (1,899) — — (1,899) Balance at December 28, 2024: Goodwill 186,014 154,991 21,652 362,657 Accumulated impairment charges (40,552) (8,853) (2,087) (51,492) Goodwill, net $ 145,462 $ 146,138 $ 19,565 $ 311,165 (1) Includes disposal of Heatlink Group business. (2) Includes acquisitions of Nehring and Elkhart businesses. Reporting units with recorded goodwill include Domestic Piping Systems Group, B&K LLC, Great Lakes, European Operations, Jungwoo-Mueller, Mueller Middle East, Westermeyer, Flex Duct, and Nehring . Several factors give rise to goodwill in the Company’s acquisitions, such as the expected benefit from synergies of the combination and the existing workforce of the acquired businesses. For 2024, the Company utilized a qualitative assessment in the annual goodwill impairment testing for all reporting units, except the European Operations and Nehring Electrical Works reporting units. Based on the qualitative assessment, the Company concluded that it was more likely than not that the fair value of those reporting units exceeded their respective carrying values. The Company chose to perform a quantitative impairment analysis in the fourth quarter of 2024 for its European Operations and Nehring Electrical Works reporting units. As a result of these quantitative analyses no impairment loss was recognized for the goodwill of the respective reporting units. Other Intangible Assets The carrying amount of intangible assets at December 28, 2024 was as follows: (In thousands) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Customer relationships $ 259,831 $ (25,403) $ 234,428 Non-compete agreements 2,847 (2,229) 618 Patents and technology 16,385 (8,915) 7,470 Trade names and licenses 74,816 (10,975) 63,841 Other 1,715 (1,715) — Other intangible assets $ 355,594 $ (49,237) $ 306,357 The carrying amount of intangible assets at December 30, 2023 was as follows: (In thousands) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Customer relationships $ 50,009 $ (17,535) $ 32,474 Non-compete agreements 2,325 (2,325) — Patents and technology 16,681 (8,119) 8,562 Trade names and licenses 12,092 (6,920) 5,172 Other 1,715 (1,715) — Other intangible assets $ 82,822 $ (36,614) $ 46,208 Amortization expense for intangible assets was $13.9 million in 2024, $5.0 million in 2023, and $5.6 million in 2022. Future amortization expense is estimated as follows: (In thousands) Amount 2025 $ 20,419 2026 20,281 2027 20,280 2028 20,042 2029 18,743 Thereafter 206,592 Expected amortization expense $ 306,357

Investment in Unconsolidated Af

Investment in Unconsolidated Affiliates	12 Months Ended
	Dec. 28, 2024
Equity Method Investments and Joint Ventures [Abstract]
Investment in Unconsolidated Affiliates	Investments in Unconsolidated Affiliates Tecumseh The Company owns a 50 percent interest in an unconsolidated affiliate that acquired Tecumseh and an entity that provides financing to Tecumseh. Tecumseh is a global manufacturer of hermetically sealed compressors for residential and specialty air conditioning, household refrigerators and freezers, and commercial refrigeration applications, including air conditioning and refrigeration compressors, as well as condensing units, heat pumps, and complete refrigeration systems. The Company’s net income ( loss) from unconsolidated affiliates, net of foreign tax, for 2024, 2023, and 2022 included losses of $9.5 million, losses of $22.7 million, and income of $5.2 million, respectively, for Tecumseh. During 2024, the Company advanced Tecumseh $12.5 million, which was comprised of a capital contribution of $8.7 million and a note receivable of $3.8 million. These advances did not change the Company’s proportionate ownership in Tecumseh. Retail Distribution The Company owns a 28 percent noncontrolling equity interest in a limited liability company in the retail distribution business. The Company’s net income ( loss) from unconsolidated affiliates, net of foreign tax, for 2024, 2023, and 2022 included income of $11.7 million, $7.9 million, and $4.9 million, respectively, for the retail distribution business.

Debt

Debt	12 Months Ended
	Dec. 28, 2024
Debt Disclosure [Abstract]
Debt	Debt Credit Agreement The Company’s Credit Agreement provides for an unsecured $400.0 million revolving credit facility that matures on March 31, 2026. There were no borrowings outstanding under the Credit Agreement as of December 28, 2024 or December 30, 2023. Borrowings under the Revolving Credit Facility bear interest, at the Company’s option, at the Eurocurrency Rate which is determined by the underlying currency of the Credit Extension or the Base Rate as defined by the Credit Agreement, plus a variable premium. Advances may be based upon the one, three, or six-month interest period. The variable premium is based upon the Company’s debt to total capitalization ratio, and can range from 112.5 to 162.5 basis points for Eurocurrency Rate loans and 12.5 to 62.5 basis points for Base Rate loans. Additionally, a commitment fee is payable quarterly on the total commitment less any outstanding loans or issued letters of credit, and varies from 15.0 to 30.0 basis points based upon the Company’s debt to total capitalization ratio. Availability of funds under the Revolving Credit Facility is reduced by the amount of certain outstanding letters of credit, which are used to secure the Company’s payment of insurance deductibles, certain retiree health benefits, and other corporate obligations, totaling approximately $28.8 million at December 28, 2024. Terms of the letters of credit are generally renewable annually. Jungwoo-Mueller Jungwoo-Mueller has several secured revolving credit arrangements with a total borrowing capacity of KRW 18.0 billion (or approximately $12.8 million). Borrowings are secured by the real property and equipment of Jungwoo-Mueller. Covenants contained in the Company’s financing obligations require, among other things, the maintenance of minimum levels of tangible net worth and the satisfaction of certain minimum financial ratios. At December 28, 2024, the Company was in compliance with all debt covenants.

New Markets Tax Credit Transact

New Markets Tax Credit Transactions	12 Months Ended
	Dec. 28, 2024
New Markets Tax Credit Transaction [Abstract]
New Markets Tax Credit Transactions	Note 13 – New Markets Tax Credit Transactions On October 18, 2016, the Company entered into a financing transaction with Wells Fargo Community Investment Holdings, LLC (Wells Fargo) related to an equipment modernization project at the Company’s copper tube and line sets production facilities in Fulton, MS. Wells Fargo made a capital contribution and the Company made a loan to MCTC Investment Fund, LLC (Investment Fund) under a qualified New Markets Tax Credit (NMTC) program. The NMTC program was provided for in the Community Renewal Tax Relief Act of 2000 (CRTR Act) and is intended to induce capital investment in qualified lower income communities. The CRTR Act permits taxpayers to claim credits against their Federal income taxes for up to 39 percent of qualified investments in the equity of community development entities (CDEs). CDEs are privately managed investment institutions that are certified to make qualified low-income community investments. In connection with the financing, Wells Fargo contributed to the Investment Fund, and as such, Wells Fargo is entitled to substantially all of the benefits derived from the NMTCs. The Investment Fund then contributed the proceeds to certain CDEs, which, in turn, loaned the funds on similar terms as the Leverage Loan to Mueller Copper Tube Company, Inc. (MCTC), an indirect, wholly-owned subsidiary of the Company. The proceeds of the loans from the CDEs, including loans representing the capital contribution made by Wells Fargo, net of syndication fees, are restricted for use on the modernization project. The NMTC is subject to 100 percent recapture for a period of seven years as provided in the Internal Revenue Code. The Company was required to comply with various regulations and contractual provisions that apply to the NMTC arrangement. Non-compliance with applicable requirements could result in projected tax benefits not being realized and, therefore, require the Company to indemnify Wells Fargo for any loss or recapture of NMTCs related to the financing until such time as the Company’s obligation to deliver tax benefits is relieved. This transaction also included a put/call provision whereby the Company may be obligated or entitled to repurchase Wells Fargo’s interest in the Investment Fund. The Company previously determined the financing arrangement with the Investment Fund and CDEs is a variable interest entity (VIE), and that it is the primary beneficiary of the VIE and has included the VIE in the Company’s Consolidated Financial Statements. In December 2023, Wells Fargo exercised the put option, and as such the Company recognized a gain on the extinguishment of the liability representing Wells Fargo’s interest in the Investment Fund of $7.5 million. In October 2024, Wells Fargo exercised the put option, and as such the Company recognized a gain on the extinguishment of the liability representing Wells Fargo’s interest in the Investment Fund of $1.3 million.

