Segment Information - Summary of Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 29, 2018	Dec. 30, 2017		Dec. 31, 2016
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales	$ 559,087	$ 645,958	$ 662,773	$ 640,060	$ 523,524	$ 550,363	$ 614,266	$ 577,920	$ 2,507,878	$ 2,266,073	[1]	$ 2,055,622	[1]
Cost of goods sold									2,150,400	1,940,617	[1]	1,723,499	[1]
Depreciation and amortization									39,555	33,944	[1]	35,133	[1]
Selling, general, and administrative expense									148,888	140,730	[1]	135,811	[1]
Gain on sale of assets, net									(253)	(1,491)	[1],[2]	0	[1],[2]
(Gain) loss on sale of assets									0	(1,491)		0
Insurance recovery									(3,681)	0	[1]	0	[1]
Impairment charges					1,100				0	1,466	[1],[2]	6,778	[1],[2]
Operating income									172,969	150,807	[1]	154,401	[1]
Interest expense									(25,199)	(19,502)	[1]	(7,387)	[1]
Environmental expense									(1,320)	(7,284)	[1]	(1,279)	[1]
Other income, net									3,967	2,951	[1]	295	[1]
Income before income taxes									150,417	126,972	[1]	146,030	[1]
Expenditures for long-lived assets									124,936	48,155		61,688
Impairment charges					1,100				0	1,466	[1],[2]	6,778	[1],[2]
Segment assets	1,369,549				1,320,173				1,369,549	1,320,173		1,447,476
Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									2,525,763	2,298,529		2,070,407
Intersegment Eliminations [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									(17,885)	(32,456)		(14,785)
Cost of goods sold									(18,152)	(34,368)		(16,282)
Depreciation and amortization									3,114	2,138		2,113
Selling, general, and administrative expense									43,597	43,252		45,029
Gain on sale of assets, net									3,141	0
Insurance recovery									0
Impairment charges										0		0
Operating income									(49,585)	(43,478)		(45,645)
Impairment charges										0		0
Corporate Segment [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Expenditures for long-lived assets									37	22,518		55
Segment assets	130,670				232,609				130,670	232,609		393,367
Piping Systems [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									1,645,633	1,564,950		1,429,589
Cost of goods sold									1,426,729	1,369,161		1,228,949
Depreciation and amortization									23,304	21,777		22,421
Selling, general, and administrative expense									74,864	74,441		67,178
Gain on sale of assets, net									(2,093)	(1,491)
(Gain) loss on sale of assets										(1,500)
Insurance recovery									0
Impairment charges										1,466		6,115
Operating income									122,829	99,596		104,926
Expenditures for long-lived assets									31,362	18,124		56,286
Impairment charges										1,466		6,115
Segment assets	818,303				801,468				818,303	801,468		826,663
Industrial Metals [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									651,061	602,131		521,060
Cost of goods sold									559,367	506,973		420,905
Depreciation and amortization									7,568	7,516		8,162
Selling, general, and administrative expense									13,501	13,278		13,943
Gain on sale of assets, net									(1,301)	0
Insurance recovery									(3,681)
Impairment charges										0		663
Operating income									75,607	74,364		77,387
Expenditures for long-lived assets									8,066	5,322		3,302
Impairment charges										0		663
Segment assets	173,725				212,638				173,725	212,638		160,478
Climate [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									229,069	131,448		119,758
Cost of goods sold									182,456	98,851		89,927
Depreciation and amortization									5,569	2,513		2,437
Selling, general, and administrative expense									16,926	9,759		9,661
Gain on sale of assets, net									0	0
Insurance recovery									0
Impairment charges										0		0
Operating income									24,118	20,325		17,733
Expenditures for long-lived assets									85,471	2,191		2,045
Impairment charges										0		0
Segment assets	$ 246,851				$ 73,458				246,851	73,458		66,968
Tube and fittings [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									1,352,875	1,238,258		1,045,031
Tube and fittings [Member] | Piping Systems [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									1,352,875	1,238,258		1,045,031
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									501,472	461,603		369,363
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									501,472	461,603		369,363
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									222,272	277,538		334,353
OEM components, tube and assemblies [Member] | Piping Systems [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									29,578	94,383		145,017
OEM components, tube and assemblies [Member] | Industrial Metals [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									53,581	51,707		69,578
OEM components, tube and assemblies [Member] | Climate [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									139,113	131,448		119,758
Valves and plumbing specialties [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									263,180	232,309		239,541
Valves and plumbing specialties [Member] | Piping Systems [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									263,180	232,309		239,541
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									185,964	88,821		82,119
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									96,008	88,821		82,119
Other products [Member] | Climate [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									$ 89,956	$ 0		$ 0

[1] The Consolidated Statements of Income for prior periods have 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. 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. Refer to Note 1 for further discussion.

[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. Refer to Note 1 for further discussion.