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Segment Information
 9 Months Ended
Sep. 24, 2022
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, Heatlink Group, 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. 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. 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.

Beginning in fiscal year 2022, the results of Precision Tube are included in the Industrial Metals segment prospectively as the impact to prior periods was not material. The business was previously reported in the Piping Systems segment. This change was made to reflect the Company’s internal management reporting structure.

Industrial Metals

Industrial Metals is composed of the following operating segments: Brass Rod, Impacts & Micro Gauge, Brass Value-Added Products, and Precision Tube.  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, and gas assemblies.  These products are manufactured in the U.S. and sold primarily to OEMs in the U.S., many of which are in the industrial, transportation, construction, heating, ventilation, and air-conditioning, plumbing, refrigeration, and energy markets.

Climate

Climate is composed of the following operating segments: Refrigeration Products, Westermeyer, Turbotec, Flex Duct, and Linesets, Inc. These domestic businesses manufacture 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 September 24, 2022
(In thousands)Piping SystemsIndustrial MetalsClimateCorporate and EliminationsTotal
Net sales$634,808 $144,880 $174,650 $(9,508)$944,830 
Cost of goods sold440,216 128,152 114,850 (4,581)678,637 
Depreciation and amortization5,516 1,846 2,289 1,199 10,850 
Selling, general, and administrative expense21,137 2,805 10,049 16,187 50,178 
Operating income167,939 12,077 47,462 (22,313)205,165 
Interest expense    (361)
Other income (expense), net    1,030 
Income before income taxes    $205,834 

 For the Quarter Ended September 25, 2021
(In thousands)Piping SystemsIndustrial MetalsClimateCorporate and EliminationsTotal
Net sales$688,200 $182,245 $122,252 $(10,449)$982,248 
Cost of goods sold506,703 158,822 89,175 (10,435)744,265 
Depreciation and amortization5,547 1,661 2,484 1,176 10,868 
Selling, general, and administrative expense23,751 2,710 9,521 12,542 48,524 
Gain on sale of businesses— — — (54,759)(54,759)
Operating income152,199 19,052 21,072 41,027 233,350 
Interest expense    (1,116)
Other loss, net    (2,548)
Income before income taxes    $229,686 
Segment information (continued):

For the Nine Months Ended September 24, 2022
(In thousands)Piping SystemsIndustrial MetalsClimateCorporate and EliminationsTotal
Net sales$2,163,045 $498,367 $479,756 $(36,294)$3,104,874 
Cost of goods sold1,539,493 424,802 311,917 (32,150)2,244,062 
Depreciation and amortization16,846 5,636 6,989 3,522 32,993 
Selling, general, and administrative expense66,700 8,425 25,941 45,524 146,590 
Gain on sale of assets— — (5,507)(5,507)
Operating income540,006 59,504 134,909 (47,683)686,736 
Interest expense(666)
Other income, net4,013 
Income before income taxes$690,083 

For the Nine Months Ended September 25, 2021
(In thousands)Piping SystemsIndustrial MetalsClimateCorporate and EliminationsTotal
Net sales$1,947,564 $527,137 $364,986 $(26,699)$2,812,988 
Cost of goods sold1,515,335 455,112 269,560 (27,612)2,212,395 
Depreciation and amortization17,272 5,098 7,866 3,521 33,757 
Selling, general, and administrative expense71,152 8,529 23,781 34,429 137,891 
Gain on sale of businesses— — — (54,759)(54,759)
Operating income343,805 58,398 63,779 17,722 483,704 
Interest expense(7,451)
Redemption premium(5,674)
Other loss, net(1,288)
Income before income taxes$469,291 
The following table presents total assets attributable to each segment:

(In thousands)September 24, 2022December 25, 2021
Segment assets:
Piping Systems$1,169,693 $1,160,272 
Industrial Metals169,385 173,290 
Climate287,387 250,107 
General Corporate483,286 145,267 
$2,109,751 $1,728,936 

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

For the Quarter Ended September 24, 2022
(In thousands)Piping SystemsIndustrial MetalsClimateTotal
Tube and fittings$520,842 $— $— $520,842 
Brass rod and forgings— 114,956 — 114,956 
OEM components, tube & assemblies— 16,819 30,180 46,999 
Valves and plumbing specialties113,966 — — 113,966 
Flex duct and other HVAC components— — 144,470 144,470 
Other— 13,105 — 13,105 
 634,808 144,880 174,650 954,338 
Intersegment sales(9,508)
Net sales$944,830 

For the Quarter Ended September 25, 2021
(In thousands)Piping SystemsIndustrial MetalsClimateTotal
Tube and fittings$555,161 $— $— $555,161 
Brass rod and forgings— 143,788 — 143,788 
OEM components, tube & assemblies6,943 12,076 29,627 48,646 
Valves and plumbing specialties126,096 — — 126,096 
Flex duct and other HVAC components— — 92,625 92,625 
Other— 26,381 — 26,381 
 688,200 182,245 122,252 992,697 
Intersegment sales(10,449)
Net sales$982,248 
Disaggregation of revenue from contracts with customers (continued):

For the Nine Months Ended September 24, 2022
(In thousands)Piping SystemsIndustrial MetalsClimateTotal
Tube and fittings$1,766,931 $— $— $1,766,931 
Brass rod and forgings— 394,277 — 394,277 
OEM components, tube & assemblies— 57,169 91,798 148,967 
Valves and plumbing specialties396,114 — — 396,114 
Flex duct and other HVAC components— — 387,958 387,958 
Other— 46,921 — 46,921 
2,163,045 498,367 479,756 3,141,168 
Intersegment sales(36,294)
Net sales$3,104,874 

For the Nine Months Ended September 25, 2021
(In thousands)Piping SystemsIndustrial MetalsClimateTotal
Tube and fittings$1,548,392 $— $— $1,548,392 
Brass rod and forgings— 418,024 — 418,024 
OEM components, tube & assemblies23,954 35,819 111,143 170,916 
Valves and plumbing specialties375,218 — — 375,218 
Flex duct and other HVAC components— — 253,843 253,843 
Other— 73,294 — 73,294 
1,947,564 527,137 364,986 2,839,687 
Intersegment sales(26,699)
Net sales$2,812,988