Benefit Plans

Benefit Plans	12 Months Ended
	Dec. 28, 2024
Retirement Benefits [Abstract]
Benefit Plans	Benefit Plans Pension and Other Postretirement Plans The Company sponsors several qualified and nonqualified pension plans and other postretirement benefit plans for certain employees. The information disclosed below does not include the pension plan in South Korea, as it is immaterial to the Company’s Consolidated Financial Statements. The following tables provide a reconciliation of the changes in the most significant plans’ benefit obligations and the fair value of the plans’ assets for 2024 and 2023, and a statement of the plans’ aggregate funded status: Pension Benefits Other Benefits (In thousands) 2024 2023 2024 2023 Change in benefit obligation: Obligation at beginning of year $ 54,435 $ 50,761 $ 9,557 $ 9,240 Service cost — — 202 183 Interest cost 2,337 2,454 497 439 Actuarial (gain) loss (5,245) 1,508 (604) (105) Plan amendments/transference — — — 101 Benefit payments (3,263) (3,582) (664) (686) Foreign currency translation adjustment (487) 3,294 (671) 385 Obligation at end of year 47,777 54,435 8,317 9,557 Change in fair value of plan assets: Fair value of plan assets at beginning of year 62,871 62,298 — — Actual return on plan assets (7,788) 410 — — Employer contributions — — 664 686 Benefit payments (3,263) (3,582) (664) (686) Foreign currency translation adjustment (780) 3,745 — — Fair value of plan assets at end of year 51,040 62,871 — — Funded (underfunded) status at end of year $ 3,263 $ 8,436 $ (8,317) $ (9,557) The following represents amounts recognized in AOCI (before the effect of income taxes): Pension Benefits Other Benefits (In thousands) 2024 2023 2024 2023 Unrecognized net actuarial loss (gain) $ 12,617 $ 7,728 $ (3,863) $ (3,863) Unrecognized prior service credit — — (6) (5) As of December 28, 2024, $0.3 million of the actuarial net loss and the prior service credit will, through amortization, be recognized as components of net periodic benefit cost in 2025. The aggregate status of all overfunded plans is recognized as an asset and the aggregate status of all underfunded plans is recognized as a liability in the Consolidated Balance Sheets. The amounts recognized as a liability are classified as current or long-term on a plan-by-plan basis. Liabilities are classified as current to the extent the actuarial present value of benefits payable within the next 12 months exceeds the fair value of plan assets, with all remaining amounts classified as long-term. As of December 28, 2024 and December 30, 2023, the total funded status of the plans recognized in the Consolidated Balance Sheets was as follows: Pension Benefits Other Benefits (In thousands) 2024 2023 2024 2023 Long-term asset $ 3,263 $ 8,436 $ — $ — Current liability $ — $ — $ (926) $ (1,041) Long-term liability — — (7,391) (8,516) Total funded (underfunded) status $ 3,263 $ 8,436 $ (8,317) $ (9,557) The components of net periodic benefit cost (income) are as follows: (In thousands) 2024 2023 2022 Pension benefits: Interest cost $ 2,337 $ 2,454 $ 1,272 Expected return on plan assets (2,357) (3,260) (3,568) Amortization of net loss 132 — 897 Net periodic benefit cost (income) $ 112 $ (806) $ (1,399) Other benefits: Service cost $ 202 $ 183 $ 291 Interest cost 497 439 346 Amortization of prior service credit (1) (2) (198) Amortization of net gain (391) (449) (220) Curtailment gain — — (1,756) Net periodic benefit cost (income) $ 307 $ 171 $ (1,537) The components of net periodic benefit cost (income) other than the service cost component are included in other income, net in the Consolidated Statements of Income. The weighted average assumptions used in the measurement of the Company’s benefit obligations are as follows: Pension Benefits Other Benefits 2024 2023 2024 2023 Discount rate 5.30 % 4.40 % 6.51 % 5.96 % Expected long-term return on plan assets 5.30 % 4.30 % N/A N/A Rate of compensation increases N/A N/A 5.00 % 5.00 % Rate of inflation 3.30 % 3.20 % N/A N/A The weighted average assumptions used in the measurement of the Company’s net periodic benefit cost are as follows: Pension Benefits Other Benefits 2024 2023 2022 2024 2023 2022 Discount rate 4.40 % 4.80 % 1.90 % 5.96 % 6.08 % 3.73 % Expected long-term return on plan assets 4.30 % 5.51 % 4.96 % N/A N/A N/A Rate of compensation increases N/A N/A N/A 5.00 % 5.00 % 5.00 % Rate of inflation 3.20 % 3.30 % 3.70 % N/A N/A N/A The Company’s Mexican postretirement plans use the rate of compensation increase in the benefit formulas. Past service in the Wednesbury Pension Scheme (U.K. pension plan) will be adjusted for the effects of inflation. All other pension and postretirement plans use benefit formulas based on length of service. The annual assumed rate of increase in the per capita cost of covered benefits (i.e., health care cost trend rate) is assumed to range from 5.1 to 9.7 percent for 2025, gradually decrease to 4.1 percent through 2040, and remain at that level thereafter. The health care cost trend rate assumption does not have a significant effect on the amounts reported. Pension Assets In October 2024, the Trustees of the U.K. pension plan entered into an agreement with Just Retirement Limited to acquire an insurance policy that operates as an investment asset, with the intent of matching the remaining uninsured part of the U.K. pension plan’s future cash outflow arising from the accrued pension liabilities of members. Such an arrangement is commonly termed as a “buy-in.” The benefit obligation was not transferred to the insurer, and the Company remains responsible for paying pension benefits. The initial value of the asset associated with this contract was equal to the premium paid to secure the contract and is adjusted each reporting period to reflect the estimated fair value of the premium that would be paid for such a contract at that time. The buy-in reduces the U.K. pension plan’s value at risk in relation to key risks associated with improved longevity, inflation, and interest rate movements while improving the security to the U.K. pension plan and its members. The Company consequently benefits from the buy-in as it reduces the U.K. pension plan’s potential reliance on the Company for future cash funding requirements. Following the buy-in, the U.K. pension plan does not need to follow an investment strategy. The discount rate used represents the annualized yield based on a cash flow matched methodology with reference to an AA corporate bond spot curve and having regard to the duration of the U.K. pension plan’s liabilities. The weighted average asset allocation of the Company’s pension fund assets are as follows: Pension Plan Assets Asset category 2024 2023 Pooled liability investments 5 % 99 % Buy-in contract 94 — Cash and equivalents (includes money market funds) 1 1 Total 100 % 100 % The Company’s investments for its pension plans are reported at fair value. The following methods and assumptions were used to estimate the fair value of the Company’s plan asset investments: Cash and money market funds – Valued at cost, which approximates fair value. Pooled liability investments – These funds are primarily invested in U.K. government bonds and highly rated corporate bonds. The level 2 fair value is determined utilizing observable inputs of the underlying assets. Buy-in contract – This consists of a U.K. buy-in insurance contract set to equal an actuarially calculated present value of the underlying liabilities. Its fair value is classified as level 3. The following table sets forth by level, within the fair value hierarchy, the assets of the plans at fair value: Fair Value Measurements at December 28, 2024 (In thousands) Level 1 Level 2 Level 3 Total Cash and money market funds $ 682 $ — $ — $ 682 Pooled liability investments — 2,581 — 2,581 Buy-in contract — — 47,777 47,777 Total $ 682 $ 2,581 $ 47,777 $ 51,040 Fair Value Measurements at December 30, 2023 (In thousands) Level 1 Level 2 Level 3 Total Cash and money market funds $ 502 $ — $ — $ 502 Pooled liability investments — 62,369 — 62,369 Total $ 502 $ 62,369 $ — $ 62,871 The table below reflects the changes in the assets of the plan measured at fair value on a recurring basis using significant unobservable inputs (level 3 of fair value hierarchy) during the year ended December 28, 2024: (In thousands) Buy-In Contract Balance, December 30, 2023 $ — Purchases 47,777 Balance, December 28, 2024 $ 47,777 Contributions and Benefit Payments The Company does not expect to contribute to the U.K. pension plan, other than to reimburse expenses, and expects to contribute $0.9 million to its other postretirement benefit plans in 2025. The Company expects future benefits to be paid from the plans as follows: (In thousands) Pension Benefits Other Benefits 2025 $ 3,612 $ 926 2026 3,742 951 2027 3,875 772 2028 4,015 833 2029 4,159 760 2030-2034 23,135 3,876 Total $ 42,538 $ 8,118 401(k) Plans The Company sponsors voluntary employee savings plans that qualify under Section 401(k) of the Internal Revenue Code of 1986. Compensation expense for the Company’s matching contribution to the 401(k) plans was $5.0 million in 2024, $4.9 million in 2023, and $4.9 million in 2022. The Company match is a cash contribution. Participants direct the investment of their account balances by allocating among a range of asset classes including mutual funds (equity, fixed income, and balanced funds) and money market funds. The plans do not allow direct investment in securities issued by the Company. Multiemployer Plan On August 2, 2024 the Company entered into an equity purchase agreement to acquire all of the outstanding shares of Elkhart. Elkhart contributes to the IAM National Pension Fund (IAM Plan). The Employer Identification Number for this plan is 51-6031295. The risks of participating in multiemployer plans are different from single-employer plans in the following aspects: (i) assets contributed to the multiemployer plan by one employer may be used to provide benefits to employees of other participating employers; (ii) if a participating employer stops contributing to the plan, the underfunded obligations of the plan may be borne by the remaining participating employers; (iii) if the Company chooses to stop participating in the plan, the Company may be required to pay the plan an amount based on the underfunded status of the plan, referred to as a withdrawal liability. The Company makes contributions to the IAM Plan trusts that cover certain union employees; contributions by employees are not permitted. Contributions to the IAM Plan were approximately $0.2 million in 2024. The Company’s contributions are less than five percent of total employer contributions made to the IAM Plan indicated in the most recently filed Form 5500. Under the Pension Protection Act of 2006, the IAM Plan’s actuary must certify the plan’s zone status annually. Plans in the red zone are generally less than 65 percent funded, plans in the yellow zone are less than 80 percent funded, and plans in the green zone are at least 80 percent funded. If a plan is determined to be in endangered status, red zone or yellow zone, the plan’s trustees must develop a formal plan of corrective action, a Financial Improvement Plan and/or a Rehabilitation Plan. For 2024, the IAM Plan remained in the red zone due to the trustees’ election to voluntarily place the fund in critical status in 2019 to strengthen its funding position. The fund has remained in critical status since that election and is not projected to emerge from critical status in the upcoming year.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 28, 2024
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Environmental The Company is subject to federal, state, local, and foreign environmental laws and regulations. For all properties, the Company has provided and charged to expense $1.8 million in 2024, $0.7 million in 2023, and $1.4 million in 2022 for pending environmental matters. Environmental reserves Non-operating Properties Southeast Kansas Sites The Kansas Department of Health and Environment (KDHE) has contacted the Company regarding environmental contamination at three former smelter sites in Kansas (Altoona, East La Harpe, and Lanyon). The Company is not a successor to the companies that operated these smelter sites, but has explored possible settlement with KDHE and other potentially responsible parties (PRP) in order to avoid litigation. In February 2022, the Company reached a settlement with another PRP relating to these three sites. Under the terms of that agreement, the Company paid $5.6 million, which was previously reserved, in exchange for the other PRP’s agreement to conduct or fund any required remediation with the geographic boundaries of the three sites (namely, the parcel(s) on which the former smelters were located), plus coverage of certain off-site areas (namely, contamination that migrated by surface water runoff or air emissions from the Altoona or East La Harpe site, and smelter materials located within 50 feet of the geographic boundary of each site). The settlement does not cover certain matters, including potential liability related to the remediation of the town of Iola which is not estimable at this time. The other PRP has also provided an indemnity that would cover third-party cleanup claims for those sites, subject to a time limit and a cap. Altoona. Another PRP conducted a site investigation of the Altoona site under a consent decree with KDHE and submitted a removal site evaluation report recommending a remedy. The remedial design plan, which covers both on-site and certain off-site cleanup costs, was approved by the KDHE in 2016. Construction of the remedy was completed in 2018. Under the terms of the settlement with the other PRP, the Company expects the operations and maintenance costs for this remedy to be paid for entirely by the other PRP. East La Harpe. At the East La Harpe site, the Company and two other PRPs conducted a site study evaluation under KDHE supervision and prepared a site cleanup plan approved by KDHE. In December 2018, KDHE provided a draft agreement which contemplates the use of funds KDHE obtained from two other parties (Peabody Energy and Blue Tee) to fund part of the remediation, and removes Blue Tee from the PRPs’ agreement with KDHE. Pursuant to the terms of the settlement with the other PRP noted above, the Company expects the remediation to be conducted and paid for entirely by the other PRP, and for that other PRP to negotiate and enter into an agreement with KDHE. Lanyon. With respect to the Lanyon Site, in 2016, the Company received a general notice letter from the United States Environmental Protection Agency (EPA) asserting that the Company is a PRP, which the Company has denied. EPA issued an interim record of decision in 2017 and has been remediating properties at the site. According to EPA, 1,371 properties were to be remediated. In August 2023, EPA issued a five-year review indicating that the cleanup of approximately 300 remaining residential properties would be completed in 2026. A record of decision concerning the cleanup is scheduled for May 2025. Shasta Area Mine Sites Mining Remedial Recovery Company (MRRC), a wholly owned subsidiary, owns certain inactive mines in Shasta County, California. MRRC has continued a program, begun in the late 1980s, of implementing various remedial measures, including sealing mine portals with concrete plugs in portals that were discharging water. The sealing program achieved significant reductions in the metal load in discharges from these adits; however, additional reductions are required pursuant to an order issued by the California Regional Water Quality Control Board (QCB). In response to a 1996 QCB Order, MRRC completed a feasibility study in 1997 describing measures designed to mitigate the effects of acid rock drainage. In December 1998, the QCB modified the 1996 order extending MRRC’s time to comply with water quality standards. In September 2002, the QCB adopted a new order requiring MRRC to adopt Best Management Practices (BMP) to control discharges of acid mine drainage, and again extended the time to comply with water quality standards until September 2007. During that time, implementation of BMP further reduced impacts of acid rock drainage; however, full compliance has not been achieved. The QCB is presently renewing MRRC’s discharge permit and will concurrently issue a new order. It is expected that the new 10-year permit will include an order requiring continued implementation of BMP through 2034 to address residual discharges of acid rock drainage. At this site, MRRC spent approximately $1.3 million from 2022 through 2024 for remediation, and currently estimates that it will spend between approximately $13.2 million and $14.9 million over the next 30 years and has accrued a reserve at the low end of this range. Lead Refinery Site U.S.S. Lead Refinery, Inc. (Lead Refinery), a non-operating wholly owned subsidiary of MRRC, has conducted corrective action and interim remedial activities (collectively, Site Activities) at Lead Refinery’s East Chicago, Indiana site pursuant to the Resource Conservation and Recovery Act since December 1996. Although the Site Activities have been substantially concluded, Lead Refinery is required to perform monitoring and maintenance-related activities pursuant to a post-closure permit issued by the Indiana Department of Environmental Management effective as of March 2, 2013. Lead Refinery spent approximately $0.7 million from 2022 through 2024 with respect to this site. Approximate costs to comply with the post-closure permit, including associated general and administrative costs, are estimated at between $2.3 million and $2.7 million over the next 12 years. The Company has recorded a reserve at the low end of this range. On April 9, 2009, pursuant to the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), the U.S. Environmental Protection Agency (EPA) added the Lead Refinery site and surrounding properties to the National Priorities List (NPL). On July 17, 2009, Lead Refinery received a written notice from the EPA indicating that it may be a PRP under CERCLA due to the release or threat of release of hazardous substances including lead into properties surrounding the Lead Refinery NPL site. The EPA identified two other PRPs in connection with that matter. In November 2012, the EPA adopted a remedy for the surrounding properties and in September 2014, the EPA announced that it had entered into a settlement with the two other PRPs whereby they will pay approximately $26.0 million to fund the cleanup of approximately 300 properties surrounding the Lead Refinery NPL site (zones 1 and 3 of operable unit 1) and perform certain remedial action tasks. On November 8, 2016, the Company, its subsidiary Arava Natural Resources Company, Inc. (Arava), and Arava’s subsidiary MRRC each received general notice letters from the EPA asserting that they may be PRPs in connection with the Lead Refinery NPL site. The Company, Arava, and MRRC have denied liability for any remedial action and response costs associated with the Lead Refinery NPL site. In June 2017, the EPA requested that Lead Refinery conduct, and the Company fund, a remedial investigation and feasibility study (RI/FS) of operable unit 2 of the Lead Refinery NPL site pursuant to a proposed administrative settlement agreement and order on consent. The Company and Lead Refinery entered into that agreement in September 2017. The Company has made a capital contribution to Lead Refinery to conduct the RI/FS with respect to operable unit 2 and has provided financial assurance in the amount of $1.0 million. The RI/FS remains ongoing, and the Company has reserved currently estimated costs associated with its completion. The EPA has also asserted its position that the Company is a responsible party for the Lead Refinery NPL site, and accordingly is responsible for a share of remedial action and response costs at both operable units 1 and 2 of the site. In January 2018, the EPA issued two unilateral administrative orders (UAOs) directing the Company, Lead Refinery, and four other PRPs to conduct soil and interior remediation of certain residences at the Lead Refinery NPL site (zones 2 and 3 of operable unit 1). Subsequent thereto, the Company and Lead Refinery reached agreement with the four other PRPs to implement these two UAOs, with the Company agreeing to pay, on an interim basis, (i) an estimated $4.5 million (subject to potential change through a future reallocation process) of the approximately $25.0 million the PRPs then estimated it would cost to implement the UAOs, which estimate is subject to change, and (ii) $2.0 million relating to past costs incurred by other PRPs for work conducted at the site, as well as the possibility of up to $0.7 million in further payments for ongoing work by those PRPs. As of year-end, the Company has made payments of approximately $7.6 million related to the aforementioned agreement with the other PRPs. The Company disputes that it was properly named in the UAOs. In March 2022, Lead Refinery entered into an administrative settlement agreement and order on consent with the EPA, along with the four other PRPs, which involves payment of certain past and future costs relating to operable unit 1, in exchange for certain releases and contribution protection for the Company, Lead Refinery, and their respective affiliates relating to that operable unit. The settlement became effective in September 2022. The Company reserved $3.3 million for this settlement at the end of 2021. In March 2018, a group of private plaintiffs sued the Company, Arava, MRRC, and Lead Refinery, along with other defendants, in civil tort action relating to the site. The Company, Arava, and MRRC have been voluntarily dismissed from that litigation without prejudice. In July 2024, Lead Refinery was granted partial judgment on the pleadings with respect to plaintiffs’ amended complaint and settled the litigation for a payment of approximately $0.1 million. At this juncture, the Company is unable to determine the likelihood of a material adverse outcome or the amount or range of a potential loss in excess of the current reserve with respect to any remedial action or other litigation relating to the Lead Refinery NPL site, either at Lead Refinery’s former operating site (operable unit 2) or the adjacent residential area (operable unit 1), including, but not limited to, EPA oversight costs for which the EPA may attempt to seek reimbursement from the Company, and past costs for which other PRPs may attempt to seek contribution from the Company. Bonita Peak Mining District Following an August 2015 spill from the Gold King Mine into the Animas River near Silverton, Colorado, the EPA listed the Bonita Peak Mining District on the NPL. Said listing was finalized in September 2016. The Bonita Peak Mining District encompasses 48 mining sites within the Animas River watershed, including the Sunnyside Mine, the American Tunnel, and the Sunbank Group. On or about July 25, 2017, Washington Mining Company (Washington Mining) (a wholly-owned subsidiary of the Company’s wholly-owned subsidiary, Arava), received a general notice letter from the EPA stating that Washington Mining may be a PRP under CERCLA in connection with the Bonita Peak Mining District site and therefore responsible for the remediation of certain portions of the site, along with related costs incurred by the EPA. Shortly thereafter, the Company received a substantively identical letter asserting that it may be a PRP at the site and similarly responsible for the cleanup of certain portions of the site. On or about January 7, 2025, a similar general notice letter from EPA was received by Mining Remedial Recovery Company (MRRC) (also a wholly-owned subsidiary of Arava), stating that MRRC may be a PRP at the site. Collectively, the general notice letters identify three other PRPs at the site, and while the U.S. government and State of Colorado have expressed their interest in discussing potential cost recovery claims against Washington Mining, MRRC and/or the Company in early 2025, at this juncture, no specific actions have yet been required and the Company is unable to determine the likelihood of a materially adverse outcome or the amount or range of a potential loss with respect to any litigation (including any enforcement action by the U.S. or any state) or remedial action related to the Bonita Peak Mining District NPL site. Operating Properties Mueller Copper Tube Products, Inc. In 1999, Mueller Copper Tube Products, Inc. (MCTP), a wholly owned subsidiary, commenced a cleanup and remediation of soil and groundwater at its Wynne, Arkansas plant to remove trichloroethylene, a cleaning solvent formerly used by MCTP. On August 30, 2000, MCTP received approval of its Final Comprehensive Investigation Report and Storm Water Drainage Investigation Report addressing the treatment of soils and groundwater from the Arkansas Department of Environmental Quality (ADEQ). The Company established a reserve for this project in connection with the acquisition of MCTP in 1998. Effective November 17, 2008, MCTP entered into a Settlement Agreement and Administrative Order by Consent to submit a Supplemental Investigation Work Plan (SIWP) and subsequent Final Remediation Work Plan (RWP) for the site. By letter dated January 20, 2010, ADEQ approved the SIWP as submitted, with changes acceptable to the Company. On December 16, 2011, MCTP entered into an amended Administrative Order by Consent to prepare and implement a revised RWP regarding final remediation for the Site. The remediation system was activated in February 2014. Costs to implement the work plans, including associated general and administrative costs, are estimated to approximate $0.3 million over the next year. United States Department of Commerce Antidumping Review On December 24, 2008, the Department of Commerce (DOC) initiated an antidumping administrative review of the antidumping duty order covering circular welded non-alloy steel pipe and tube from Mexico for the November 1, 2007 through October 31, 2008 period of review. The DOC selected Mueller Comercial as a respondent in the review. On April 19, 2010, the DOC published the final results of the review and assigned Mueller Comercial an antidumping duty rate of 48.33 percent. On May 25, 2010, the Company appealed the final results to the U.S. Court of International Trade (CIT). On December 16, 2011, the CIT issued a decision remanding the Department’s final results. While the matter was still pending, the Company and the United States reached an agreement to settle the appeal. Subject to the conditions of the agreement, the Company anticipated that certain of its subsidiaries would incur antidumping duties on subject imports made during the period of review and, as such, established a reserve for this matter. After the lapse of the statutory period of time during which U.S. Customs and Border Protection (CBP) was required, but failed, to liquidate the entries at the settled rate, the Company released the reserve. Between October 30, 2015 and November 27, 2015, CBP sent a series of invoices to Southland Pipe Nipples Co., Inc. (Southland), requesting payment of approximately $3.0 million in duties and interest in connection with 795 import entries made during the November 1, 2007 through October 31, 2008 period. On January 26, 2016 and January 27, 2016, Southland filed protests with CBP in connection with these invoices, noting that CBP’s asserted claims were not made in accordance with applicable law, including statutory provisions governing deemed liquidation. The Company believes in the merits of the legal objections raised in Southland’s protests, and CBP’s response to Southland’s protests is currently pending. Given the procedural posture and issues raised by this legal dispute, the Company cannot estimate the amount of potential duty liability, if any, that may result from CBP’s asserted claims. Guarantees Guarantees, in the form of letters of credit, are issued by the Company generally to assure the payment of insurance deductibles, certain retiree health benefits, and debt at certain unconsolidated affiliates. The terms of the guarantees are generally one year but are renewable annually as required. These letters are primarily backed by the Company’s revolving credit facility. The maximum payments that the Company could be required to make under its guarantees at December 28, 2024 were $28.8 million. Insurance Claims In August 2022, a portion of the Company’s Bluffs, Illinois manufacturing operation was damaged by fire. Certain inventories, production equipment, and building structures were extensively damaged. During the second quarter of 2023, the Company settled the claim with its insurer for total proceeds of $29.5 million, net of the deductible of $250 thousand. As a result of the settlement with the insurer, all proceeds received and all costs previously deferred (which were recorded as other current liabilities in prior periods) were recognized, resulting in a pre-tax gain of $19.5 million in the second quarter of 2023, or 13 cents per diluted share after tax. The Company received proceeds of $24.5 million and $5.0 million in 2023 and 2022, respectively. In March 2023, a portion of the Company’s Covington, Tennessee manufacturing operation was damaged by a tornado. The extent of the damage to inventories, production equipment, and building structures is currently being assessed. The total value of the loss, including business interruption, cannot be determined at this time, but is expected to be covered by property and business interruption insurance subject to customary deductibles. Any gain resulting from insurance proceeds for property damage in excess of the net book value of the related property will be recognized in income upon settlement of the claim. In addition, the Company has deferred recognition of direct, identifiable costs associated with this matter. These costs will also be recognized upon settlement of the insurance claim. As of December 28, 2024, the Company has received advances totaling $35.0 million from the insurance company for this claim, of which $25.0 million was received during 2024. These advances, net of the book value of damaged inventories, equipment, and buildings and direct cleanup and other out of pocket costs totaled $21.6 million, are classified as other current liabilities on the Consolidated Balance Sheet at December 28, 2024. Other The Company is involved in certain litigation as a result of claims that arose in the ordinary course of business, which management believes will not have a material adverse effect on the Company’s financial position, results of operations, or cash flows. It may also realize the benefit of certain legal claims and litigation in the future; these gain contingencies are not recognized in the Consolidated Financial Statements.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 28, 2024
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The components of income before income taxes were taxed under the following jurisdictions: (In thousands) 2024 2023 2022 Domestic $ 672,625 $ 722,153 $ 737,538 Foreign 147,837 123,079 138,493 Income before income taxes $ 820,462 $ 845,232 $ 876,031 Income tax expense consists of the following: (In thousands) 2024 2023 2022 Current tax expense: Federal $ 136,248 $ 144,111 $ 149,269 Foreign 37,269 39,167 36,719 State and local 32,426 32,694 41,214 Current tax expense 205,943 215,972 227,202 Deferred tax (benefit) expense: Federal 1,617 4,806 (3,312) Foreign 3,285 270 (192) State and local (5,769) (286) (376) Deferred tax (benefit) expense (867) 4,790 (3,880) Income tax expense $ 205,076 $ 220,762 $ 223,322 The difference between the reported income tax expense and a tax determined by applying the applicable U.S. federal statutory income tax rate to income before income taxes is reconciled as follows: (In thousands) 2024 2023 2022 Expected income tax expense $ 172,297 $ 177,499 $ 183,967 State and local income tax, net of federal benefit 19,847 25,542 32,184 Effect of foreign statutory rates different from U.S. and other foreign adjustments 9,308 14,519 7,443 Investment in unconsolidated affiliates 2,114 1,226 206 Other, net 1,510 1,976 (478) Income tax expense $ 205,076 $ 220,762 $ 223,322 The Company continues to assert that a portion of the undistributed earnings of its foreign subsidiaries are permanently reinvested. No taxes have been accrued with respect to these undistributed earnings or any outside basis differences. The Company has accrued appropriate taxes for any undistributed earnings that are not considered permanently reinvested. The Company has elected to provide for the tax expense related to global intangible low-taxed income (GILTI) in the year the tax is incurred. The international tax framework introduced by the Organisation for Economic Co-operation and Development under its Pillar Two initiative includes a global minimum tax of 15 percent. Legislation adopting these provisions has been enacted in certain jurisdictions where the Company operates and is effective for the Company's 2024 fiscal year. The Company has assessed this legislation, and the Pillar Two provisions do not have a material impact on the Company’s income tax expense. The Company includes interest and penalties related to income tax matters as a component of income tax expense, none of which was material in 2024, 2023, and 2022. The statute of limitations is open for the Company’s federal tax return for 2021 and all subsequent years. Some state and foreign returns are open for 2021 and all subsequent years, and some state and foreign returns are also open for some earlier tax years due to differing statute periods. While the Company believes that it is adequately reserved for possible audit adjustments, the final resolution of these examinations cannot be determined with certainty and could result in final settlements that differ from current estimates. The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities are presented below: (In thousands) 2024 2023 Deferred tax assets: Inventories $ 17,296 $ 19,162 Other postretirement benefits and accrued items 16,202 10,174 Other reserves 6,870 6,956 Foreign tax attributes 4,676 4,862 State tax attributes, net of federal benefit 3,932 6,728 Stock-based compensation 5,100 4,502 Lease liability 6,230 7,354 Basis difference in unconsolidated affiliates 11,649 11,509 Total deferred tax assets 71,955 71,247 Less valuation allowance (16,692) (23,078) Deferred tax assets, net of valuation allowance 55,263 48,169 Deferred tax liabilities: Property, plant, and equipment 52,405 42,980 Lease asset 6,670 7,776 Other liabilities 10,198 10,884 Total deferred tax liabilities 69,273 61,640 Net deferred tax liabilities $ (14,010) $ (13,471) As of December 28, 2024, the Company had state net operating loss (NOL) carryforwards with potential tax benefits of $3.9 million, after consideration of the federal impact, expiring between 2032 and 2036. As of December 28, 2024, the Company had other foreign tax attributes with potential tax benefits of $3.6 million, which have an unlimited life, and attributes with potential benefits of $1.1 million that expire between 2036 and 2040; all of these foreign attributes were fully offset by a valuation allowance. The Company has also recorded a valuation allowance against deferred tax assets related to the basis differences in investments in unconsolidated affiliates. Income taxes paid were approximately $210.4 million in 2024, $219.6 million in 2023, and $238.3 million in 2022.

Equity

Equity	12 Months Ended
	Dec. 28, 2024
Equity [Abstract]
Equity	Equity The Company’s Board of Directors has extended, until July 2026, its authorization to repurchase up to 40 million shares of the Company’s common stock through open market transactions or through privately negotiated transactions. The Company has no obligation to purchase any shares and may cancel, suspend, or extend the time period for the purchase of shares at any time. Any purchases will be funded primarily through existing cash and cash from operations. The Company may hold any shares purchased in treasury or use a portion of the repurchased shares for its stock-based compensation plans, as well as for other corporate purposes. From its initial authorization in 1999 through December 28, 2024, the Company has repurchased approximately 15.9 million shares under this authorization.

