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Segment Information - Net Sales by Major Product Line (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 29, 2018 | Sep. 30, 2017 | Sep. 29, 2018 | Sep. 30, 2017
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Net sales | $ 645,958 | $ 550,363 | [1] | $ 1,948,791 | $ 1,742,549 | [1]
Operating Segments [Member] |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Net sales | 650,853 | 564,144 |  | 1,963,458 | 1,761,019 |
Operating Segments [Member] | Piping Systems [Member] |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Net sales | 410,525 | 384,078 |  | 1,294,672 | 1,205,697 |
Operating Segments [Member] | Industrial Metals [Member] |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Net sales | 158,709 | 147,578 |  | 511,932 | 451,919 |
Operating Segments [Member] | Climate [Member] |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Net sales | 81,619 | 32,488 |  | 156,854 | 103,403 |
Operating Segments [Member] | Tube and fittings [Member] |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Net sales | 340,269 | 319,115 |  | 1,077,525 | 945,914 |
Operating Segments [Member] | Tube and fittings [Member] | Piping Systems [Member] |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Net sales | 340,269 | 319,115 |  | 1,077,525 | 945,914 |
Operating Segments [Member] | Tube and fittings [Member] | Industrial Metals [Member] |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Net sales | 0 | 0 |  | 0 | 0 |
Operating Segments [Member] | Tube and fittings [Member] | Climate [Member] |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Net sales | 0 | 0 |  | 0 | 0 |
Operating Segments [Member] | Brass rod and forgings [Member] |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Net sales | 122,411 | 112,592 |  | 394,880 | 346,555 |
Operating Segments [Member] | Brass rod and forgings [Member] | Piping Systems [Member] |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Net sales | 0 | 0 |  | 0 | 0 |
Operating Segments [Member] | Brass rod and forgings [Member] | Industrial Metals [Member] |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Net sales | 122,411 | 112,592 |  | 394,880 | 346,555 |
Operating Segments [Member] | Brass rod and forgings [Member] | Climate [Member] |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Net sales | 0 | 0 |  | 0 | 0 |
Operating Segments [Member] | OEM components, tube and assemblies [Member] |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Net sales | 55,465 | 52,501 |  | 174,874 | 229,198 |
Operating Segments [Member] | OEM components, tube and assemblies [Member] | Piping Systems [Member] |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Net sales | 7,618 | 6,962 |  | 22,128 | 86,642 |
Operating Segments [Member] | OEM components, tube and assemblies [Member] | Industrial Metals [Member] |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Net sales | 12,292 | 13,051 |  | 41,956 | 39,153 |
Operating Segments [Member] | OEM components, tube and assemblies [Member] | Climate [Member] |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Net sales | 35,555 | 32,488 |  | 110,790 | 103,403 |
Operating Segments [Member] | Valves and plumbing specialties [Member] |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Net sales | 62,638 | 58,001 |  | 195,019 | 173,141 |
Operating Segments [Member] | Valves and plumbing specialties [Member] | Piping Systems [Member] |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Net sales | 62,638 | 58,001 |  | 195,019 | 173,141 |
Operating Segments [Member] | Valves and plumbing specialties [Member] | Industrial Metals [Member] |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Net sales | 0 | 0 |  | 0 | 0 |
Operating Segments [Member] | Valves and plumbing specialties [Member] | Climate [Member] |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Net sales | 0 | 0 |  | 0 | 0 |
Operating Segments [Member] | Other products [Member] |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Net sales | 70,070 | 21,935 |  | 121,160 | 66,211 |
Operating Segments [Member] | Other products [Member] | Piping Systems [Member] |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Net sales | 0 | 0 |  | 0 | 0 |
Operating Segments [Member] | Other products [Member] | Industrial Metals [Member] |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Net sales | 24,006 | 21,935 |  | 75,096 | 66,211 |
Operating Segments [Member] | Other products [Member] | Climate [Member] |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Net sales | 46,064 | 0 |  | 46,064 | 0 |
Intersegment Sales [Member] |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Net sales | $ (4,895) | $ (13,781) |  | $ (14,667) | $ (18,470) |
[1] | The Condensed Consolidated Statements of Income for the quarter and nine months ended September 30, 2017 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 (expense), net in the Condensed Consolidated Statements of Income. Refer to Note 1 for further discussion.

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