Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2025	Jun. 29, 2024	Jun. 28, 2025	Jun. 29, 2024
Segment Reporting Information [Line Items]
Net sales	$ 1,138,173	$ 997,745	$ 2,138,338	$ 1,847,399
Corporate expenses	304,168	210,006	510,430	393,431
Interest expense	(17)	(107)	(42)	(222)
Interest income	8,222	14,383	18,123	31,628
Unrealized gains on short-term investments	13,212	0	8,202	365
Other expense, net	(1,142)	(1,356)	(1,050)	(726)
Income before income taxes	324,443	222,926	535,663	424,476
Piping Systems
Segment Reporting Information [Line Items]
Net sales	735,194	676,684	1,364,553	1,256,549
Industrial Metals
Segment Reporting Information [Line Items]
Net sales	265,808	190,872	513,598	344,023
Climate
Segment Reporting Information [Line Items]
Net sales	137,171	130,189	260,187	246,827
Operating Segments
Segment Reporting Information [Line Items]
Net sales	1,151,588	1,014,342	2,166,291	1,877,387
Manufacturing costs	811,195	749,987	1,565,397	1,379,857
Sales and marketing expense	13,050	11,150	25,837	21,529
Distribution expense	12,662	10,819	24,992	21,125
Other segment items	(8,853)	11,442	2,659	24,406
Segment operating income	323,534	230,944	547,406	430,470
Operating Segments | Piping Systems
Segment Reporting Information [Line Items]
Net sales	743,475	688,469	1,383,158	1,278,637
Manufacturing costs	495,170	504,774	957,635	929,300
Sales and marketing expense	8,053	6,620	16,307	12,926
Distribution expense	11,370	9,746	22,524	18,996
Other segment items	(21,414)	5,071	(21,768)	12,477
Segment operating income	250,296	162,258	408,460	304,938
Operating Segments | Industrial Metals
Segment Reporting Information [Line Items]
Net sales	270,598	195,341	522,511	351,408
Manufacturing costs	230,058	161,488	441,799	289,857
Sales and marketing expense	1,336	801	2,560	1,521
Distribution expense	742	572	1,446	1,155
Other segment items	7,852	2,787	16,012	4,911
Segment operating income	30,610	29,693	60,694	53,964
Operating Segments | Climate
Segment Reporting Information [Line Items]
Net sales	137,515	130,532	260,622	247,342
Manufacturing costs	85,967	83,725	165,963	160,700
Sales and marketing expense	3,661	3,729	6,970	7,082
Distribution expense	550	501	1,022	974
Other segment items	4,709	3,584	8,415	7,018
Segment operating income	42,628	38,993	78,252	71,568
Intersegment sales
Segment Reporting Information [Line Items]
Net sales	(13,415)	(16,597)	(27,953)	(29,988)
Intersegment sales | Piping Systems
Segment Reporting Information [Line Items]
Net sales	(8,281)	(11,785)	(18,605)	(22,088)
Intersegment sales | Industrial Metals
Segment Reporting Information [Line Items]
Net sales	(4,790)	(4,469)	(8,913)	(7,385)
Intersegment sales | Climate
Segment Reporting Information [Line Items]
Net sales	(344)	(343)	(435)	(515)
Corporate expenses
Segment Reporting Information [Line Items]
Corporate expenses	(19,366)	(20,938)	(36,976)	(37,039)
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment
Segment Reporting Information [Line Items]
Interest expense	(17)	(107)	(42)	(222)
Interest income	8,222	14,383	18,123	31,628
Unrealized gains on short-term investments	13,212		8,202	365
Other expense, net	$ (1,142)	$ (1,356)	$ (1,050)	$ (726)