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 28, 2024
Share-Based Payment Arrangement [Abstract]
Stock-Based Compensation	Stock-Based Compensation The Company has in effect stock incentive plans under which stock-based awards have been granted to certain employees and members of its Board of Directors. Under these existing plans, the Company may grant stock options, restricted stock awards, and performance stock awards. Approximately 4.1 million shares were available for future stock incentive awards at December 28, 2024. During the years ended December 28, 2024, December 30, 2023, and December 31, 2022, the Company recognized stock-based compensation, as a component of selling, general, and administrative expense, in its Consolidated Statements of Income of $26.8 million, $23.1 million, and $17.8 million, respectively. The total compensation expense not yet recognized related to stock incentive awards at December 28, 2024 was $54.1 million, with an average expense recognition period of 2.7 years. The Company generally issues treasury shares when stock options are exercised, or when restricted stock awards or performance stock awards are granted. A summary of the activity and related information follows: Stock Options Restricted Stock Awards Performance Stock Awards (Shares in thousands) Shares Weighted Average Exercise Price Shares Weighted Average Grant Date Fair Value Shares Weighted Average Grant Date Fair Value Beginning of period 626 $ 14.78 664 $ 20.51 1,902 $ 27.63 Granted — N/A 71 62.91 370 64.52 Added by Performance Factor — N/A — N/A 283 21.73 Exercised/Released (204) 13.52 (273) 17.51 (806) 19.59 Forfeited — N/A (7) 26.39 (10) 14.61 End of period 422 $ 15.39 455 $ 28.83 1,739 $ 38.33 Restricted Stock Awards The fair value of each restricted stock award equals the fair value of the Company’s stock on the grant date and is amortized into compensation expense on a straight-line or accrual basis over its vesting period based on its vesting schedule. The weighted average grant-date fair value of awards granted during 2024, 2023, and 2022 was $62.91, $36.88, and $31.90, respectively. The aggregate intrinsic value of outstanding and unvested awards was $36.3 million at December 28, 2024. The total fair value of awards that vested was $4.8 million, $7.7 million, and $4.9 million in 2024, 2023, and 2022, respectively. Performance Stock Awards Performance stock awards require achievement of certain performance criteria which are predefined by the Compensation Committee of the Board of Directors at the time of grant. The fair value of each performance stock award equals the fair value of the Company’s stock on the grant date. Performance stock awards are vested and released at the end of the performance period if the predefined performance criteria are achieved. For all performance stock awards, in the event the certified results equal the predefined performance criteria, the Company will grant the number of shares equal to the target award. In the event the certified results exceed the predefined performance criteria, additional shares up to the maximum award will be granted. In the event the certified results fall below the predefined performance criteria but above the minimum threshold, a reduced number of shares will be granted. If the certified results fall below the minimum threshold, no shares will be granted. In the period it becomes probable that the minimum threshold specified in the award will be achieved, the Company recognizes expense for the proportionate share of the total fair value of the performance stock awards related to the vesting period that has already lapsed for the shares expected to vest and be released. The remaining fair value of the shares expected to vest and be released is expensed on a straight-line basis over the balance of the vesting period. In the event the Company determines it is no longer probable that it will achieve the minimum threshold specified in the award, all of the previously recognized compensation expense is reversed in the period such a determination is made. The weighted average grant-date fair value of awards granted during 2024, 2023, and 2022 was $64.52, $37.63, and $32.74, respectively. The aggregate intrinsic value of outstanding and unvested awards was $139.0 million at December 28, 2024. The total fair value of awards that vested was $15.8 million and $7.0 million in 2024 and 2023, respectively. Stock Options Stock options are generally granted to purchase shares of common stock at an exercise price equal to the average of the high and low market price of the Company’s stock on the grant date. Generally, the awards vest within five years from the grant date. Any unexercised options expire after not more than ten years. The fair value of each option is estimated as a single award and amortized into compensation expense on a straight-line or accrual basis over its vesting period based on its vesting schedule. There were no stock options granted in 2022, 2023, or 2024. The total intrinsic value of stock options exercised was $9.4 million, $6.5 million, and $5.9 million in 2024, 2023, and 2022, respectively. The total fair value of stock options that vested was $1.0 million and $1.1 million in 2023 and 2022, respectively. No stock options vested in 2024.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	12 Months Ended
	Dec. 28, 2024
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) AOCI includes certain foreign currency translation adjustments from those subsidiaries not using the U.S. dollar as their functional currency, net deferred gains and losses on certain derivative instruments accounted for as cash flow hedges, adjustments to pension and other post-employment benefit liabilities, and other comprehensive income attributable to unconsolidated affiliates. The following table provides changes in AOCI by component, net of taxes and noncontrolling interest (amounts in parentheses indicate debits to AOCI): (In thousands) Cumulative Translation Adjustment Unrealized Gain (Loss) on Derivatives Pension/ Attributable to Unconsol. Affiliates Total Balance at December 31, 2022 $ (69,238) $ 1,486 $ 1,222 $ 2,355 $ (64,175) Other comprehensive income (loss) before reclassifications 21,162 1,146 (3,499) 917 19,726 Amounts reclassified from AOCI — (2,419) (353) — (2,772) Balance at December 30, 2023 (48,076) 213 (2,630) 3,272 (47,221) Other comprehensive (loss) income before reclassifications (27,850) 182 (3,449) (1,152) (32,269) Amounts reclassified from AOCI — (586) (203) — (789) Balance at December 28, 2024 $ (75,926) $ (191) $ (6,282) $ 2,120 $ (80,279) Reclassification adjustments out of AOCI were as follows: Amount reclassified from AOCI (In thousands) 2024 2023 2022 Affected Line Item Unrealized losses (gains) on derivatives: Commodity contracts $ (745) $ (3,109) $ 9,891 Cost of goods sold 159 690 (2,225) Income tax expense (benefit) $ (586) $ (2,419) $ 7,666 Net of tax and noncontrolling interests Amortization of net loss (gain) and prior service cost on employee benefit plans $ (260) $ (451) $ (1,277) Other (expense) income, net 57 98 332 Income tax expense $ (203) $ (353) $ (945) Net of tax and noncontrolling interests

Quarterly Financial Information

Quarterly Financial Information (Unaudited)	12 Months Ended
	Dec. 28, 2024
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Information (Unaudited)	Quarterly Financial Information (Unaudited) (1) (In thousands, except per share data) First Second Third Fourth 2024 Net sales $ 849,654 $ 997,745 $ 997,831 $ 923,536 Gross profit (2) 240,951 272,755 275,362 255,370 Consolidated net income 141,709 163,447 171,783 140,603 Net income attributable to Mueller Industries, Inc. 138,363 160,165 168,699 137,652 Basic earnings per share 1.24 1.44 1.51 1.23 Diluted earnings per share 1.21 1.41 1.48 1.21 Dividends per share 0.20 0.20 0.20 0.20 2023 Net sales $ 971,192 $ 896,984 $ 819,792 $ 732,377 Gross profit (2) 292,394 257,712 240,734 195,994 Consolidated net income 175,093 179,551 135,709 119,296 Net income attributable to Mueller Industries, Inc. 173,239 177,711 132,709 119,238 Basic earnings per share 1.56 1.60 1.19 1.07 Diluted earnings per share 1.54 1.56 1.17 1.05 Dividends per share 0.15 0.15 0.15 0.15 (1) The sum of quarterly amounts may not equal the annual amounts reported due to rounding. In addition, the earnings per share amounts are computed independently for each quarter, while the full year is based on the weighted average shares outstanding. (2) Gross profit is net sales less cost of goods sold, which excludes depreciation and amortization.

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 28, 2024
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions The non-controlling interest in the Company’s South Korean joint venture owns 100 percent of a copper tube mill which supplies Mueller affiliates. These affiliates purchased $19.0 million and $15.5 million of product from the supplier in 2024 and 2023, respectively. Payables related to these sales as of December 28, 2024 were $0.5 million.

Schedule II - Valuation And Qua

Schedule II - Valuation And Qualifying Accounts	12 Months Ended
	Dec. 28, 2024
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
Schedule II - Valuation And Qualifying Accounts	MUELLER INDUSTRIES, INC. SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS Years Ended December 28, 2024, December 30, 2023, and December 31, 2022 Additions (In thousands) Balance at beginning of year Charged to costs and expenses Other additions Deductions Balance at end 2024 Allowance for doubtful accounts $ 2,830 $ 1,147 $ 5 $ 258 $ 3,724 Environmental reserves $ 18,940 $ 1,785 $ — $ 2,311 $ 18,414 Valuation allowance for deferred tax assets $ 23,078 $ (4,931) $ — $ 1,455 $ 16,692 2023 Allowance for doubtful accounts $ 2,687 $ (84) $ 227 $ — $ 2,830 Environmental reserves $ 20,534 $ 652 $ — $ 2,246 $ 18,940 Valuation allowance for deferred tax assets $ 21,504 $ 4,939 $ 267 $ 3,632 $ 23,078 2022 Allowance for doubtful accounts $ 2,590 $ 323 $ — $ 226 $ 2,687 Environmental reserves $ 27,426 $ 1,367 $ — $ 8,259 $ 20,534 Valuation allowance for deferred tax assets $ 26,624 $ (1,648) $ 509 $ 3,981 $ 21,504

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 28, 2024	Sep. 28, 2024	Jun. 29, 2024	Mar. 30, 2024	Dec. 30, 2023	Sep. 30, 2023	Jul. 01, 2023	Apr. 01, 2023	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Pay vs Performance Disclosure
Net income attributable to Mueller Industries, Inc.	$ 137,652	$ 168,699	$ 160,165	$ 138,363	$ 119,238	$ 132,709	$ 177,711	$ 173,239	$ 604,879	$ 602,897	$ 658,316

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended	12 Months Ended
	Dec. 28, 2024 shares	Dec. 28, 2024 shares
Trading Arrangements, by Individual
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false
Steffen Sigloch [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement		On October 30, 2024, Steffen Sigloch, Chief Manufacturing Officer, entered into a 10b5-1 sales plan (the Sales Plan) intended to satisfy the affirmative defense of Rule 10b5-1(c) under the Exchange Act. The Sales Plan provides for the sale of up to an aggregate of 101,235 shares of the Company’s common stock beneficially owned by Mr. Sigloch during the term of the Sales Plan and will be in effect until the earlier of (1) September 3, 2026 or (2) the date on which an aggregate of 101,235 shares of the Company’s common stock have been sold under the Sales Plan.
Name	Steffen Sigloch
Title	Chief Manufacturing Officer
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	October 30, 2024
Expiration Date	September 3, 2026
Arrangement Duration	673 days
Aggregate Available	101,235	101,235

Insider Trading Policies and Pr

Insider Trading Policies and Procedures	12 Months Ended
	Dec. 28, 2024
Insider Trading Policies and Procedures [Line Items]
Insider Trading Policies and Procedures Adopted	true

Cybersecurity Risk Management a

Cybersecurity Risk Management and Strategy Disclosure	12 Months Ended
	Dec. 28, 2024
Cybersecurity Risk Management, Strategy, and Governance [Line Items]
Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block]	Risk Management and Strategy Our business operations depend on the availability, integrity and secure processing, storage, and transmission of confidential and sensitive information, digitally and through interconnected systems, including those of our vendors, service providers and other third parties on which we rely. Consequently, we maintain a formal data protection program, including physical, technical and administrative safeguards, to prevent and mitigate the risks posed by cybersecurity threats and incidents and to identify, analyze, address, mitigate and remediate those incidents that do occur. As part of our program: • we regularly review and update at least annually our standard policies and procedures related to information technology and analyze those policies against the standards and controls that we believe are most relevant to our Company set by organizations such as the National Institute of Standards and Technology (NIST) cybersecurity framework and the International Organization for Standardization (ISO); • we maintain a dedicated cybersecurity team under the direction of our Chief Information Officer (CIO), who has expertise related to data and network security, data governance and risk management; • we regularly test our internal IT controls; • we regularly conduct internal vulnerability assessments as well as third-party penetration tests; • we maintain, and we require our third-party service providers to maintain, security controls designed to ensure the confidentiality, integrity, and availability of our information systems and the confidential and sensitive information we maintain and process, or which is processed on our behalf; • all employees are required to complete periodic trainings that cover security and privacy best practices and company policies; and • we have prepared and regularly review and test our business continuity, disaster recovery and other back-up plans, including as they relate to cybersecurity incidents. In connection with the design, implementation and testing of our cybersecurity program, we also work, as appropriate, with our accountants, independent assessors, legal counsel and other consultants. We have an incident reporting and escalation process that we believe to be effective in detecting and analyzing cyber incidents as they occur to determine appropriate response action and reporting, including the materiality of any such incidents to our financial condition and operations. This process includes: • continual monitoring of our systems and logs by both internal and outsourced staff; • immediate escalation to and review by our CIO of certain signals, including evidence of external threat actors, ransomware attacks, data exfiltration, identity compromise or unusual requests from management or certain departments; • if deemed appropriate, reporting by our CIO to the Company’s senior leadership, which based on the circumstances, may include executive officers and representatives of our accounting, human resources, finance, information technology and legal functions, and consultation with internal and external legal counsel, for further review and determination of the scope and materiality of the incident or incidents, including whether public disclosure is appropriate or required; and • informing our Board of Directors (the “Board”) of significant or material cybersecurity incidents, as appropriate.
Cybersecurity Risk Management Processes Integrated [Flag]	true
Cybersecurity Risk Management Processes Integrated [Text Block]	Our business operations depend on the availability, integrity and secure processing, storage, and transmission of confidential and sensitive information, digitally and through interconnected systems, including those of our vendors, service providers and other third parties on which we rely. Consequently, we maintain a formal data protection program, including physical, technical and administrative safeguards, to prevent and mitigate the risks posed by cybersecurity threats and incidents and to identify, analyze, address, mitigate and remediate those incidents that do occur.
Cybersecurity Risk Management Third Party Engaged [Flag]	true
Cybersecurity Risk Third Party Oversight and Identification Processes [Flag]	true
Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag]	false
Cybersecurity Risk Board of Directors Oversight [Text Block]	Governance Our Board actively oversees our risk management activities both directly and through its committees and considers various risk topics throughout the year, including cybersecurity and information security risk management and controls. As part of its oversight function, the Audit Committee of the Board oversees the Company’s risk assessment and risk management policies, including related to cybersecurity and the data protection program, and performs an annual review and assessment of the primary operational and regulatory risks facing the Company, their relative magnitude and management’s plan for mitigating these risks. At least annually, our CIO reports to the Audit Committee with a comprehensive report addressing a broad range of topics, including significant cybersecurity incidents that have occurred since the last update, the status of projects and initiatives to update our cybersecurity policies and practices, and ongoing efforts to prevent, detect, and respond to internal and external critical threats. Our senior management is responsible for assessing and managing the Company’s various exposures to risk, including those related to cybersecurity, on a day-to-day basis, including the identification of risks through a robust enterprise risk management framework and the creation of appropriate risk management programs and policies to address such risks. Our CIO has primary responsibility for managing our cybersecurity program and efforts. Our internal audit team is responsible for the testing and audit of our information-technology internal controls. We believe our information technology team to be well-qualified in this area. These qualifications include professional experience in the field and recent participation in IT and cybersecurity programs organized by leading institutions with expertise in the field.
Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block]	As part of its oversight function, the Audit Committee of the Board oversees the Company’s risk assessment and risk management policies, including related to cybersecurity and the data protection program, and performs an annual review and assessment of the primary operational and regulatory risks facing the Company, their relative magnitude and management’s plan for mitigating these risks.
Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block]	At least annually, our CIO reports to the Audit Committee with a comprehensive report addressing a broad range of topics, including significant cybersecurity incidents that have occurred since the last update, the status of projects and initiatives to update our cybersecurity policies and practices, and ongoing efforts to prevent, detect, and respond to internal and external critical threats.
Cybersecurity Risk Role of Management [Text Block]	At least annually, our CIO reports to the Audit Committee with a comprehensive report addressing a broad range of topics, including significant cybersecurity incidents that have occurred since the last update, the status of projects and initiatives to update our cybersecurity policies and practices, and ongoing efforts to prevent, detect, and respond to internal and external critical threats.Our senior management is responsible for assessing and managing the Company’s various exposures to risk, including those related to cybersecurity, on a day-to-day basis, including the identification of risks through a robust enterprise risk management framework and the creation of appropriate risk management programs and policies to address such risks. Our CIO has primary responsibility for managing our cybersecurity program and efforts. Our internal audit team is responsible for the testing and audit of our information-technology internal controls.
Cybersecurity Risk Management Positions or Committees Responsible [Flag]	true
Cybersecurity Risk Management Positions or Committees Responsible [Text Block]	Our Board actively oversees our risk management activities both directly and through its committees and considers various risk topics throughout the year, including cybersecurity and information security risk management and controls. As part of its oversight function, the Audit Committee of the Board oversees the Company’s risk assessment and risk management policies, including related to cybersecurity and the data protection program, and performs an annual review and assessment of the primary operational and regulatory risks facing the Company, their relative magnitude and management’s plan for mitigating these risks. At least annually, our CIO reports to the Audit Committee with a comprehensive report addressing a broad range of topics, including significant cybersecurity incidents that have occurred since the last update, the status of projects and initiatives to update our cybersecurity policies and practices, and ongoing efforts to prevent, detect, and respond to internal and external critical threats.
Cybersecurity Risk Management Expertise of Management Responsible [Text Block]	we maintain a dedicated cybersecurity team under the direction of our Chief Information Officer (CIO), who has expertise related to data and network security, data governance and risk management;
Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block]	At least annually, our CIO reports to the Audit Committee with a comprehensive report addressing a broad range of topics, including significant cybersecurity incidents that have occurred since the last update, the status of projects and initiatives to update our cybersecurity policies and practices, and ongoing efforts to prevent, detect, and respond to internal and external critical threats.Our senior management is responsible for assessing and managing the Company’s various exposures to risk, including those related to cybersecurity, on a day-to-day basis, including the identification of risks through a robust enterprise risk management framework and the creation of appropriate risk management programs and policies to address such risks. Our CIO has primary responsibility for managing our cybersecurity program and efforts. Our internal audit team is responsible for the testing and audit of our information-technology internal controls.
Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag]	true

