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Segment Information
 6 Months Ended
Jun. 29, 2024
Segment Reporting [Abstract]  
Segment Information Segment Information
Each of the Company’s 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, 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 original equipment manufacturers (OEMs).

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, 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. The segment manufactures and sells refrigeration valves and fittings, 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.
Summarized segment information is as follows:

 For the Quarter Ended June 29, 2024
(In thousands)Piping SystemsIndustrial MetalsClimateCorporate and EliminationsTotal
Net sales$688,469 $195,341 $130,532 $(16,597)$997,745 
Cost of goods sold500,826 159,265 82,291 (17,392)724,990 
Depreciation and amortization4,932 2,368 1,646 1,072 10,018 
Selling, general, and administrative expense20,453 4,015 7,602 20,661 52,731 
Operating income162,258 29,693 38,993 (20,938)210,006 
Interest expense    (107)
Interest income14,383 
Other expense, net    (1,356)
Income before income taxes    $222,926 

 For the Quarter Ended July 1, 2023
(In thousands)Piping SystemsIndustrial MetalsClimateCorporate and EliminationsTotal
Net sales$638,005 $146,266 $123,954 $(11,241)$896,984 
Cost of goods sold452,866 123,097 77,064 (13,755)639,272 
Depreciation and amortization5,252 1,804 2,202 1,158 10,416 
Selling, general, and administrative expense28,745 3,394 7,087 16,836 56,062 
Gain on insurance settlement— — (19,466)— (19,466)
Operating income151,142 17,971 57,067 (15,480)210,700 
Interest expense    (135)
Interest income7,732 
Realized and unrealized gains on short-term investments20,820 
Other income, net    1,841 
Income before income taxes    $240,958 
Segment information (continued):

For the Six Months Ended June 29, 2024
(In thousands)Piping SystemsIndustrial MetalsClimateCorporate and EliminationsTotal
Net sales$1,278,637 $351,408 $247,342 $(29,988)$1,847,399 
Cost of goods sold921,767 285,869 157,882 (31,825)1,333,693 
Depreciation and amortization9,492 4,288 3,241 2,166 19,187 
Selling, general, and administrative expense42,440 7,287 14,651 36,710 101,088 
Operating income304,938 53,964 71,568 (37,039)393,431 
Interest expense(222)
Interest income31,628 
Realized and unrealized gains on short-term investments365 
Other expense, net(726)
Income before income taxes$424,476 

For the Six Months Ended July 1, 2023
( In thousands)Piping SystemsIndustrial MetalsClimateCorporate and EliminationsTotal
Net sales$1,300,484 $311,500 $276,908 $(20,716)$1,868,176 
Cost of goods sold920,476 256,267 165,876 (24,549)1,318,070 
Depreciation and amortization10,810 3,576 4,355 2,332 21,073 
Selling, general, and administrative expense54,202 6,471 15,088 32,932 108,693 
Gain on insurance settlement— — (19,466)— (19,466)
Operating income314,996 45,186 111,055 (31,431)439,806 
Interest expense(278)
Interest income13,967 
Realized and unrealized gains on short-term investments22,730 
Other income, net2,167 
Income before income taxes$478,392 
The following table presents total assets attributable to each segment:

(In thousands)June 29,
2024		December 30, 2023
Segment assets:
Piping Systems$1,112,550 $1,029,821 
Industrial Metals821,011 157,761 
Climate275,872 252,561 
General Corporate856,752 1,319,158 
$3,066,185 $2,759,301 

The following tables represent a disaggregation of revenue from contracts with customers, along with the reportable segment for each category:

For the Quarter Ended June 29, 2024
(In thousands)Piping SystemsIndustrial MetalsClimateTotal
Tube and fittings$568,849 $— $— $568,849 
Brass rod and forgings— 131,709 — 131,709 
OEM components, tube & assemblies— 20,418 30,569 50,987 
Valves and plumbing specialties119,620 — — 119,620 
Flex duct and other HVAC components— — 99,963 99,963 
Other— 43,214 — 43,214 
 688,469 195,341 130,532 1,014,342 
Intersegment sales(16,597)
Net sales$997,745 

For the Quarter Ended July 1, 2023
(In thousands)Piping SystemsIndustrial MetalsClimateTotal
Tube and fittings$518,712 $— $— $518,712 
Brass rod and forgings— 113,563 — 113,563 
OEM components, tube & assemblies— 21,073 33,007 54,080 
Valves and plumbing specialties119,293 — — 119,293 
Flex duct and other HVAC components— — 90,947 90,947 
Other— 11,630 — 11,630 
 638,005 146,266 123,954 908,225 
Intersegment sales(11,241)
Net sales$896,984 
Disaggregation of revenue from contracts with customers (continued):

For the Six Months Ended June 29, 2024
(In thousands)Piping SystemsIndustrial MetalsClimateTotal
Tube and fittings$1,047,325 $— $— $1,047,325 
Brass rod and forgings— 255,768 — 255,768 
OEM components, tube & assemblies— 39,375 60,586 99,961 
Valves and plumbing specialties231,312 — — 231,312 
Flex duct and other HVAC components— — 186,756 186,756 
Other— 56,265 — 56,265 
 1,278,637 351,408 247,342 1,877,387 
Intersegment sales(29,988)
Net sales$1,847,399 

For the Six Months Ended July 1, 2023
(In thousands)Piping SystemsIndustrial MetalsClimateTotal
Tube and fittings$1,062,940 $— $— $1,062,940 
Brass rod and forgings— 243,903 — 243,903 
OEM components, tube & assemblies— 43,582 66,409 109,991 
Valves and plumbing specialties237,544 — — 237,544 
Flex duct and other HVAC components— — 210,499 210,499 
Other— 24,015 — 24,015 
1,300,484 311,500 276,908 1,888,892 
Intersegment sales(20,716)
Net sales$1,868,176