Segment Information - Summary of Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales	$ 543,839	$ 608,602	$ 666,394	$ 611,781	$ 559,087	$ 645,958	$ 662,773	$ 640,060	$ 2,430,616	$ 2,507,878	$ 2,266,073	[1]
Cost of goods sold									2,035,610	2,150,400	1,940,617	[1]
Depreciation and amortization									42,693	39,555	33,944	[1]
Selling, general, and administrative expense									162,358	148,888	140,730	[1]
Gain on sale of assets, net									(963)	(253)	(1,491)	[1],[2]
(Gain) loss on sale of assets, net									0	0	(1,491)
Insurance recovery									485	3,681	0	[1]
Impairment charges									0	0	1,466	[1],[2]
Operating income									191,403	172,969	150,807	[1]
Interest expense									(25,683)	(25,199)	(19,502)	[1]
Environmental expense									(1,321)	(1,320)	(7,284)	[1]
Other income, net									1,684	3,967	2,951	[1]
Income before income taxes									166,083	150,417	126,972	[1]
Expenditures for long-lived assets									31,162	124,936	48,155
Impairment charges									0	0	1,466	[1],[2]
Segment assets	1,370,940				1,369,549				1,370,940	1,369,549	1,320,173
Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									2,453,044	2,525,763	2,298,529
Corporate Segment [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									(22,428)	(17,885)	(32,456)
Cost of goods sold									(25,230)	(18,152)	(34,368)
Depreciation and amortization									3,285	3,114	2,138
Selling, general, and administrative expense									44,444	43,597	43,252
Gain on sale of assets, net									0	3,141
(Gain) loss on sale of assets, net											0
Insurance recovery									0	0
Impairment charges											0
Operating income									(44,927)	(49,585)	(43,478)
Expenditures for long-lived assets									2,711	37	22,518
Impairment charges											0
Segment assets	162,921				130,670				162,921	130,670	232,609
Intersegment Eliminations [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									(22,428)	(17,885)	(32,456)
Piping Systems [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									1,542,456	1,645,633	1,564,950
Cost of goods sold									1,313,980	1,426,729	1,369,161
Depreciation and amortization									22,621	23,304	21,777
Selling, general, and administrative expense									75,170	74,864	74,441
Gain on sale of assets, net									(1,194)	(2,093)
(Gain) loss on sale of assets, net											(1,491)
Insurance recovery									0	0
Impairment charges											1,466
Operating income									131,879	122,829	99,596
Expenditures for long-lived assets									15,505	31,362	18,124
Impairment charges											1,466
Segment assets	796,262				818,303				796,262	818,303	801,468
Industrial Metals [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									554,372	651,061	602,131
Cost of goods sold									473,010	559,367	506,973
Depreciation and amortization									7,489	7,568	7,516
Selling, general, and administrative expense									12,359	13,501	13,278
Gain on sale of assets, net									275	(1,301)
(Gain) loss on sale of assets, net											0
Insurance recovery									485	(3,681)
Impairment charges											0
Operating income									61,724	75,607	74,364
Expenditures for long-lived assets									9,101	8,066	5,322
Impairment charges											0
Segment assets	161,904				173,725				161,904	173,725	212,638
Climate [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									356,216	229,069	131,448
Cost of goods sold									273,850	182,456	98,851
Depreciation and amortization									9,298	5,569	2,513
Selling, general, and administrative expense									30,385	16,926	9,759
Gain on sale of assets, net									(44)	0
(Gain) loss on sale of assets, net											0
Insurance recovery									0	0
Impairment charges											0
Operating income									42,727	24,118	20,325
Expenditures for long-lived assets									3,845	85,471	2,191
Impairment charges											0
Segment assets	$ 249,853				$ 246,851				249,853	246,851	73,458
Tube and fittings [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									1,271,558	1,352,875	1,238,258
Tube and fittings [Member] | Piping Systems [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									1,271,558	1,352,875	1,238,258
Tube and fittings [Member] | Industrial Metals [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									0	0	0
Tube and fittings [Member] | Climate [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									0	0	0
Brass rod and forgings [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									425,573	501,472	461,603
Brass rod and forgings [Member] | Piping Systems [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									0	0	0
Brass rod and forgings [Member] | Industrial Metals [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									425,573	501,472	461,603
Brass rod and forgings [Member] | Climate [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									0	0	0
OEM components, tube and assemblies [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									210,858	222,272	277,538
OEM components, tube and assemblies [Member] | Piping Systems [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									29,103	29,578	94,383
OEM components, tube and assemblies [Member] | Industrial Metals [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									48,104	53,581	51,707
OEM components, tube and assemblies [Member] | Climate [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									133,651	139,113	131,448
Valves and plumbing specialties [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									241,795	263,180	232,309
Valves and plumbing specialties [Member] | Piping Systems [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									241,795	263,180	232,309
Valves and plumbing specialties [Member] | Industrial Metals [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									0	0	0
Valves and plumbing specialties [Member] | Climate [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									0	0	0
Other products [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									303,260	185,964	88,821
Other products [Member] | Piping Systems [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									0	0	0
Other products [Member] | Industrial Metals [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									80,695	96,008	88,821
Other products [Member] | Climate [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									$ 222,565	$ 89,956	$ 0

[1] The Consolidated Statement of Income for 2017 has been adjusted to reflect the adoption of ASU 2017-07, Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost in 2018. 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.

[2] The Consolidated Statements of Cash Flows for prior periods have been adjusted to reflect the adoption of ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash. The Consolidated Statements of Cash Flows reflect the changes during the periods in the total of cash, cash equivalents, and restricted cash. Therefore, restricted cash activity is included with cash when reconciling the beginning-of-period and end-of-period total amounts shown.