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 28, 2024
Accounting Policies [Abstract]
Fiscal Years	Fiscal Years The Company’s fiscal year ends on the last Saturday of December and consisted of 52 weeks in 2024 and 2023, and 53 weeks in 2022. These dates were December 28, 2024, December 30, 2023, and December 31, 2022.
Basis of Presentation	Basis of Presentation The Consolidated Financial Statements include the accounts of Mueller Industries, Inc. and its majority-owned subsidiaries. The noncontrolling interests represent a private ownership interest of 40 percent of Jungwoo Metal Ind. Co., LTD (Jungwoo-Mueller) and 45 percent of Mueller Middle East WLL (Mueller Middle East).
Reclassifications	Certain prior year balances have been reclassified to conform to current year presentation.
Revenue Recognition	Revenue Recognition Given the nature of the Company’s business and product offerings, sales transactions with customers are generally comprised of a single performance obligation that involves delivery of the products identified in the contracts with customers. Performance obligations are generally satisfied at the point in time of shipment and payment is generally due within 60 days. Variable consideration is estimated for future rebates on certain product lines and product returns. The Company records variable consideration as an adjustment to the transaction price in the period it is incurred. Since variable consideration is settled within a short period of time, the time value of money is not significant. The cost of shipping product to customers is expensed as incurred as a component of cost of goods sold.
Acquisitions	Acquisitions Accounting for acquisitions requires the Company to recognize separately from goodwill the assets acquired and liabilities assumed at their acquisition date fair values. Goodwill is measured as the excess of the purchase price over the net amount allocated to the identifiable assets acquired and liabilities assumed. While management uses its best estimates and assumptions to accurately value assets acquired and liabilities assumed at the acquisition date, the estimates are inherently uncertain and
Cash Equivalents and Restricted Cash	Cash Equivalents and Restricted Cash Temporary investments with original maturities of three months or less are considered to be cash equivalents. These investments are stated at cost. At December 28, 2024 and December 30, 2023, temporary investments consisted of money market mutual funds, commercial paper, bank repurchase agreements, and U.S. and foreign government securities totaling approximately $776.6 million and $1.01 billion, respectively.
Short-Term Investments and Investments in Unconsolidated Affiliate	Short-Term Investments The fair value of short-term investments at December 28, 2024 and December 30, 2023, consisting of marketable securities, approximates the carrying value on that date. These marketable securities are stated at fair value and classified as level 1 within the fair value hierarchy. This classification is defined as a fair value determined using observable inputs that reflect quoted prices in active markets for identical assets. During 2024, the Company recognized gains of $0.9 million on short-term investments, of which $0.4 million was realized on the sale of marketable securities and the remaining $0.5 million represents unrealized gains relating to the excess fair value over the related cost basis of the marketable securities as of December 28, 2024. During 2023, the Company recognized gains of $41.9 million on short-term investments, of which $17.1 million was realized on the sale of marketable securities and the remaining $24.8 million represented unrealized gains relating to the excess fair value over the related cost basis of the marketable securities as of December 30, 2023. Investments in Unconsolidated Affiliates Tecumseh The Company owns a 50 percent interest in an unconsolidated affiliate that acquired Tecumseh Products Company (Tecumseh) and an entity that provides financing to Tecumseh. This investment is recorded using the equity method of accounting, as the Company can exercise significant influence but does not own a majority equity interest or otherwise control the entity. Under the equity method of accounting, this investment is stated at initial cost and is adjusted for subsequent additional investments and the Company’s proportionate share of earnings or losses and distributions. The Company records its proportionate share of the investee’s net income or loss, net of foreign taxes, one quarter in arrears as income (loss) from unconsolidated affiliates, net of foreign tax, in the Consolidated Statements of Income. The Company’s proportionate share of the investee’s other comprehensive income (loss), net of income taxes, is recorded in the Consolidated Statements of Comprehensive Income and Consolidated Statements of Changes in Equity. The U.S. tax effect of the Company’s proportionate share of Tecumseh’s income or loss is recorded in income tax expense in the Consolidated Statements of Income. Retail Distribution The Company owns a 28 percent noncontrolling equity interest in a limited liability company in the retail distribution business. This investment is recorded using the equity method of accounting. The Company records its proportionate share of the investee’s net income or loss one month in arrears as income (loss) from unconsolidated affiliates in the Consolidated Statements of Income. The Company’s proportionate share of the investee’s other comprehensive income (loss), net of income taxes, is recorded in the Consolidated Statements of Comprehensive Income and Consolidated Statements of Changes in Equity.
Allowance for Doubtful Accounts	Allowance for Doubtful Accounts
Inventories	Inventories The Company’s inventories are valued at the lower-of-cost-or-market. The material component of its U.S. copper tube and copper fittings inventories is valued on a LIFO basis and the non-material components of U.S. copper tube and copper fittings inventories are valued on a FIFO basis. The material component of its U.K. and Canadian copper tube inventories are valued on a FIFO basis. The material component of its brass rod, forgings, wire, and cable inventories are valued on a FIFO basis. Certain inventories are valued on an average cost basis. Elements of cost in finished goods inventory in addition to the cost of material include depreciation, amortization, utilities, maintenance, production wages, and transportation costs. The market price of copper cathode and scrap is subject to volatility. During periods when open market prices decline below net book value, the Company may need to provide an allowance to reduce the carrying value of its inventory. In addition, certain items in inventory may be considered obsolete and, as such, the Company may establish an allowance to reduce the carrying value of those items to their net realizable value. Changes in these estimates related to the value of inventory, if any, may result in a materially adverse impact on the Company’s reported financial position or results of operations. The Company
Leases	Leases one
Property, Plant, and Equipment	Property, Plant, and Equipment Property, plant, and equipment is stated at cost less accumulated depreciation. Expenditures for major additions and improvements are capitalized, while minor replacements, maintenance, and repairs are charged to expense as incurred. Depreciation of buildings, machinery, and equipment is provided on the straight-line method over the estimated useful lives ranging from 20 to 40 years for buildings and five
Goodwill	Goodwill Goodwill is recognized for the excess of the purchase price over the fair value of tangible and identifiable intangible net assets of businesses acquired. Several factors give rise to goodwill in business acquisitions, such as the expected benefit from synergies of the combination and the existing workforce of the acquired business. Goodwill is evaluated annually for possible impairment as of the first day of the fourth quarter unless circumstances indicate the need to accelerate the timing of the evaluation. In the evaluation of goodwill impairment, management performs a qualitative assessment to determine if it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If the qualitative assessment is not conclusive, management compares the fair value of a reporting unit with its carrying amount and will recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value, not to exceed the total amount of goodwill allocated to the reporting unit. Fair value for the Company’s reporting units is determined using a combination of the income and market approaches (level 3 within the fair value hierarchy), incorporating market participant considerations and management’s assumptions on revenue growth rates, operating margins, discount rates and expected capital expenditures. The market approach measures the fair value of a business through the analysis of publicly traded companies or recent sales of similar businesses. The income approach uses a discounted cash flow model to estimate the fair value of reporting units based on expected cash flows (adjusted for capital investment required to support operations) and a terminal value. This cash flow stream is discounted to its present value to arrive at a fair value for each reporting unit. Future earnings are estimated using the Company’s most recent annual projections, applying a growth rate to future periods. Those projections are directly impacted by the condition of the markets in which the Company’s businesses participate. The discount rate selected for the reporting units is generally based on rates of return available for comparable companies at the date of valuation.
Intangible Assets	Intangible Assets three
Self-Insurance Accruals	Self-Insurance Accruals The Company is primarily self-insured for workers’ compensation claims and benefits paid under certain employee health care programs. Accruals are primarily based on estimated undiscounted cost of claims, which includes incurred but not reported claims, and are classified as accrued wages and other employee costs.
Pension Benefit Plans	Pension Benefit Plans The Company sponsors qualified and nonqualified pension benefit plans in certain foreign locations. The Company recognizes the overfunded or underfunded status of the plans as an asset or liability in the Consolidated Balance Sheets with changes in the funded status recorded through comprehensive income in the year in which those changes occur. The obligations for these plans are determined by actuaries and affected by the assumptions, including discount rates, expected long-term return on plan assets for defined benefit pension plans, and certain employee-related factors, such as retirement age and mortality. The Company evaluates its assumptions periodically and makes adjustments as necessary. The expected return on plan assets is determined using the market value of plan assets. Differences between assumed and actual returns are amortized to the market value of assets on a straight-line basis over the average remaining service period of the plan participants using the corridor approach. The corridor approach defers all actuarial gains and losses resulting from variances between actual results and actuarial assumptions. These unrecognized gains and losses are amortized when the net gains and losses exceed 10 percent of the greater of the market value of the plan assets or the projected benefit obligation. The amount in excess of the corridor is amortized over the average remaining service period of the plan participants. For 2024, the average remaining service period for the pension plans was 11 years.
Environmental Reserves and Environmental Expenses	Environmental Reserves and Environmental Expenses The Company recognizes an environmental liability when it is probable the liability exists and the amount is reasonably estimable. The Company estimates the duration and extent of its remediation obligations based upon reports of outside consultants, internal and third-party estimates and analyses of cleanup costs and ongoing monitoring costs, communications with regulatory agencies, and changes in environmental law. If the Company were to determine that its estimates of the duration or extent of its environmental obligations were no longer accurate, it would adjust environmental liabilities accordingly in the period that such determination is made. Estimated future expenditures for environmental remediation are not discounted to their present value. Environmental expenses related to non-operating properties
Earnings Per Share	Earnings Per Share
Income Taxes	Income Taxes Deferred income tax assets and liabilities are recognized when differences arise between the treatment of certain items for financial statement and tax purposes. Realization of certain components of deferred tax assets is dependent upon the occurrence of future events. The Company records valuation allowances to reduce its deferred tax assets to the amount it believes is more likely than not to be realized. These valuation allowances can be impacted by changes in tax laws, changes to statutory tax rates, and future taxable income levels and are based on the Company’s judgment, estimates, and assumptions regarding those future events. In the event the Company was to determine that it would not be able to realize all or a portion of the net deferred tax assets in the future, it would increase the valuation allowance through a charge to income tax expense in the period that such determination is made. Conversely, if it was to determine that it would be able to realize its deferred tax assets in the future, in excess of the net carrying amounts, the Company would decrease the recorded valuation allowance through a decrease to income tax expense in the period that such determination is made. The Company provides for uncertain tax positions and the related interest and penalties, if any, based upon management’s assessment of whether a tax benefit is more likely than not to be sustained upon examination by tax authorities. Tax benefits for uncertain tax positions that are recognized in the financial statements are measured as the largest amount of benefit, determined on a cumulative probability basis, that is more likely than not to be realized upon ultimate settlement. To the extent the Company prevails in matters for which a liability for an uncertain tax position is established or is required to pay amounts in excess of the liability, the Company’s effective tax rate in a given financial statement period may be affected.
Taxes Collected from Customers and Remitted to Governmental Authorities	Taxes Collected from Customers and Remitted to Governmental Authorities Taxes assessed by a governmental authority that are directly imposed on a revenue producing transaction between the Company and its customers, primarily value added taxes in foreign jurisdictions, are accounted for on a net (excluded from revenues and costs) basis.
Stock-Based Compensation	Stock-Based Compensation
Concentrations of Credit and Market Risk	Concentrations of Credit and Market Risk Concentrations of credit risk with respect to accounts receivable are limited due to the large number of customers comprising the Company’s customer base, and their dispersion across different geographic areas and different industries, including HVAC, plumbing, refrigeration, hardware, automotive, OEMs, energy, telecommunication, electrical transmission and distribution, and others. The Company minimizes its exposure to base metal price fluctuations through various strategies. Generally, it prices an equivalent amount of copper raw material, under flexible pricing arrangements it maintains with its suppliers, at the time it determines the selling price of finished products to its customers.
Derivative Instruments and Hedging Activities	Derivative Instruments and Hedging Activities The Company’s earnings and cash flows are subject to fluctuations due to changes in commodity prices, foreign currency exchange rates, and interest rates. The Company uses derivative instruments such as commodity futures contracts, foreign currency forward contracts, and interest rate swaps to manage these exposures. All derivatives are recognized in the Consolidated Balance Sheets at their fair value. On the date the derivative contract is entered into, it is either a) designated as a hedge of (i) a forecasted transaction or the variability of cash flow to be paid (cash flow hedge) or (ii) the fair value of a recognized asset or liability (fair value hedge), or b) not designated in a hedge accounting relationship, even though the derivative contract was executed to mitigate an economic exposure (economic hedge), as the Company does not enter into derivative contracts for trading purposes. Changes in the fair value of a derivative that is qualified, designated, and highly effective as a cash flow hedge are recorded in stockholders’ equity within accumulated other comprehensive income (AOCI), to the extent effective, until they are reclassified to earnings in the same period or periods during which the hedged transaction affects earnings. Changes in the fair value of undesignated derivative instruments executed as economic hedges are reported in current earnings. The Company documents all relationships between derivative instruments and hedged items, as well as the risk-management objective and strategy for undertaking various hedge transactions. This process includes linking all derivative instruments that are designated as fair value hedges to specific assets and liabilities in the Consolidated Balance Sheets and linking cash flow hedges to specific forecasted transactions or variability of cash flow. The Company also assesses, both at the hedge’s inception and on an ongoing basis, whether the designated derivative instruments that are used in hedging transactions are highly effective in offsetting changes in cash flow or fair values of hedged items. When a derivative instrument is determined not to be highly effective as a hedge or the underlying hedged transaction is no longer probable of occurring, hedge accounting is discontinued prospectively in accordance with the derecognition criteria for hedge accounting.
Fair Value of Financial Instruments	Fair Value of Financial Instruments The carrying amounts for cash and cash equivalents, accounts receivable, and accounts payable approximate fair value due to the short-term maturity of these instruments.
Foreign Currency Translation	Foreign Currency Translation
Use of and Changes in Estimates	Use of and Changes in Estimates The preparation of financial statements in conformity with generally accepted accounting principles in the United States (U.S. GAAP) requires management to make estimates, assumptions, and judgments that affect the amounts reported in the financial statements and accompanying notes. Management makes its best estimate of the ultimate outcome for these items based on historical trends and other information available when the financial statements are prepared. Changes in estimates are recognized in accordance with the accounting rules for the estimate, which is typically in the period when new information becomes available to management. Areas where the nature of the estimate makes it reasonably possible that actual results could materially differ from amounts estimated include but are not limited to: pension and other postretirement benefit plan obligations, tax liabilities, loss contingencies, litigation claims, environmental reserves, acquisitions, and impairment assessments of long-lived assets (including goodwill).
Recently Adopted and Issued Accounting Standards	Recently Adopted Accounting Standards In November 2023, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures . The new guidance requires a public entity to disclose significant segment expenses and other segment items on an annual and interim basis and to provide in interim periods all disclosures about a reportable segment’s profit or loss and assets that are currently required annually. The guidance applies to all public entities and is effective for fiscal years beginning after December 15, 2023, and for interim periods beginning after December 15, 2024. The updated guidance requires retrospective adoption, and early adoption was permitted. The Company adopted the ASU during the fourth quarter of 2024 and updated its disclosures accordingly. See “ Note 3 – Segment Information ” for additional information. In June 2022, the FASB issued ASU 2022-03, Fair Value Measurement (Topic 820): Fair Value Measurement of Equity Securities Subject to Contractual Sale Restrictions. The new guidance was issued to clarify existing guidance measuring the fair value of an equity security subject to contractual restrictions that prohibit the sale of an equity security and introduce new disclosure requirements for applicable equity securities. The ASU was effective for fiscal years beginning after December 15, 2023 for public entities. The guidance requires prospective adoption, and early adoption was permitted. The Company adopted the ASU during the first quarter of 2023. The adoption of the ASU did not have a material impact on the Company’s Consolidated Financial Statements. Recently Issued Accounting Standards In November 2024, the FASB issued ASU 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses . The new guidance requires disclosure of additional information about specific expense categories. The guidance applies to all public entities and is effective for fiscal years beginning after December 15, 2026, and for interim periods beginning after December 15, 2027. The updated guidance requires prospective adoption but may be applied retrospectively, and early adoption is permitted. The Company is in the process of analyzing the impact of the standard on its disclosures. In March 2024, the Securities and Exchange Commission issued final rules on the enhancement and standardization of climate-related disclosures. The rules require disclosure of, among other things: material climate-related risks, activities to mitigate or adapt to such risks, governance and management of such risks, and material greenhouse gas (GHG) emissions from operations owned or controlled (Scope 1) and/or indirect emissions from purchased energy consumed in operations (Scope 2). Additionally, the rules require disclosure in the notes to the financial statements of the effects of severe weather events and other natural conditions, subject to certain materiality thresholds. The rules will become effective on a phased-in timeline in fiscal years beginning in 2025. The Company is in the process of analyzing the impact of the rules on its disclosures. In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures . The new guidance primarily enhances and expands both the income tax rate reconciliation disclosure and the income taxes paid disclosure. The ASU is effective for annual periods beginning after December 15, 2024 for public entities on a prospective basis. Early adoption is permitted. The Company is in the process of analyzing the impact of the standard on its disclosures.

Acquisitions and Dispositions (

Acquisitions and Dispositions (Tables)	12 Months Ended
	Dec. 28, 2024
Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]
Schedule of Condensed Pro Forma Consolidated Results of Operations	The following table presents pro forma consolidated results of operations as if the Nehring acquisition had occurred at the beginning of 2023. The pro forma information does not purport to be indicative of the results that would have been obtained if the operations had actually been combined during the periods presented, and is not necessarily indicative of operating results to be expected in future periods. The most significant pro forma adjustments to the historical results of operations relate to the application of purchase accounting and the amortization for intangible assets acquired, the financing structure, and estimated income taxes. (In thousands, except per share data) 2024 2023 Net sales $ 3,903,228 $ 3,811,909 Net income 608,961 624,683 Basic earnings per share $ 5.47 $ 5.61 Diluted earnings per share $ 5.34 $ 5.50
Schedule of Final Valuation of the Long-Lived Assets	The following table summarizes the allocation of the purchase price to acquire these businesses, which were financed by available cash balances, as well as the assets acquired and liabilities assumed at the respective acquisition dates. The purchase price allocations for both acquisitions are provisional as of December 28, 2024 and subject to change during the measurement periods. (In thousands) Elkhart Nehring Total consideration $ 38,158 $ 569,171 Allocated to: Accounts receivable 10,827 41,666 Inventories 18,720 38,803 Other current assets 356 960 Property, plant, and equipment 5,916 98,819 Tax-deductible goodwill 15,107 146,137 Intangible assets — 271,700 Total assets acquired 50,926 598,085 Accounts payable 5,962 19,569 Other current liabilities 6,806 9,345 Total liabilities assumed 12,768 28,914 Net assets acquired $ 38,158 $ 569,171
Schedule of Intangible Assets Identified in the Allocation of the Purchase Price	The following details the total intangible assets identified in the allocation of the purchase price at the respective acquisition dates: (In thousands) Estimated Useful Life Nehring Intangible asset type: Customer relationships 20 years $ 208,080 Non-compete agreements 5 years 700 Trade names 15 years 54,530 Certifications 5 years 8,390 Total intangible assets $ 271,700

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
	Dec. 28, 2024
Segment Reporting [Abstract]
Schedule of Disaggregation of Revenue from Contracts with Customers	The following tables represent a disaggregation of revenue from contracts with customers, along with the reportable segment for each category: For the Year Ended December 28, 2024 (In thousands) Piping Systems Industrial Metals Climate Total Tube and fittings $ 2,063,777 $ — $ — $ 2,063,777 Brass rod, forgings, wire and cable — 695,883 — 695,883 OEM components and valves — 73,197 118,626 191,823 Valves and plumbing specialties 450,319 — — 450,319 Flex duct and other HVAC components — — 369,820 369,820 Other — 49,359 — 49,359 $ 2,514,096 $ 818,439 $ 488,446 $ 3,820,981 Intersegment sales (52,215) Net sales $ 3,768,766 Disaggregation of revenue from contracts with customers (continued): For the Year Ended December 30, 2023 (In thousands) Piping Systems Industrial Metals Climate Total Tube and fittings $ 1,926,975 $ — $ — $ 1,926,975 Brass rod and forgings — 454,246 — 454,246 OEM components, tube & assemblies — 79,879 120,923 200,802 Valves and plumbing specialties 455,598 — — 455,598 Flex duct and other HVAC components — — 379,867 379,867 Other — 43,750 — 43,750 $ 2,382,573 $ 577,875 $ 500,790 $ 3,461,238 Intersegment sales (40,893) Net sales $ 3,420,345 For the Year Ended December 31, 2022 (In thousands) Piping Systems Industrial Metals Climate Total Tube and fittings $ 2,211,963 $ — $ — $ 2,211,963 Brass rod and forgings — 510,865 — 510,865 OEM components, tube & assemblies — 74,647 121,004 195,651 Valves and plumbing specialties 518,121 — — 518,121 Flex duct and other HVAC components — — 529,303 529,303 Other — 59,177 — 59,177 $ 2,730,084 $ 644,689 $ 650,307 $ 4,025,080 Intersegment sales (42,625) Net sales $ 3,982,455
Schedule of Segment Information	Summarized segment information is as follows: For the Year Ended December 28, 2024 (In thousands) Piping Systems Industrial Metals Climate Total External net sales $ 2,477,729 $ 803,277 $ 487,760 $ 3,768,766 Internal net sales 36,367 15,162 686 52,215 2,514,096 818,439 488,446 3,820,981 Reconciliation of net sales: Elimination of intersegment net sales (52,215) Total net sales 3,768,766 Less: (1) Manufacturing costs (2) 1,797,203 697,400 317,263 2,811,866 Sales and marketing expense 27,605 3,822 13,707 45,134 Distribution expense 39,108 2,237 2,137 43,482 Other segment items (3) 32,729 22,420 9,285 64,434 Segment operating income 617,451 92,560 146,054 856,065 Reconciliation of segment operating income: Corporate expenses (85,676) Interest expense (410) Interest income 53,468 Realized and unrealized gains on short-term investments 914 Environmental expense (2,218) Gain on extinguishment of NMTC liability 1,265 Other expense, net (2,946) Income before income taxes $ 820,462 (1) The significant expense categories and amounts align with the segment-level information that is regularly provided to the CODM. Intersegment expenses are included within the amounts shown. (2) Manufacturing costs include material, manufacturing conversion costs, and freight. (3) Other segment items include administrative employee compensation expense, professional fees, foreign currency exchange gains/losses, other overhead costs, and other items such as gains/losses on sale of assets, impairment charges, and gains on insurance settlements (as applicable). Segment information (continued): For the Year Ended December 30, 2023 (In thousands) Piping Systems Industrial Metals Climate Total External net sales $ 2,355,516 $ 564,115 $ 500,714 $ 3,420,345 Internal net sales 27,057 13,760 76 40,893 2,382,573 577,875 500,790 3,461,238 Reconciliation of net sales: Elimination of intersegment net sales (40,893) Total net sales 3,420,345 Less: (1) Manufacturing costs (2) 1,703,161 487,245 318,588 2,508,994 Sales and marketing expense 26,549 2,412 13,981 42,942 Distribution expense 36,645 2,331 2,410 41,386 Other segment items (3) 46,979 9,508 (6,053) 50,434 Segment operating income 569,239 76,379 171,864 817,482 Reconciliation of segment operating income: Corporate expenses (61,429) Interest expense (1,221) Interest income 38,208 Realized and unrealized gains on short-term investments 41,865 Environmental expense (825) Gain on extinguishment of NMTC liability 7,534 Other income, net 3,618 Income before income taxes $ 845,232 Segment information (continued): For the Year Ended December 31, 2022 (In thousands) Piping Systems Industrial Metals Climate Total External net sales $ 2,706,065 $ 627,270 $ 649,120 $ 3,982,455 Internal net sales 24,019 17,419 1,187 42,625 2,730,084 644,689 650,307 4,025,080 Reconciliation of net sales: Elimination of intersegment net sales (42,625) Total net sales 3,982,455 Less: (1) Manufacturing costs (2) 1,960,977 550,040 425,236 2,936,253 Sales and marketing expense 24,292 2,358 19,131 45,781 Distribution expense 35,772 2,368 2,687 40,827 Other segment items (3) 37,981 7,459 15,186 60,626 Segment operating income 671,062 82,464 188,067 941,593 Reconciliation of segment operating income: Corporate expenses (64,444) Interest expense (810) Interest income 6,457 Realized and unrealized gains on short-term investments 2,918 Environmental expense (1,298) Pension plan termination expense (13,100) Other income, net 4,715 Income before income taxes $ 876,031 Other segment disclosures: For the Year Ended December 28, 2024 (In thousands) Piping Systems Industrial Metals Climate Corporate and Unallocated Total Depreciation and amortization (4) $ 20,048 $ 21,511 $ 6,535 $ 5,039 $ 53,133 Loss (gain) on sale of assets, net 257 — (4,471) (1,566) (5,780) Expenditures for long-lived assets (including those resulting from business acquisitions) 26,433 138,211 8,533 11,762 184,939 Segment assets 1,167,955 812,751 264,738 1,045,462 3,290,906 (4) The amount of depreciation and amortization disclosed by reportable segment is included within the other segment expense captions, such as manufacturing costs or other segment items. Other segment disclosures (continued): For the Year Ended December 30, 2023 (In thousands) Piping Systems Industrial Metals Climate Corporate and Unallocated Total Depreciation and amortization (4) $ 20,461 $ 7,273 $ 7,567 $ 4,653 $ 39,954 Gain on sale of businesses — — — (4,137) (4,137) Impairment charges 6,258 — — — 6,258 Gain on insurance settlement — — (19,466) — (19,466) Expenditures for long-lived assets (including those resulting from business acquisitions) 19,118 9,406 15,407 10,094 54,025 Segment assets 1,029,821 157,761 252,561 1,319,158 2,759,301 For the Year Ended December 31, 2022 (In thousands) Piping Systems Industrial Metals Climate Corporate and Unallocated Total Depreciation and amortization (4) $ 22,193 $ 7,647 $ 9,174 $ 4,717 $ 43,731 Gain on sale of assets, net — — — (6,373) (6,373) Expenditures for long-lived assets (including those resulting from business acquisitions) 20,694 6,905 2,611 7,429 37,639 Segment assets 1,088,940 160,702 279,940 712,817 2,242,399
Schedule of Geographic Information	Summarized geographic information is as follows: (In thousands) 2024 2023 2022 Net sales: United States $ 2,826,574 $ 2,572,141 $ 2,965,053 United Kingdom 280,726 270,128 297,582 Canada 344,614 339,682 410,679 Asia and the Middle East 231,092 153,816 217,750 Mexico 85,760 84,578 91,391 Total net sales $ 3,768,766 $ 3,420,345 $ 3,982,455 Long-lived assets: 2024 2023 2022 United States $ 412,294 $ 273,604 $ 266,571 United Kingdom 37,876 40,045 36,474 Canada 15,597 18,152 23,354 Asia and the Middle East 48,115 50,725 51,193 Mexico 1,249 2,639 2,358 Total long-lived assets $ 515,131 $ 385,165 $ 379,950

Cash, Cash Equivalents, and R_2

Cash, Cash Equivalents, and Restricted Cash (Tables)	12 Months Ended
	Dec. 28, 2024
Cash and Cash Equivalents [Abstract]
Schedule of Cash, Cash Equivalents and Restricted Cash	(In thousands) 2024 2023 Cash & cash equivalents $ 1,037,229 $ 1,170,893 Restricted cash included within other current assets 1,564 3,228 Restricted cash included within other assets 102 102 Total cash, cash equivalents, and restricted cash $ 1,038,895 $ 1,174,223
Schedule of Cash, Cash Equivalents and Restricted Cash	(In thousands) 2024 2023 Cash & cash equivalents $ 1,037,229 $ 1,170,893 Restricted cash included within other current assets 1,564 3,228 Restricted cash included within other assets 102 102 Total cash, cash equivalents, and restricted cash $ 1,038,895 $ 1,174,223

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 28, 2024
Inventory Disclosure [Abstract]
Schedule of Inventories	(In thousands) 2024 2023 Raw materials and supplies $ 147,964 $ 111,843 Work-in-process 74,684 61,793 Finished goods 251,447 220,629 Valuation reserves (11,816) (14,017) Inventories $ 462,279 $ 380,248

Consolidated Financial Statem_2

Consolidated Financial Statement Details (Tables)	12 Months Ended
	Dec. 28, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Other Income, Net	Other Income, Net (In thousands) 2024 2023 2022 Net periodic benefit (cost) income $ (299) $ 765 $ 3,168 Accounts payable discounts 1,260 1,502 1,609 Other (3,907) 1,351 (62) Other (expense) income, net $ (2,946) $ 3,618 $ 4,715

Derivative Instruments and He_2

Derivative Instruments and Hedging Activities (Tables)	12 Months Ended
	Dec. 28, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments Designated as Cash Flow Hedges Reflected in the Financial Statements	The following table summarizes the location and fair value of the derivative instruments and disaggregates the net derivative assets and liabilities into gross components on a contract-by-contract basis: Asset Derivatives Liability Derivatives Fair Value Fair Value (In thousands) Balance Sheet Location 2024 2023 Balance Sheet Location 2024 2023 Commodity contracts - gains Other current assets $ 235 $ 589 Other current liabilities $ 42 $ 16 Commodity contracts - losses Other current assets (62) (281) Other current liabilities (405) (383) Total derivatives (1) $ 173 $ 308 $ (363) $ (367) (1) Does not include the impact of cash collateral provided to counterparties .
Schedule of Fair Value Hedges	The following table summarizes the effects of derivative instruments on the Consolidated Statements of Income: (In thousands) Location 2024 2023 Undesignated derivatives: Loss on commodity contracts (nonqualifying) Cost of goods sold $ (2,305) $ (1,071)
Schedule of Activities Related to Derivative Instruments Classified as Cash Flow Hedges	The following tables summarize amounts recognized in and reclassified from AOCI during the period: For the Year Ended December 28, 2024 (In thousands) Gain Recognized in AOCI (Effective Portion), Net of Tax Classification Gains (Losses) Gain Reclassified from AOCI (Effective Portion), Net of Tax Cash flow hedges: Commodity contracts $ 168 Cost of goods sold $ (586) Other 14 Other — Total $ 182 Total $ (586) For the Year Ended December 30, 2023 (In thousands) Gain (Loss) Recognized in AOCI (Effective Portion), Net of Tax Classification Gains (Losses) Gain Reclassified from AOCI (Effective Portion), Net of Tax Cash flow hedges: Commodity contracts $ 1,180 Cost of goods sold $ (2,419) Other (34) Other — Total $ 1,146 Total $ (2,419)

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 28, 2024
Leases [Abstract]
Schedule of Supplemental Information Regarding Operating Leases	The following table includes supplemental information with regards to the Company’s operating leases: (In thousands, except lease term and discount rate) 2024 2023 Operating lease right-of-use assets $ 32,702 $ 35,170 Current portion of operating lease liabilities 8,117 7,893 Noncurrent operating lease liabilities 24,547 26,683 Total operating lease liabilities $ 32,664 $ 34,576 Weighted average discount rate 3.87 % 3.55 % Weighted average remaining lease term (in years) 4.72 5.24
Schedule of Operating Lease Cost and Payments	The following table presents certain information related to operating lease costs and cash paid during the period: For the Year Ended (In thousands) December 28, 2024 December 30, 2023 Operating lease costs $ 10,036 $ 9,705 Short term lease costs 3,512 3,843 Total lease costs $ 13,548 $ 13,548 Cash paid for amounts included in the measurement of lease liabilities $ 9,609 $ 9,276
Schedule of Maturities of Operating Leases	Maturities of the Company’s operating leases are as follows: (In thousands) Amount 2025 $ 9,137 2026 8,406 2027 7,063 2028 4,234 2029 3,053 2030 and thereafter 3,566 Total lease payments 35,459 Less imputed interest (2,795) Total lease obligations 32,664 Less current obligations (8,117) Noncurrent lease obligations $ 24,547

Property, Plant, and Equipmen_2

Property, Plant, and Equipment, Net (Tables)	12 Months Ended
	Dec. 28, 2024
Property, Plant and Equipment [Abstract]
Schedule of Property, Plant, and Equipment, Net	(In thousands) 2024 2023 Land and land improvements $ 36,853 $ 33,127 Buildings 258,355 232,169 Machinery and equipment 759,202 654,079 Construction in progress 79,216 82,552 1,133,626 1,001,927 Less accumulated depreciation (618,495) (616,762) Property, plant, and equipment, net $ 515,131 $ 385,165

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Dec. 28, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Changes in the Carrying Amount of Goodwill	The changes in the carrying amount of goodwill by segment were as follows: (In thousands) Piping Systems Industrial Metals Climate Total Goodwill $ 178,574 $ 8,854 $ 21,652 $ 209,080 Accumulated impairment charges (40,552) (8,853) (2,087) (51,492) Balance at December 31, 2022: 138,022 1 19,565 157,588 Reductions (1) (7,007) — — (7,007) Currency translation 1,239 — — 1,239 Balance at December 30, 2023: 132,254 1 19,565 151,820 Additions (2) 15,107 146,137 — 161,244 Currency translation (1,899) — — (1,899) Balance at December 28, 2024: Goodwill 186,014 154,991 21,652 362,657 Accumulated impairment charges (40,552) (8,853) (2,087) (51,492) Goodwill, net $ 145,462 $ 146,138 $ 19,565 $ 311,165 (1) Includes disposal of Heatlink Group business. (2) Includes acquisitions of Nehring and Elkhart businesses.
Schedule of Carrying Amount of Intangible Assets	The carrying amount of intangible assets at December 28, 2024 was as follows: (In thousands) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Customer relationships $ 259,831 $ (25,403) $ 234,428 Non-compete agreements 2,847 (2,229) 618 Patents and technology 16,385 (8,915) 7,470 Trade names and licenses 74,816 (10,975) 63,841 Other 1,715 (1,715) — Other intangible assets $ 355,594 $ (49,237) $ 306,357 The carrying amount of intangible assets at December 30, 2023 was as follows: (In thousands) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Customer relationships $ 50,009 $ (17,535) $ 32,474 Non-compete agreements 2,325 (2,325) — Patents and technology 16,681 (8,119) 8,562 Trade names and licenses 12,092 (6,920) 5,172 Other 1,715 (1,715) — Other intangible assets $ 82,822 $ (36,614) $ 46,208
Schedule of Amortization Expense for Intangible Assets	Future amortization expense is estimated as follows: (In thousands) Amount 2025 $ 20,419 2026 20,281 2027 20,280 2028 20,042 2029 18,743 Thereafter 206,592 Expected amortization expense $ 306,357

Benefit Plans (Tables)

Benefit Plans (Tables)	12 Months Ended
	Dec. 28, 2024
Retirement Benefits [Abstract]
Schedule of Reconciliation of the Changes in the Plans' Benefit Obligations and the Fair Value of the Plans Assets	The following tables provide a reconciliation of the changes in the most significant plans’ benefit obligations and the fair value of the plans’ assets for 2024 and 2023, and a statement of the plans’ aggregate funded status: Pension Benefits Other Benefits (In thousands) 2024 2023 2024 2023 Change in benefit obligation: Obligation at beginning of year $ 54,435 $ 50,761 $ 9,557 $ 9,240 Service cost — — 202 183 Interest cost 2,337 2,454 497 439 Actuarial (gain) loss (5,245) 1,508 (604) (105) Plan amendments/transference — — — 101 Benefit payments (3,263) (3,582) (664) (686) Foreign currency translation adjustment (487) 3,294 (671) 385 Obligation at end of year 47,777 54,435 8,317 9,557 Change in fair value of plan assets: Fair value of plan assets at beginning of year 62,871 62,298 — — Actual return on plan assets (7,788) 410 — — Employer contributions — — 664 686 Benefit payments (3,263) (3,582) (664) (686) Foreign currency translation adjustment (780) 3,745 — — Fair value of plan assets at end of year 51,040 62,871 — — Funded (underfunded) status at end of year $ 3,263 $ 8,436 $ (8,317) $ (9,557)
Schedule of Amounts Recognized in Accumulated OCI (Before the Effect of Income Taxes)	The following represents amounts recognized in AOCI (before the effect of income taxes): Pension Benefits Other Benefits (In thousands) 2024 2023 2024 2023 Unrecognized net actuarial loss (gain) $ 12,617 $ 7,728 $ (3,863) $ (3,863) Unrecognized prior service credit — — (6) (5)
Schedule of Funded Status of the Plans Recognized	As of December 28, 2024 and December 30, 2023, the total funded status of the plans recognized in the Consolidated Balance Sheets was as follows: Pension Benefits Other Benefits (In thousands) 2024 2023 2024 2023 Long-term asset $ 3,263 $ 8,436 $ — $ — Current liability $ — $ — $ (926) $ (1,041) Long-term liability — — (7,391) (8,516) Total funded (underfunded) status $ 3,263 $ 8,436 $ (8,317) $ (9,557)
Schedule of Components of Net Periodic Benefit Costs	The components of net periodic benefit cost (income) are as follows: (In thousands) 2024 2023 2022 Pension benefits: Interest cost $ 2,337 $ 2,454 $ 1,272 Expected return on plan assets (2,357) (3,260) (3,568) Amortization of net loss 132 — 897 Net periodic benefit cost (income) $ 112 $ (806) $ (1,399) Other benefits: Service cost $ 202 $ 183 $ 291 Interest cost 497 439 346 Amortization of prior service credit (1) (2) (198) Amortization of net gain (391) (449) (220) Curtailment gain — — (1,756) Net periodic benefit cost (income) $ 307 $ 171 $ (1,537)
Schedule of Weighted Average Assumptions Used in the Measurement of the Company's Benefit Obligation and Net Periodic Benefit Cost are as Follows	The weighted average assumptions used in the measurement of the Company’s benefit obligations are as follows: Pension Benefits Other Benefits 2024 2023 2024 2023 Discount rate 5.30 % 4.40 % 6.51 % 5.96 % Expected long-term return on plan assets 5.30 % 4.30 % N/A N/A Rate of compensation increases N/A N/A 5.00 % 5.00 % Rate of inflation 3.30 % 3.20 % N/A N/A The weighted average assumptions used in the measurement of the Company’s net periodic benefit cost are as follows: Pension Benefits Other Benefits 2024 2023 2022 2024 2023 2022 Discount rate 4.40 % 4.80 % 1.90 % 5.96 % 6.08 % 3.73 % Expected long-term return on plan assets 4.30 % 5.51 % 4.96 % N/A N/A N/A Rate of compensation increases N/A N/A N/A 5.00 % 5.00 % 5.00 % Rate of inflation 3.20 % 3.30 % 3.70 % N/A N/A N/A
Schedule of Weighted Average Asset Allocation of the Company’s Pension Fund Assets are as Follows	The weighted average asset allocation of the Company’s pension fund assets are as follows: Pension Plan Assets Asset category 2024 2023 Pooled liability investments 5 % 99 % Buy-in contract 94 — Cash and equivalents (includes money market funds) 1 1 Total 100 % 100 %
Schedule of Plan Assets at Fair Value Within the Fair Value Hierarchy, by Level	The following table sets forth by level, within the fair value hierarchy, the assets of the plans at fair value: Fair Value Measurements at December 28, 2024 (In thousands) Level 1 Level 2 Level 3 Total Cash and money market funds $ 682 $ — $ — $ 682 Pooled liability investments — 2,581 — 2,581 Buy-in contract — — 47,777 47,777 Total $ 682 $ 2,581 $ 47,777 $ 51,040 Fair Value Measurements at December 30, 2023 (In thousands) Level 1 Level 2 Level 3 Total Cash and money market funds $ 502 $ — $ — $ 502 Pooled liability investments — 62,369 — 62,369 Total $ 502 $ 62,369 $ — $ 62,871
Schedule of Plan Assets Measured at Fair Value Using Significant Unobservable Inputs	The table below reflects the changes in the assets of the plan measured at fair value on a recurring basis using significant unobservable inputs (level 3 of fair value hierarchy) during the year ended December 28, 2024: (In thousands) Buy-In Contract Balance, December 30, 2023 $ — Purchases 47,777 Balance, December 28, 2024 $ 47,777
Schedule of Future Benefit Plans Payments	The Company expects future benefits to be paid from the plans as follows: (In thousands) Pension Benefits Other Benefits 2025 $ 3,612 $ 926 2026 3,742 951 2027 3,875 772 2028 4,015 833 2029 4,159 760 2030-2034 23,135 3,876 Total $ 42,538 $ 8,118

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 28, 2024
Income Tax Disclosure [Abstract]
Schedule of Components of Income Before Income Taxes	The components of income before income taxes were taxed under the following jurisdictions: (In thousands) 2024 2023 2022 Domestic $ 672,625 $ 722,153 $ 737,538 Foreign 147,837 123,079 138,493 Income before income taxes $ 820,462 $ 845,232 $ 876,031
Schedule of Components of Income Tax Expense	Income tax expense consists of the following: (In thousands) 2024 2023 2022 Current tax expense: Federal $ 136,248 $ 144,111 $ 149,269 Foreign 37,269 39,167 36,719 State and local 32,426 32,694 41,214 Current tax expense 205,943 215,972 227,202 Deferred tax (benefit) expense: Federal 1,617 4,806 (3,312) Foreign 3,285 270 (192) State and local (5,769) (286) (376) Deferred tax (benefit) expense (867) 4,790 (3,880) Income tax expense $ 205,076 $ 220,762 $ 223,322
Schedule of Income Tax Reconciliation	The difference between the reported income tax expense and a tax determined by applying the applicable U.S. federal statutory income tax rate to income before income taxes is reconciled as follows: (In thousands) 2024 2023 2022 Expected income tax expense $ 172,297 $ 177,499 $ 183,967 State and local income tax, net of federal benefit 19,847 25,542 32,184 Effect of foreign statutory rates different from U.S. and other foreign adjustments 9,308 14,519 7,443 Investment in unconsolidated affiliates 2,114 1,226 206 Other, net 1,510 1,976 (478) Income tax expense $ 205,076 $ 220,762 $ 223,322
Schedule of Components of Deferred Tax Assets and Liabilities	The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities are presented below: (In thousands) 2024 2023 Deferred tax assets: Inventories $ 17,296 $ 19,162 Other postretirement benefits and accrued items 16,202 10,174 Other reserves 6,870 6,956 Foreign tax attributes 4,676 4,862 State tax attributes, net of federal benefit 3,932 6,728 Stock-based compensation 5,100 4,502 Lease liability 6,230 7,354 Basis difference in unconsolidated affiliates 11,649 11,509 Total deferred tax assets 71,955 71,247 Less valuation allowance (16,692) (23,078) Deferred tax assets, net of valuation allowance 55,263 48,169 Deferred tax liabilities: Property, plant, and equipment 52,405 42,980 Lease asset 6,670 7,776 Other liabilities 10,198 10,884 Total deferred tax liabilities 69,273 61,640 Net deferred tax liabilities $ (14,010) $ (13,471)

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 28, 2024
Share-Based Payment Arrangement [Abstract]
Schedule of Share-Based Payment Arrangement, Activity	A summary of the activity and related information follows: Stock Options Restricted Stock Awards Performance Stock Awards (Shares in thousands) Shares Weighted Average Exercise Price Shares Weighted Average Grant Date Fair Value Shares Weighted Average Grant Date Fair Value Beginning of period 626 $ 14.78 664 $ 20.51 1,902 $ 27.63 Granted — N/A 71 62.91 370 64.52 Added by Performance Factor — N/A — N/A 283 21.73 Exercised/Released (204) 13.52 (273) 17.51 (806) 19.59 Forfeited — N/A (7) 26.39 (10) 14.61 End of period 422 $ 15.39 455 $ 28.83 1,739 $ 38.33

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	12 Months Ended
	Dec. 28, 2024
Equity [Abstract]
Schedule of Changes in AOCI by Component, Net of taxes and Noncontrolling Interest	The following table provides changes in AOCI by component, net of taxes and noncontrolling interest (amounts in parentheses indicate debits to AOCI): (In thousands) Cumulative Translation Adjustment Unrealized Gain (Loss) on Derivatives Pension/ Attributable to Unconsol. Affiliates Total Balance at December 31, 2022 $ (69,238) $ 1,486 $ 1,222 $ 2,355 $ (64,175) Other comprehensive income (loss) before reclassifications 21,162 1,146 (3,499) 917 19,726 Amounts reclassified from AOCI — (2,419) (353) — (2,772) Balance at December 30, 2023 (48,076) 213 (2,630) 3,272 (47,221) Other comprehensive (loss) income before reclassifications (27,850) 182 (3,449) (1,152) (32,269) Amounts reclassified from AOCI — (586) (203) — (789) Balance at December 28, 2024 $ (75,926) $ (191) $ (6,282) $ 2,120 $ (80,279)
Schedule of Reclassification Adjustments Out of AOCI	Reclassification adjustments out of AOCI were as follows: Amount reclassified from AOCI (In thousands) 2024 2023 2022 Affected Line Item Unrealized losses (gains) on derivatives: Commodity contracts $ (745) $ (3,109) $ 9,891 Cost of goods sold 159 690 (2,225) Income tax expense (benefit) $ (586) $ (2,419) $ 7,666 Net of tax and noncontrolling interests Amortization of net loss (gain) and prior service cost on employee benefit plans $ (260) $ (451) $ (1,277) Other (expense) income, net 57 98 332 Income tax expense $ (203) $ (353) $ (945) Net of tax and noncontrolling interests

Quarterly Financial Informati_2

Quarterly Financial Information (Tables)	12 Months Ended
	Dec. 28, 2024
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Financial Information (Unaudited)	(In thousands, except per share data) First Second Third Fourth 2024 Net sales $ 849,654 $ 997,745 $ 997,831 $ 923,536 Gross profit (2) 240,951 272,755 275,362 255,370 Consolidated net income 141,709 163,447 171,783 140,603 Net income attributable to Mueller Industries, Inc. 138,363 160,165 168,699 137,652 Basic earnings per share 1.24 1.44 1.51 1.23 Diluted earnings per share 1.21 1.41 1.48 1.21 Dividends per share 0.20 0.20 0.20 0.20 2023 Net sales $ 971,192 $ 896,984 $ 819,792 $ 732,377 Gross profit (2) 292,394 257,712 240,734 195,994 Consolidated net income 175,093 179,551 135,709 119,296 Net income attributable to Mueller Industries, Inc. 173,239 177,711 132,709 119,238 Basic earnings per share 1.56 1.60 1.19 1.07 Diluted earnings per share 1.54 1.56 1.17 1.05 Dividends per share 0.15 0.15 0.15 0.15 (1) The sum of quarterly amounts may not equal the annual amounts reported due to rounding. In addition, the earnings per share amounts are computed independently for each quarter, while the full year is based on the weighted average shares outstanding. (2) Gross profit is net sales less cost of goods sold, which excludes depreciation and amortization.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Details) $ in Thousands		12 Months Ended
	Sep. 26, 2023 shares	Dec. 28, 2024 USD ($) renewal_option shares	Dec. 30, 2023 USD ($) shares	Dec. 31, 2022 USD ($)	Sep. 25, 2023 shares
Noncontrolling Interest [Line Items]
Common stock, authorized (in shares) | shares	250,000,000	250,000,000	250,000,000		100,000,000
Stock split ratio, common stock	2	2
Performance obligation payment term		60 days
Temporary investments		$ 776,600	$ 1,010,000
Gain on short term investments		900	41,900
Marketable securities, realized gain		400	17,100
Marketable securities, unrealized gain		500	24,800
Allowance for doubtful accounts		$ 3,724	$ 2,830
Number of operating lease renewal options | renewal_option		1
Operating lease renewal term		5 years
Specified percentage over which unrecognized gains and losses are amortized		10%
Average remaining service period for the pension plans		11 years
Environmental Remediation Expense, Statement of Income or Comprehensive Income [Extensible Enumeration]		Environmental Remediation Expense, Non-Operating Properties
Stock-based awards excluded from the computation of diluted earnings per share (in shares) | shares		0	98,000
Foreign currency transaction gains (losses)		$ 7,300	$ (4,400)	$ 1,000
Tecumseh Products Holdings LLC
Noncontrolling Interest [Line Items]
Equity method investment, ownership percentage		50%
Retail Distribution Business
Noncontrolling Interest [Line Items]
Equity method investment, ownership percentage		28%
Minimum
Noncontrolling Interest [Line Items]
Operating lease, lease term		1 year
Intangible assets, useful life		3 years
Maximum
Noncontrolling Interest [Line Items]
Operating lease, lease term		15 years
Intangible assets, useful life		20 years
Buildings | Minimum
Noncontrolling Interest [Line Items]
Property, plant and equipment, useful life		20 years
Buildings | Maximum
Noncontrolling Interest [Line Items]
Property, plant and equipment, useful life		40 years
Machinery and equipment | Minimum
Noncontrolling Interest [Line Items]
Property, plant and equipment, useful life		5 years
Machinery and equipment | Maximum
Noncontrolling Interest [Line Items]
Property, plant and equipment, useful life		20 years
Jungwoo Metal Ind. Co., LTD
Noncontrolling Interest [Line Items]
Non-controlling ownership interest		40%
Mueller Middle East BSC
Noncontrolling Interest [Line Items]
Non-controlling ownership interest		45%

Acquisitions and Dispositions -

Acquisitions and Dispositions - Narrative (Details) $ in Thousands				5 Months Ended	8 Months Ended	12 Months Ended
	Aug. 02, 2024 USD ($) location	May 28, 2024 USD ($)	Jul. 03, 2023 USD ($)	Dec. 28, 2024 USD ($)	Dec. 28, 2024 USD ($)	Dec. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)	Sep. 02, 2021
Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Exchange | Heatlink Group, Inc.
Business Acquisition [Line Items]
Ownership interest transferred (as a percent)			100%
Net sales of disposed of business						$ 15,600	$ 39,100
Operating income of disposed business						1,700	$ 7,200
Gain (loss) on disposal of businesses						$ 4,100
Consideration for sale of businesses			$ 26,000
Elkhart
Business Acquisition [Line Items]
Consideration transferred net of working capital adjustments	$ 38,200			$ 38,158
Number of manufacturing locations | location	2
Nehring
Business Acquisition [Line Items]
Consideration transferred net of working capital adjustments		$ 569,200			$ 569,171
Cash portion of acquisition price		564,500
Contingent earn out		$ 19,000
Net sales since acquisition					220,700
Operating income since acquisition					12,400
Transaction related expenses					$ 2,700
Retail Distribution Business
Business Acquisition [Line Items]
Ownership interest acquired (as a percent)			11%					28%
Retail Distribution Business | Die-Mold
Business Acquisition [Line Items]
Ownership interest acquired (as a percent)								17%

Acquisitions - Schedule of Cond

Acquisitions - Schedule of Condensed Pro Forma Consolidated Results of Operations (Details) - Nehring - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023
Business Acquisition [Line Items]
Net sales	$ 3,903,228	$ 3,811,909
Net income	$ 608,961	$ 624,683
Basic earnings per share (in dollars per share)	$ 5.47	$ 5.61
Diluted earnings per share (in dollars per share)	$ 5.34	$ 5.50

Acquisitions and Dispositions_2

Acquisitions and Dispositions - Schedule of Recognized Identifiable Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands			5 Months Ended	8 Months Ended
	Aug. 02, 2024	May 28, 2024	Dec. 28, 2024	Dec. 28, 2024	Apr. 19, 2024
Elkhart
Business Acquisition [Line Items]
Total consideration	$ 38,200		$ 38,158
Accounts receivable			10,827	$ 10,827
Inventories			18,720	18,720
Other current assets			356	356
Property, plant, and equipment			5,916	5,916
Tax-deductible goodwill			15,107	15,107
Intangible assets			0	0
Total assets acquired			50,926	50,926
Accounts payable			5,962	5,962
Other current liabilities			6,806	6,806
Total liabilities assumed			12,768	12,768
Net assets acquired			38,158	38,158
Nehring
Business Acquisition [Line Items]
Total consideration		$ 569,200		569,171
Accounts receivable			41,666	41,666
Inventories			38,803	38,803
Other current assets			960	960
Property, plant, and equipment			98,819	98,819
Tax-deductible goodwill			146,137	146,137
Intangible assets			271,700	271,700	$ 271,700
Total assets acquired			598,085	598,085
Accounts payable			19,569	19,569
Other current liabilities			9,345	9,345
Total liabilities assumed			28,914	28,914
Net assets acquired			$ 569,171	$ 569,171

Acquisitions and Dispositions_3

Acquisitions and Dispositions - Schedule of Intangible Assets Identified (Details) - USD ($) $ in Thousands	Dec. 28, 2024	Apr. 19, 2024	Dec. 31, 2022	Dec. 07, 2021
Minimum
Business Acquisition [Line Items]
Intangible assets, useful life	3 years
Maximum
Business Acquisition [Line Items]
Intangible assets, useful life	20 years
Nehring
Business Acquisition [Line Items]
Intangible assets	$ 271,700	$ 271,700
Customer relationships | Nehring
Business Acquisition [Line Items]
Intangible assets, useful life		20 years
Intangible assets		$ 208,080
Non-compete agreements | Nehring
Business Acquisition [Line Items]
Intangible assets, useful life		5 years
Intangible assets		$ 700
Trade names | Nehring
Business Acquisition [Line Items]
Intangible assets, useful life		15 years
Intangible assets		$ 54,530
Certifications
Business Acquisition [Line Items]
Intangible assets, useful life			5 years
Certifications | Nehring
Business Acquisition [Line Items]
Intangible assets				$ 8,390

Segment Information - Narrative

Segment Information - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 28, 2024 USD ($) building	Dec. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Revenue from External Customer [Line Items]
Disposal Group Not Discontinued Operation Gain Loss On Disposal Statement Of Income Extensible List Not Disclosed Flag		Corporate and Eliminations
Number of buildings sold | building	2
Gain on sale of assets	$ 5,780	$ 0	$ 6,373
Gain on insurance settlement	0	19,466	0
Climate
Revenue from External Customer [Line Items]
Gain on sale of assets	4,471		$ 0
Gain on insurance settlement		19,466
Operating Segments | Climate
Revenue from External Customer [Line Items]
Gain on sale of assets	$ 4,500
Gain on insurance settlement		19,500
Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Exchange | Heatlink Group, Inc.
Revenue from External Customer [Line Items]
Gain (loss) on disposal of businesses		$ 4,100

Segment Information - Schedule

Segment Information - Schedule of Disaggregation of Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 28, 2024	Sep. 28, 2024	Jun. 29, 2024	Mar. 30, 2024	Dec. 30, 2023	Sep. 30, 2023	Jul. 01, 2023	Apr. 01, 2023	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Revenue from External Customer [Line Items]
Net sales	$ 923,536	$ 997,831	$ 997,745	$ 849,654	$ 732,377	$ 819,792	$ 896,984	$ 971,192	$ 3,768,766	$ 3,420,345	$ 3,982,455
Piping Systems
Revenue from External Customer [Line Items]
Net sales									2,477,729	2,355,516	2,706,065
Industrial Metals
Revenue from External Customer [Line Items]
Net sales									803,277	564,115	627,270
Climate
Revenue from External Customer [Line Items]
Net sales									487,760	500,714	649,120
Operating Segments
Revenue from External Customer [Line Items]
Net sales									3,820,981	3,461,238	4,025,080
Operating Segments | Piping Systems
Revenue from External Customer [Line Items]
Net sales									2,514,096	2,382,573	2,730,084
Operating Segments | Industrial Metals
Revenue from External Customer [Line Items]
Net sales									818,439	577,875	644,689
Operating Segments | Climate
Revenue from External Customer [Line Items]
Net sales									488,446	500,790	650,307
Operating Segments | Tube and fittings
Revenue from External Customer [Line Items]
Net sales									2,063,777	1,926,975	2,211,963
Operating Segments | Tube and fittings | Piping Systems
Revenue from External Customer [Line Items]
Net sales									2,063,777	1,926,975	2,211,963
Operating Segments | Tube and fittings | Industrial Metals
Revenue from External Customer [Line Items]
Net sales									0	0	0
Operating Segments | Tube and fittings | Climate
Revenue from External Customer [Line Items]
Net sales									0	0	0
Operating Segments | Brass rod, forgings, wire and cable
Revenue from External Customer [Line Items]
Net sales									695,883	454,246	510,865
Operating Segments | Brass rod, forgings, wire and cable | Piping Systems
Revenue from External Customer [Line Items]
Net sales									0	0	0
Operating Segments | Brass rod, forgings, wire and cable | Industrial Metals
Revenue from External Customer [Line Items]
Net sales									695,883	454,246	510,865
Operating Segments | Brass rod, forgings, wire and cable | Climate
Revenue from External Customer [Line Items]
Net sales									0	0	0
Operating Segments | OEM components, tube & assemblies
Revenue from External Customer [Line Items]
Net sales									191,823	200,802	195,651
Operating Segments | OEM components, tube & assemblies | Piping Systems
Revenue from External Customer [Line Items]
Net sales									0	0	0
Operating Segments | OEM components, tube & assemblies | Industrial Metals
Revenue from External Customer [Line Items]
Net sales									73,197	79,879	74,647
Operating Segments | OEM components, tube & assemblies | Climate
Revenue from External Customer [Line Items]
Net sales									118,626	120,923	121,004
Operating Segments | Valves and plumbing specialties
Revenue from External Customer [Line Items]
Net sales									450,319	455,598	518,121
Operating Segments | Valves and plumbing specialties | Piping Systems
Revenue from External Customer [Line Items]
Net sales									450,319	455,598	518,121
Operating Segments | Valves and plumbing specialties | Industrial Metals
Revenue from External Customer [Line Items]
Net sales									0	0	0
Operating Segments | Valves and plumbing specialties | Climate
Revenue from External Customer [Line Items]
Net sales									0	0	0
Operating Segments | Flex duct and other HVAC components
Revenue from External Customer [Line Items]
Net sales									369,820	379,867	529,303
Operating Segments | Flex duct and other HVAC components | Piping Systems
Revenue from External Customer [Line Items]
Net sales									0	0	0
Operating Segments | Flex duct and other HVAC components | Industrial Metals
Revenue from External Customer [Line Items]
Net sales									0	0	0
Operating Segments | Flex duct and other HVAC components | Climate
Revenue from External Customer [Line Items]
Net sales									369,820	379,867	529,303
Operating Segments | Other
Revenue from External Customer [Line Items]
Net sales									49,359	43,750	59,177
Operating Segments | Other | Piping Systems
Revenue from External Customer [Line Items]
Net sales									0	0	0
Operating Segments | Other | Industrial Metals
Revenue from External Customer [Line Items]
Net sales									49,359	43,750	59,177
Operating Segments | Other | Climate
Revenue from External Customer [Line Items]
Net sales									0	0	0
Intersegment sales
Revenue from External Customer [Line Items]
Net sales									(52,215)	(40,893)	(42,625)
Intersegment sales | Piping Systems
Revenue from External Customer [Line Items]
Net sales									(36,367)	(27,057)	(24,019)
Intersegment sales | Industrial Metals
Revenue from External Customer [Line Items]
Net sales									(15,162)	(13,760)	(17,419)
Intersegment sales | Climate
Revenue from External Customer [Line Items]
Net sales									$ (686)	$ (76)	$ (1,187)

Segment Information - Schedul_2

Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 28, 2024	Sep. 28, 2024	Jun. 29, 2024	Mar. 30, 2024	Dec. 30, 2023	Sep. 30, 2023	Jul. 01, 2023	Apr. 01, 2023	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Net sales	$ 923,536	$ 997,831	$ 997,745	$ 849,654	$ 732,377	$ 819,792	$ 896,984	$ 971,192	$ 3,768,766	$ 3,420,345	$ 3,982,455
Corporate expenses									770,389	756,053	877,149
Interest expense									(410)	(1,221)	(810)
Interest income									53,468	38,208	6,457
Realized and unrealized gains on short-term investments									914	41,865	2,918
Environmental expense									(2,218)	(825)	(1,298)
Gain on extinguishment of NMTC liability									1,265	7,534	0
Pension plan termination expense									0	0	(13,100)
Other (expense) income, net									(2,946)	3,618	4,715
Income before income taxes									820,462	845,232	876,031
Piping Systems
Segment Reporting Information [Line Items]
Net sales									2,477,729	2,355,516	2,706,065
Industrial Metals
Segment Reporting Information [Line Items]
Net sales									803,277	564,115	627,270
Climate
Segment Reporting Information [Line Items]
Net sales									487,760	500,714	649,120
Operating Segments
Segment Reporting Information [Line Items]
Net sales									3,820,981	3,461,238	4,025,080
Manufacturing costs									2,811,866	2,508,994	2,936,253
Sales and marketing expense									45,134	42,942	45,781
Distribution expense									43,482	41,386	40,827
Other segment items									64,434	50,434	60,626
Segment operating income									856,065	817,482	941,593
Operating Segments | Piping Systems
Segment Reporting Information [Line Items]
Net sales									2,514,096	2,382,573	2,730,084
Manufacturing costs									1,797,203	1,703,161	1,960,977
Sales and marketing expense									27,605	26,549	24,292
Distribution expense									39,108	36,645	35,772
Other segment items									32,729	46,979	37,981
Segment operating income									617,451	569,239	671,062
Operating Segments | Industrial Metals
Segment Reporting Information [Line Items]
Net sales									818,439	577,875	644,689
Manufacturing costs									697,400	487,245	550,040
Sales and marketing expense									3,822	2,412	2,358
Distribution expense									2,237	2,331	2,368
Other segment items									22,420	9,508	7,459
Segment operating income									92,560	76,379	82,464
Operating Segments | Climate
Segment Reporting Information [Line Items]
Net sales									488,446	500,790	650,307
Manufacturing costs									317,263	318,588	425,236
Sales and marketing expense									13,707	13,981	19,131
Distribution expense									2,137	2,410	2,687
Other segment items									9,285	(6,053)	15,186
Segment operating income									146,054	171,864	188,067
Intersegment sales
Segment Reporting Information [Line Items]
Net sales									(52,215)	(40,893)	(42,625)
Intersegment sales | Piping Systems
Segment Reporting Information [Line Items]
Net sales									(36,367)	(27,057)	(24,019)
Intersegment sales | Industrial Metals
Segment Reporting Information [Line Items]
Net sales									(15,162)	(13,760)	(17,419)
Intersegment sales | Climate
Segment Reporting Information [Line Items]
Net sales									(686)	(76)	(1,187)
Corporate expenses
Segment Reporting Information [Line Items]
Corporate expenses									(85,676)	(61,429)	(64,444)
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment
Segment Reporting Information [Line Items]
Interest expense									(410)	(1,221)	(810)
Interest income									53,468	38,208	6,457
Realized and unrealized gains on short-term investments									914	41,865	2,918
Environmental expense									(2,218)	(825)	1,298
Gain on extinguishment of NMTC liability									1,265	7,534	4,715
Pension plan termination expense											$ (13,100)
Other (expense) income, net									$ (2,946)	$ 3,618

Segment Information - Other seg

Segment Information - Other segment disclosures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Depreciation and amortization	$ 53,133	$ 39,954	$ 43,731
Gain on sale of businesses	0	(4,137)	0
Gain on sale of assets, net	(5,780)	0	(6,373)
Impairment charges	0	6,258	0
Gain on insurance settlement	0	(19,466)	0
Expenditures for long-lived assets (including those resulting from business acquisitions)	184,939	54,025	37,639
Segment assets	3,290,906	2,759,301	2,242,399
Piping Systems
Segment Reporting Information [Line Items]
Depreciation and amortization	20,048	20,461	22,193
Gain on sale of businesses		0
Gain on sale of assets, net	257		0
Impairment charges		6,258
Gain on insurance settlement		0
Expenditures for long-lived assets (including those resulting from business acquisitions)	26,433	19,118	20,694
Segment assets	1,167,955	1,029,821	1,088,940
Industrial Metals
Segment Reporting Information [Line Items]
Depreciation and amortization	21,511	7,273	7,647
Gain on sale of businesses		0
Gain on sale of assets, net	0		0
Impairment charges		0
Gain on insurance settlement		0
Expenditures for long-lived assets (including those resulting from business acquisitions)	138,211	9,406	6,905
Segment assets	812,751	157,761	160,702
Climate
Segment Reporting Information [Line Items]
Depreciation and amortization	6,535	7,567	9,174
Gain on sale of businesses		0
Gain on sale of assets, net	(4,471)		0
Impairment charges		0
Gain on insurance settlement		(19,466)
Expenditures for long-lived assets (including those resulting from business acquisitions)	8,533	15,407	2,611
Segment assets	264,738	252,561	279,940
Corporate and Unallocated
Segment Reporting Information [Line Items]
Depreciation and amortization	5,039	4,653	4,717
Gain on sale of businesses		(4,137)
Gain on sale of assets, net	(1,566)		(6,373)
Impairment charges		0
Gain on insurance settlement		0
Expenditures for long-lived assets (including those resulting from business acquisitions)	11,762	10,094	7,429
Segment assets	$ 1,045,462	$ 1,319,158	$ 712,817

Segment Information - Schedul_3

Segment Information - Schedule of Geographic Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 28, 2024	Sep. 28, 2024	Jun. 29, 2024	Mar. 30, 2024	Dec. 30, 2023	Sep. 30, 2023	Jul. 01, 2023	Apr. 01, 2023	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 923,536	$ 997,831	$ 997,745	$ 849,654	$ 732,377	$ 819,792	$ 896,984	$ 971,192	$ 3,768,766	$ 3,420,345	$ 3,982,455
Long-lived assets:	515,131				385,165				515,131	385,165	379,950
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									2,826,574	2,572,141	2,965,053
Long-lived assets:	412,294				273,604				412,294	273,604	266,571
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									280,726	270,128	297,582
Long-lived assets:	37,876				40,045				37,876	40,045	36,474
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									344,614	339,682	410,679
Long-lived assets:	15,597				18,152				15,597	18,152	23,354
Asia and the Middle East
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									231,092	153,816	217,750
Long-lived assets:	48,115				50,725				48,115	50,725	51,193
Mexico
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									85,760	84,578	91,391
Long-lived assets:	$ 1,249				$ 2,639				$ 1,249	$ 2,639	$ 2,358

Cash, Cash Equivalents, and R_3

Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($) $ in Thousands	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022	Dec. 25, 2021
Cash and Cash Equivalents [Abstract]
Cash & cash equivalents	$ 1,037,229	$ 1,170,893
Restricted cash included within other current assets	1,564	3,228
Restricted cash included within other assets	102	102
Total cash, cash equivalents, and restricted cash	$ 1,038,895	$ 1,174,223	$ 465,296	$ 90,376

Inventories - Schedule of Inven

Inventories - Schedule of Inventories (Details) - USD ($) $ in Thousands	Dec. 28, 2024	Dec. 30, 2023
Inventory Disclosure [Abstract]
Raw materials and supplies	$ 147,964	$ 111,843
Work-in-process	74,684	61,793
Finished goods	251,447	220,629
Valuation reserves	(11,816)	(14,017)
Inventories	$ 462,279	$ 380,248

Inventories - Narrative (Detail

Inventories - Narrative (Details) - USD ($) $ in Millions	Dec. 28, 2024	Dec. 30, 2023
Inventory Disclosure [Abstract]
LIFO inventory amount	$ 12.4	$ 20.2
FIFO cost of inventories	128	122.9
FIFO value of inventory consigned to others	$ 17.1	$ 19.8

Consolidated Financial Statem_3

Consolidated Financial Statement Details (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Other Current Liabilities [Abstract]
Environmental Loss Contingency, Current, Statement of Financial Position [Extensible Enumeration]	Other current liabilities
Accrued discounts and allowances	$ 81,500	$ 78,800
Taxes payable, current	19,600	22,800
Environmental expense, non operating properties	3,200	3,900
Advances to insurance claim	21,600
Other (Expense) Income, Net [Abstract]
Net periodic benefit (cost) income	(299)	765	$ 3,168
Accounts payable discounts	1,260	1,502	1,609
Other		1,351
Other	(3,907)		(62)
Other (expense) income, net	$ (2,946)	$ 3,618	$ 4,715

Derivative Instruments and He_3

Derivative Instruments and Hedging Activities - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023
Derivative [Line Items]
Restricted cash in other current assets as collateral related to open derivative contracts	$ 1.4	$ 3.2
Commodity Contract
Derivative [Line Items]
Deferred net gains (losses), net of tax, included in AOCI	$ (0.3)
Cash Flow Hedging | Commodity Contract | Long
Derivative [Line Items]
Time period for open copper future contract	12 months
Fair value of future contracts with gain (loss) position	$ (0.4)
Cash Flow Hedging | Commodity Contract | Long | Options Held
Derivative [Line Items]
Open future contracts to purchase copper	25.1
Fair Value Hedging | Commodity Contract | Short
Derivative [Line Items]
Fair value of future contracts with gain (loss) position	0.2
Open future contracts to sell copper	$ 4
Time period for open copper future contract sales	7 months

Derivative Instruments and He_4

Derivative Instruments and Hedging Activities - Summary of Location and Fair Value (Details) - Designated as Hedging Instrument - USD ($) $ in Thousands	Dec. 28, 2024	Dec. 30, 2023
Derivatives, Fair Value [Line Items]
Total derivative assets	$ 173	$ 308
Total derivative liabilities	363	367
Other current assets | Commodity contracts
Derivatives, Fair Value [Line Items]
Other current assets: Gain positions	235	589
Other current assets: Loss positions	(62)	(281)
Other current liabilities | Commodity contracts
Derivatives, Fair Value [Line Items]
Other current liability: Gain positions	42	16
Other current liability: Loss positions	$ (405)	$ (383)

Derivative Instruments and He_5

Derivative Instruments and Hedging Activities - Effects of Derivative Instruments on Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023
Commodity Contract | Not Designated as Hedging Instrument | Cost of goods sold
Derivative Instruments, Gain (Loss) [Line Items]
Loss on commodity contracts (nonqualifying)	$ (2,305)	$ (1,071)

Derivative Instruments and He_6

Derivative Instruments and Hedging Activities - Amounts Recognized In and Reclassified From AOCI (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Gain Recognized in AOCI (Effective Portion), Net of Tax	$ (404)	$ (1,273)	$ 683
Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain Recognized in AOCI (Effective Portion), Net of Tax	182	1,146
Gain Reclassified from AOCI (Effective Portion), Net of Tax	(586)	(2,419)
Commodity contracts | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain Recognized in AOCI (Effective Portion), Net of Tax	168	1,180
Commodity contracts | Cost of goods sold | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain Reclassified from AOCI (Effective Portion), Net of Tax	(586)	(2,419)
Other | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain Recognized in AOCI (Effective Portion), Net of Tax	14	(34)
Gain Reclassified from AOCI (Effective Portion), Net of Tax	$ 0	$ 0

Leases - Summary of Supplementa

Leases - Summary of Supplemental Operating Lease Information (Details) - USD ($) $ in Thousands	Dec. 28, 2024	Dec. 30, 2023
Leases [Abstract]
Operating lease right-of-use assets	$ 32,702	$ 35,170
Current portion of operating lease liabilities	8,117	7,893
Noncurrent operating lease liabilities	24,547	26,683
Total lease obligations	$ 32,664	$ 34,576
Weighted average discount rate (as a percent)	3.87%	3.55%
Weighted average remaining lease term (in years)	4 years 8 months 19 days	5 years 2 months 26 days

Leases - Schedule of Operating

Leases - Schedule of Operating Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023
Leases [Abstract]
Operating lease costs	$ 10,036	$ 9,705
Short term lease costs	3,512	3,843
Total lease costs	13,548	13,548
Cash paid for amounts included in the measurement of lease liabilities	$ 9,609	$ 9,276

Leases - Schedule of Maturities

Leases - Schedule of Maturities of Operating Leases (Details) - USD ($) $ in Thousands	Dec. 28, 2024	Dec. 30, 2023
Leases [Abstract]
2025	$ 9,137
2026	8,406
2027	7,063
2028	4,234
2029	3,053
2030 and thereafter	3,566
Total lease payments	35,459
Less imputed interest	(2,795)
Total lease obligations	32,664	$ 34,576
Less current obligations	(8,117)	(7,893)
Noncurrent lease obligations	$ 24,547	$ 26,683

Property, Plant, and Equipmen_3

Property, Plant, and Equipment, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,133,626	$ 1,001,927
Less accumulated depreciation	(618,495)	(616,762)
Property, plant, and equipment, net	515,131	385,165
Depreciation	39,200	34,949	$ 38,157
Land and land improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	36,853	33,127
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	258,355	232,169
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	759,202	654,079
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 79,216	$ 82,552

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets - Schedule of Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 28, 2024	Dec. 28, 2024	Dec. 30, 2023
Goodwill [Roll Forward]
Goodwill			$ 209,080
Accumulated impairment charges, beginning of year			(51,492)
Goodwill, net, beginning balance		$ 151,820	157,588
Additions		161,244
Reductions			(7,007)
Currency translation		(1,899)	1,239
Goodwill	$ 362,657	362,657
Accumulated impairment charges, end of year	(51,492)	(51,492)
Goodwill, net, ending balance	311,165	311,165	151,820
Goodwill, impairment loss	0
Piping Systems
Goodwill [Roll Forward]
Goodwill			178,574
Accumulated impairment charges, beginning of year			(40,552)
Goodwill, net, beginning balance		132,254	138,022
Additions		15,107
Reductions			(7,007)
Currency translation		(1,899)	1,239
Goodwill	186,014	186,014
Accumulated impairment charges, end of year	(40,552)	(40,552)
Goodwill, net, ending balance	145,462	145,462	132,254
Industrial Metals
Goodwill [Roll Forward]
Goodwill			8,854
Accumulated impairment charges, beginning of year			(8,853)
Goodwill, net, beginning balance		1	1
Additions		146,137
Reductions			0
Currency translation		0	0
Goodwill	154,991	154,991
Accumulated impairment charges, end of year	(8,853)	(8,853)
Goodwill, net, ending balance	146,138	146,138	1
Climate
Goodwill [Roll Forward]
Goodwill			21,652
Accumulated impairment charges, beginning of year			(2,087)
Goodwill, net, beginning balance		19,565	19,565
Additions		0
Reductions			0
Currency translation		0	0
Goodwill	21,652	21,652
Accumulated impairment charges, end of year	(2,087)	(2,087)
Goodwill, net, ending balance	$ 19,565	$ 19,565	$ 19,565

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets - Schedule of Other Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Carrying amount of intangible assets [Abstract]
Expected amortization expense	$ 306,357
Amortization	13,900	$ 5,000	$ 5,600
Customer relationships
Carrying amount of intangible assets [Abstract]
Gross Carrying Amount	259,831	50,009
Accumulated Amortization	(25,403)	(17,535)
Expected amortization expense	234,428	32,474
Non-compete agreements
Carrying amount of intangible assets [Abstract]
Gross Carrying Amount	2,847	2,325
Accumulated Amortization	(2,229)	(2,325)
Expected amortization expense	618	0
Patents and technology
Carrying amount of intangible assets [Abstract]
Gross Carrying Amount	16,385	16,681
Accumulated Amortization	(8,915)	(8,119)
Expected amortization expense	7,470	8,562
Trade names and licenses
Carrying amount of intangible assets [Abstract]
Gross Carrying Amount	74,816	12,092
Accumulated Amortization	(10,975)	(6,920)
Expected amortization expense	63,841	5,172
Other
Carrying amount of intangible assets [Abstract]
Gross Carrying Amount	1,715	1,715
Accumulated Amortization	(1,715)	(1,715)
Expected amortization expense	0	0
Other intangible assets
Carrying amount of intangible assets [Abstract]
Gross Carrying Amount	355,594	82,822
Accumulated Amortization	(49,237)	(36,614)
Expected amortization expense	$ 306,357	$ 46,208

Goodwill and Other Intangible_5

Goodwill and Other Intangible Assets - Schedule of Future Amortization Expense (Details) $ in Thousands	Dec. 28, 2024 USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2025	$ 20,419
2026	20,281
2027	20,280
2028	20,042
2029	18,743
Thereafter	206,592
Expected amortization expense	$ 306,357

Investment in Unconsolidated _2

Investment in Unconsolidated Affiliates (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 28, 2024	Sep. 28, 2024	Jun. 29, 2024	Mar. 30, 2024	Dec. 30, 2023	Sep. 30, 2023	Jul. 01, 2023	Apr. 01, 2023	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Net income (loss)	$ 140,603	$ 171,783	$ 163,447	$ 141,709	$ 119,296	$ 135,709	$ 179,551	$ 175,093	$ 617,542	$ 609,649	$ 662,820
Retail Distribution Business
Schedule of Equity Method Investments [Line Items]
Net income (loss)									11,700	7,900	4,900
Tecumseh Products Holdings LLC
Schedule of Equity Method Investments [Line Items]
Net income (loss)									(9,500)	$ (22,700)	$ 5,200
Advance to affiliates									12,500
Tecumseh Products Holdings LLC | Capital Contribution
Schedule of Equity Method Investments [Line Items]
Advance to affiliates									8,700
Tecumseh Products Holdings LLC | Notes Receivable
Schedule of Equity Method Investments [Line Items]
Advance to affiliates									$ 3,800
Tecumseh Products Holdings LLC
Schedule of Equity Method Investments [Line Items]
Interest in the joint venture, ownership percentage	50%								50%
Retail Distribution Business
Schedule of Equity Method Investments [Line Items]
Interest in the joint venture, ownership percentage	28%								28%

Debt - Narrative (Details)

Debt - Narrative (Details)	12 Months Ended
	Dec. 28, 2024 USD ($)	Dec. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 28, 2024 KRW (₩)
Debt Instrument [Line Items]
Interest paid	$ 0	$ 0	$ 0
Revolving Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility maximum borrowing capacity	400,000,000
Credit Agreement
Debt Instrument [Line Items]
Outstanding letters of credit	$ 28,800,000
Credit Agreement | Minimum
Debt Instrument [Line Items]
Credit facility commitment fee	0.15%
Credit Agreement | Maximum
Debt Instrument [Line Items]
Credit facility commitment fee	0.30%
Credit Agreement | Eurocurrency | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	1.125%
Credit Agreement | Eurocurrency | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	1.625%
Credit Agreement | Base Rate | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	0.125%
Credit Agreement | Base Rate | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	0.625%
Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Outstanding borrowings	$ 0	$ 0
Jungwoo-Mueller
Debt Instrument [Line Items]
Line of credit facility maximum borrowing capacity	$ 12,800,000			₩ 18,000,000,000

New Markets Tax Credit Transa_2

New Markets Tax Credit Transactions (Details) - USD ($) $ in Thousands		1 Months Ended		12 Months Ended
	Oct. 18, 2016	Oct. 31, 2024	Dec. 30, 2023	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Variable Interest Entity [Line Items]
Percentage of qualifying investments on tax credits	39%
Percentage of recapture to the tax credits	100%
Compliance period	7 years
Gain on extinguishment of NMTC liability				$ 1,265	$ 7,534	$ 0
Wells Fargo
Variable Interest Entity [Line Items]
Gain on extinguishment of NMTC liability		$ 1,300	$ 7,500

Benefit Plans - Benefit Plan In

Benefit Plans - Benefit Plan Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Change in fair value of plan assets:
Beginning balance	$ 62,871
Ending balance	51,040	$ 62,871
Pension Benefits
Change in benefit obligation:
Obligation at beginning of year	54,435	50,761
Service cost	0	0
Interest cost	2,337	2,454	$ 1,272
Actuarial (gain) loss	(5,245)	1,508
Plan amendments/transference	0	0
Benefit payments	(3,263)	(3,582)
Foreign currency translation adjustment	(487)	3,294
Obligation at end of year	47,777	54,435	50,761
Change in fair value of plan assets:
Beginning balance	62,871	62,298
Actual return on plan assets	(7,788)	410
Employer contributions	0	0
Benefit payments	(3,263)	(3,582)
Foreign currency translation adjustment	(780)	3,745
Ending balance	51,040	62,871	62,298
Funded (underfunded) status at end of year	3,263	8,436
Other Benefits
Change in benefit obligation:
Obligation at beginning of year	9,557	9,240
Service cost	202	183	291
Interest cost	497	439	346
Actuarial (gain) loss	(604)	(105)
Plan amendments/transference	0	101
Benefit payments	(664)	(686)
Foreign currency translation adjustment	(671)	385
Obligation at end of year	8,317	9,557	9,240
Change in fair value of plan assets:
Beginning balance	0	0
Actual return on plan assets	0	0
Employer contributions	664	686
Benefit payments	(664)	(686)
Foreign currency translation adjustment	0	0
Ending balance	0	0	$ 0
Funded (underfunded) status at end of year	$ (8,317)	$ (9,557)

Benefit Plans - Amounts Recogni

Benefit Plans - Amounts Recognized in Accumulated OCI (Before the Effect of Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023
Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Unrecognized net actuarial loss (gain)	$ 12,617	$ 7,728
Unrecognized prior service credit	0	0
Other Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Unrecognized net actuarial loss (gain)	(3,863)	(3,863)
Unrecognized prior service credit	$ (6)	$ (5)

Benefit Plans - Narrative (Deta

Benefit Plans - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Actuarial net loss	$ 0.3
Payable maximum period to be considered current	12 months
Ultimate health care cost trend rate	4.10%
Compensation expense for the Company's matching contribution	$ 5	$ 4.9	$ 4.9
Multiemployer plan contribution	$ 0.2
Minimum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Annual assumed rate of increase in the per capita cost of covered benefits	5.10%
Maximum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Annual assumed rate of increase in the per capita cost of covered benefits	9.70%

Benefit Plans - Total Funded St

Benefit Plans - Total Funded Status of the Plans Recognized in the Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 28, 2024	Dec. 30, 2023
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Long-term asset	$ 3,263	$ 8,436
Current liability	0	0
Long-term liability	0	0
Total funded (underfunded) status	3,263	8,436
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Long-term asset	0	0
Current liability	(926)	(1,041)
Long-term liability	(7,391)	(8,516)
Total funded (underfunded) status	$ (8,317)	$ (9,557)

Benefit Plans - Components of N

Benefit Plans - Components of Net Periodic Benefit Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Components of net periodic benefit cost (income) [Abstract]
Net periodic benefit cost (income)	$ 299	$ (765)	$ (3,168)
Pension Benefits
Components of net periodic benefit cost (income) [Abstract]
Interest cost	2,337	2,454	1,272
Expected return on plan assets	(2,357)	(3,260)	(3,568)
Amortization of net loss (gain)	132	0	897
Service cost	0	0
Net periodic benefit cost (income)	112	(806)	(1,399)
Other Benefits
Components of net periodic benefit cost (income) [Abstract]
Interest cost	497	439	346
Amortization of net loss (gain)	(391)	(449)	(220)
Service cost	202	183	291
Amortization of prior service credit	(1)	(2)	(198)
Curtailment gain	0	0	(1,756)
Net periodic benefit cost (income)	$ 307	$ 171	$ (1,537)

Benefit Plans - Weighted Averag

Benefit Plans - Weighted Average Assumptions Used in the Measurement of the Company's Benefit Obligation and Net Periodic Benefit Cost (Details)	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Pension Benefits
Weighted average assumptions in benefit obligations calculations [Abstract]
Discount rate	5.30%	4.40%
Expected long-term return on plan assets	5.30%	4.30%
Rate of inflation	3.30%	3.20%
Weighted average assumptions in net periodic benefit calculations [Abstract]
Discount rate	4.40%	4.80%	1.90%
Expected long-term return on plan assets	4.30%	5.51%	4.96%
Rate of inflation	3.20%	3.30%	3.70%
Other Benefits
Weighted average assumptions in benefit obligations calculations [Abstract]
Discount rate	6.51%	5.96%
Rate of compensation increases	5%	5%
Weighted average assumptions in net periodic benefit calculations [Abstract]
Discount rate	5.96%	6.08%	3.73%
Rate of compensation increases	5%	5%	5%

Benefit Plans - Pension Assets

Benefit Plans - Pension Assets by Percentage (Details) - Pension Benefits	Dec. 28, 2024	Dec. 30, 2023
Asset category
Total plan assets (as a percent)	100%	100%
Pooled liability investments
Asset category
Total plan assets (as a percent)	5%	99%
Buy-in contract
Asset category
Total plan assets (as a percent)	94%	0%
Cash and equivalents (includes money market funds)
Asset category
Total plan assets (as a percent)	1%	1%

Benefit Plans - Pension Asset_2

Benefit Plans - Pension Assets by Fair Value Level (Details) - USD ($) $ in Thousands	Dec. 28, 2024	Dec. 30, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Long-term asset	$ 51,040	$ 62,871
Level 1
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Long-term asset	682	502
Level 2
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Long-term asset	2,581	62,369
Level 3
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Long-term asset	47,777	0
Cash and money market funds
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Long-term asset	682	502
Cash and money market funds | Level 1
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Long-term asset	682	502
Cash and money market funds | Level 2
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Long-term asset	0	0
Cash and money market funds | Level 3
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Long-term asset	0	0
Buy-in contract
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Long-term asset	47,777
Buy-in contract | Level 1
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Long-term asset	0
Buy-in contract | Level 2
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Long-term asset	0
Buy-in contract | Level 3
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Long-term asset	47,777
Pooled liability investments
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Long-term asset	2,581	62,369
Pooled liability investments | Level 1
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Long-term asset	0	0
Pooled liability investments | Level 2
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Long-term asset	2,581	62,369
Pooled liability investments | Level 3
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Long-term asset	$ 0	$ 0

Benefit Plans - Assets of the P

Benefit Plans - Assets of the Plan Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Details) $ in Thousands	12 Months Ended
	Dec. 28, 2024 USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	$ 62,871
Ending balance	51,040
Pension Benefits
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	62,871
Ending balance	51,040
Fair Value, Inputs, Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	0
Ending balance	47,777
Fair Value, Inputs, Level 3 | Pension Benefits | Limited Partner
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	0
Purchases	47,777
Ending balance	$ 47,777

Benefit Plans - Contributions a

Benefit Plans - Contributions and Benefit Payments (Details) $ in Thousands	Dec. 28, 2024 USD ($)
Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2025	$ 3,612
2026	3,742
2027	3,875
2028	4,015
2029	4,159
2030-2034	23,135
Total	42,538
Other Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Company's expected contribution to benefit plans in next fiscal year	900
2025	926
2026	951
2027	772
2028	833
2029	760
2030-2034	3,876
Total	$ 8,118

Commitments and Contingencies (

Commitments and Contingencies (Details) $ / shares in Units, $ in Thousands

1 Months Ended

3 Months Ended

12 Months Ended

36 Months Ended

Jul. 24, 2024 USD ($)

Aug. 31, 2023

Mar. 31, 2022 potentially_responsible_party

Feb. 28, 2022 USD ($) smelter_site ft

Jan. 31, 2018 USD ($) unilateralAdministrativeOrder potentially_responsible_party

Nov. 27, 2015 USD ($)

Aug. 31, 2015 mining_site

Jun. 29, 2024 USD ($) $ / shares

Jul. 01, 2023 USD ($)

Dec. 28, 2024 USD ($) property potentially_responsible_party smelter_site

Dec. 30, 2023 USD ($)

Dec. 31, 2022 USD ($)

Oct. 31, 2008 import_entry

Dec. 28, 2024 USD ($) potentially_responsible_party smelter_site property

Dec. 25, 2021 USD ($)

Dec. 29, 2018 potentially_responsible_party

Nov. 08, 2016 USD ($)

Apr. 19, 2010

Loss Contingencies [Line Items]

Environmental expense

$ 1,800

$ 700

$ 1,400

Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration]

Environmental reserves, Other current liabilities

Environmental reserves, Other current liabilities

Environmental reserves

$ 18,400

18,900

$ 18,400

Expected environmental expenditures for 2025

3,200

3,200

Expected environmental expenditures for 2026

1,200

1,200

Expected environmental expenditures for 2027

700

700

Expected environmental expenditures for 2028

800

800

Expected environmental expenditures for 2029

800

800

Expected environmental expenditures after 2029

11,700

11,700

Proceeds from Insurance Settlement, Gross

$ 29,500

Insurance deductible

$ 250

Insured event, gain (loss), pretax

$ 19,500

Insured event, gain per diluted share, after tax (in USD per share) | $ / shares

$ 0.13

Proceeds from insurance settlement

25,000

$ 24,500

$ 5,000

Insurance advances, net

35,000

Advances to insurance claim

$ 21,600

21,600

Letter of Credit

Loss Contingencies [Line Items]

Term of guarantees

1 year

Letter of Credit | Revolving Credit Facility

Loss Contingencies [Line Items]

Payments required to be made under guarantees, maximum

$ 28,800

$ 28,800

United States Department of Commerce Antidumping Review

Loss Contingencies [Line Items]

Assignment of antidumping duty rate on U.S. imports by Company subsidiaries (as a percent)

48.33%

Payment for interest and duties

$ 3,000

Number of import entries | import_entry

795

East La Harpe

Loss Contingencies [Line Items]

Number of parties involved in settlement negotiations | smelter_site

3

3

Southeast Kansas Sites

Loss Contingencies [Line Items]

Accrual for environmental loss contingencies, gross

$ 5,600

Geographic boundary of sites | ft

50

Southeast Kansas Sites | Non operating Properties

Loss Contingencies [Line Items]

Number of parties involved in settlement negotiations | smelter_site

3

Southeast Kansas Sites - East La Harpe | Non operating Properties

Loss Contingencies [Line Items]

Number of parties involved in settlement negotiations | potentially_responsible_party

2

2

2

Southeast Kansas Sites - Lanyon | Operating Properties

Loss Contingencies [Line Items]

Number of properties in remediation | property

1,371

1,371

EPA review, term

5 years

Number of surrounding properties | property

300

Shasta Area Mine Sites

Loss Contingencies [Line Items]

Period of permit, implementation of Best Management Practices

10 years

Environmental remediation expense spending

$ 1,300

Estimated remediation costs, term

30 years

Shasta Area Mine Sites | Minimum

Loss Contingencies [Line Items]

Estimated remediation costs

$ 13,200

Shasta Area Mine Sites | Maximum

Loss Contingencies [Line Items]

Estimated remediation costs

$ 14,900

Lead Refinery Site

Loss Contingencies [Line Items]

Environmental expense

$ 700

Number of surrounding properties | property

300

Amount other PRPs will pay to fund cleanup

$ 26,000

Financial guarantee

$ 1,000

Lead Refinery Site | Minimum

Loss Contingencies [Line Items]

Estimated remediation costs

2,300

Lead Refinery Site | Maximum

Loss Contingencies [Line Items]

Estimated remediation costs

$ 2,700

Lead Refinery Site | Non operating Properties

Loss Contingencies [Line Items]

Number of parties involved in settlement negotiations | potentially_responsible_party

2

2

Estimated remediation costs, term

12 years

Lead Refinery NPL Site

Loss Contingencies [Line Items]

Environmental reserves

$ 4,500

Number of UAOs | unilateralAdministrativeOrder

2

Number of PRPs | potentially_responsible_party

4

4

Site contingency, total costs

$ 25,000

Site contingency, amount agreed upon to pay PRPs for past costs

2,000

Site contingency, additional reimbursement of past costs

$ 700

Contingency charge

$ 7,600

Reserve for settlement

$ 3,300

Litigation settlement

$ 100

Bonita Peak Mining District

Loss Contingencies [Line Items]

Number of mining sites | mining_site

48

Mueller Copper Tube Products, Inc. | Operating Properties | Minimum

Loss Contingencies [Line Items]

Estimated remediation costs

$ 300

Income Taxes - Components of In

Income Taxes - Components of Income Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Domestic	$ 672,625	$ 722,153	$ 737,538
Foreign	147,837	123,079	138,493
Income before income taxes	$ 820,462	$ 845,232	$ 876,031

Income Taxes - Components of _2

Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Current tax expense:
Federal	$ 136,248	$ 144,111	$ 149,269
Foreign	37,269	39,167	36,719
State and local	32,426	32,694	41,214
Current tax expense	205,943	215,972	227,202
Deferred tax (benefit) expense:
Federal	1,617	4,806	(3,312)
Foreign	3,285	270	(192)
State and local	(5,769)	(286)	(376)
Deferred tax (benefit) expense	(867)	4,790	(3,880)
Income tax expense	$ 205,076	$ 220,762	$ 223,322

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Expected income tax expense	$ 172,297	$ 177,499	$ 183,967
State and local income tax, net of federal benefit	19,847	25,542	32,184
Effect of foreign statutory rates different from U.S. and other foreign adjustments	9,308	14,519	7,443
Investment in unconsolidated affiliates	2,114	1,226	206
Other, net	1,510	1,976	(478)
Income tax expense	$ 205,076	$ 220,762	$ 223,322

Income Taxes - Deferred Tax Ass

Income Taxes - Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Thousands	Dec. 28, 2024	Dec. 30, 2023
Deferred tax assets:
Inventories	$ 17,296	$ 19,162
Other postretirement benefits and accrued items	16,202	10,174
Other reserves	6,870	6,956
Foreign tax attributes	4,676	4,862
State tax attributes, net of federal benefit	3,932	6,728
Stock-based compensation	5,100	4,502
Lease liability	6,230	7,354
Basis difference in unconsolidated affiliates	11,649	11,509
Total deferred tax assets	71,955	71,247
Less valuation allowance	(16,692)	(23,078)
Deferred tax assets, net of valuation allowance	55,263	48,169
Deferred tax liabilities:
Property, plant, and equipment	52,405	42,980
Lease asset	6,670	7,776
Other liabilities	10,198	10,884
Total deferred tax liabilities	69,273	61,640
Net deferred tax liabilities	$ (14,010)	$ (13,471)

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
State net operating loss carryforwards with potential tax benefits	$ 3.9
Federal and foreign tax attributes with unlimited life	3.6
Federal and foreign tax attributes with potential tax benefits	1.1
Income taxes paid	$ 210.4	$ 219.6	$ 238.3

Equity (Details)

Equity (Details)	Dec. 28, 2024 shares
Equity [Abstract]
Authorization to repurchase shares of common stock (in shares)	40,000,000
Shares repurchased (in shares)	15,900,000

Stock-Based Compensation - Narr

Stock-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 26.8	$ 23.1	$ 17.8
Compensation for stock awards not yet recognized	$ 54.1
Compensation recognition period	2 years 8 months 12 days
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future issuance (in shares)	4,100,000
Stock options vesting period	5 years
Stock options expiration period	10 years
Stock options granted (in shares)	0	0	0
Total intrinsic value of options exercised	$ 9.4	$ 6.5	$ 5.9
Total fair value of options, vested	0	$ 1	$ 1.1
Aggregate intrinsic value of all outstanding options	$ 26.3
Weighted average remaining contractual term of all outstanding options	3 years 1 month 6 days
Weighted average exercise price (in dollars per share)	$ 15.38
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value of awards granted (in dollars per share)	$ 62.91	$ 36.88	$ 31.90
Aggregate intrinsic value	$ 36.3
Fair value of options vested	$ 4.8	$ 7.7	$ 4.9
Performance Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value of awards granted (in dollars per share)	$ 64.52
Weighted average grant-date fair value of options granted (in dollars per share)	$ 64.52	$ 37.63	$ 32.74
Aggregate intrinsic value	$ 139
Fair value of options vested	$ 15.8	$ 7

Stock-Based Compensation - Stoc

Stock-Based Compensation - Stock Award Activity (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Stock Options
Shares
Beginning balance (in shares)	626
Granted (in shares)	0
Added by Performance Factor (in share)	0
Exercised/Released (in shares)	(204)
Forfeited (in shares)	0
Ending balance (in shares)	422	626
Weighted Average Exercise Price
Beginning balance (in dollars per share)	$ 14.78
Exercised/Released (in dollars per share)	13.52
Ending balance (in dollars per share)	$ 15.39	$ 14.78
Shares
Added by Performance Factor (in share)	0
Restricted Stock Awards
Shares
Added by Performance Factor (in share)	0
Shares
Beginning balance (in shares)	664
Granted (in shares)	71
Added by Performance Factor (in share)	0
Exercised/Released (in shares)	(273)
Forfeited (in shares)	(7)
Ending balance (in shares)	455	664
Weighted Average Grant Date Fair Value
Beginning balance (in dollars per share)	$ 20.51
Granted (in dollars per share)	62.91	$ 36.88	$ 31.90
Exercised/Released (in dollars per share)	17.51
Forfeited (in dollars per share)	26.39
Ending balance (in dollars per share)	$ 28.83	$ 20.51
Performance Stock Awards
Shares
Added by Performance Factor (in share)	283
Shares
Beginning balance (in shares)	1,902
Granted (in shares)	370
Added by Performance Factor (in share)	283
Exercised/Released (in shares)	(806)
Forfeited (in shares)	(10)
Ending balance (in shares)	1,739	1,902
Weighted Average Grant Date Fair Value
Beginning balance (in dollars per share)	$ 27.63
Granted (in dollars per share)	64.52
Added by Performance Factor (in dollars per share)	21.73
Exercised/Released (in dollars per share)	19.59
Forfeited (in dollars per share)	14.61
Ending balance (in dollars per share)	$ 38.33	$ 27.63

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) - Changes in AOCI by Component, Net of Taxes and Noncontrolling Interest (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023
Changes in accumulated other comprehensive income [Roll Forward]
Balance at beginning of year	$ 2,358,716
Other comprehensive income (loss) before reclassifications	(32,269)	$ 19,726
Amounts reclassified from AOCI	(789)	(2,772)
Balance at end of year	2,804,408	2,358,716
Total
Changes in accumulated other comprehensive income [Roll Forward]
Balance at beginning of year	(47,221)	(64,175)
Balance at end of year	(80,279)	(47,221)
Cumulative Translation Adjustment
Changes in accumulated other comprehensive income [Roll Forward]
Balance at beginning of year	(48,076)	(69,238)
Other comprehensive income (loss) before reclassifications	(27,850)	21,162
Amounts reclassified from AOCI	0	0
Balance at end of year	(75,926)	(48,076)
Unrealized Gain (Loss) on Derivatives
Changes in accumulated other comprehensive income [Roll Forward]
Balance at beginning of year	213	1,486
Other comprehensive income (loss) before reclassifications	182	1,146
Amounts reclassified from AOCI	(586)	(2,419)
Balance at end of year	(191)	213
Pension/ OPEB Liability Adjustment
Changes in accumulated other comprehensive income [Roll Forward]
Balance at beginning of year	(2,630)	1,222
Other comprehensive income (loss) before reclassifications	(3,449)	(3,499)
Amounts reclassified from AOCI	(203)	(353)
Balance at end of year	(6,282)	(2,630)
Attributable to Unconsol. Affiliates
Changes in accumulated other comprehensive income [Roll Forward]
Balance at beginning of year	3,272	2,355
Other comprehensive income (loss) before reclassifications	(1,152)	917
Amounts reclassified from AOCI	0	0
Balance at end of year	$ 2,120	$ 3,272

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income (Loss) - Reclassification Adjustments out of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 28, 2024	Sep. 28, 2024	Jun. 29, 2024	Mar. 30, 2024	Dec. 30, 2023	Sep. 30, 2023	Jul. 01, 2023	Apr. 01, 2023	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Affected Line Item
Income tax expense (benefit)									$ 205,076	$ 220,762	$ 223,322
Net of tax and noncontrolling interests	$ (137,652)	$ (168,699)	$ (160,165)	$ (138,363)	$ (119,238)	$ (132,709)	$ (177,711)	$ (173,239)	(604,879)	(602,897)	(658,316)
Other (expense) income, net									2,946	(3,618)	(4,715)
Unrealized losses (gains) on derivatives Commodity contracts | Amount reclassified from AOCI
Affected Line Item
Income tax expense (benefit)									159	690	(2,225)
Net of tax and noncontrolling interests									(586)	(2,419)	7,666
Amortization of net loss (gain) and prior service cost on employee benefit plans | Amount reclassified from AOCI
Affected Line Item
Income tax expense (benefit)									57	98	332
Net of tax and noncontrolling interests									(203)	(353)	(945)
Other (expense) income, net									(260)	(451)	(1,277)
Commodity contracts | Unrealized losses (gains) on derivatives Commodity contracts | Amount reclassified from AOCI
Affected Line Item
Cost of goods sold									$ (745)	$ (3,109)	$ 9,891

Quarterly Financial Informati_3

Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 28, 2024	Sep. 28, 2024	Jun. 29, 2024	Mar. 30, 2024	Dec. 30, 2023	Sep. 30, 2023	Jul. 01, 2023	Apr. 01, 2023	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 923,536	$ 997,831	$ 997,745	$ 849,654	$ 732,377	$ 819,792	$ 896,984	$ 971,192	$ 3,768,766	$ 3,420,345	$ 3,982,455
Gross Profit	255,370	275,362	272,755	240,951	195,994	240,734	257,712	292,394
Consolidated net income	140,603	171,783	163,447	141,709	119,296	135,709	179,551	175,093	617,542	609,649	662,820
Net income attributable to Mueller Industries, Inc.	$ 137,652	$ 168,699	$ 160,165	$ 138,363	$ 119,238	$ 132,709	$ 177,711	$ 173,239	$ 604,879	$ 602,897	$ 658,316
Basic earnings per share (in dollars per share)	$ 1.23	$ 1.51	$ 1.44	$ 1.24	$ 1.07	$ 1.19	$ 1.60	$ 1.56	$ 5.43	$ 5.41	$ 5.90
Diluted earnings per share (in dollars per share)	1.21	1.48	1.41	1.21	1.05	1.17	1.56	1.54	5.31	5.30	5.82
Dividends per share (in dollars per share)	$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.15	$ 0.15	$ 0.15	$ 0.15	$ 0.80	$ 0.60	$ 0.50

Related Party Transactions (Det

Related Party Transactions (Details) - Non-Controlling Interest in South Korean Joint Venture - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023
Related Party Transaction [Line Items]
Ownership of copper mill (as a percent)	100%
Related party purchases	$ 19	$ 15.5
Related party payables	$ 0.5

Schedule II - Valuation And Q_2

Schedule II - Valuation And Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Allowance for doubtful accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	$ 2,830	$ 2,687	$ 2,590
Charged to costs and expenses	1,147	(84)	323
Other additions	5	227	0
Deductions	258	0	226
Balance at end of year	3,724	2,830	2,687
Environmental reserves
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	18,940	20,534	27,426
Charged to costs and expenses	1,785	652	1,367
Other additions	0	0	0
Deductions	2,311	2,246	8,259
Balance at end of year	18,414	18,940	20,534
Valuation allowance for deferred tax assets
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	23,078	21,504	26,624
Charged to costs and expenses	(4,931)	4,939	(1,648)
Other additions	0	267	509
Deductions	1,455	3,632	3,981
Balance at end of year	$ 16,692	$ 23,078	$ 21,504