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Segment Information - Net Sales by Major Product Line (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 30, 2019 | Mar. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | $ 611,781 | $ 640,060
Operating Segments [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 617,201 | 644,359
Operating Segments [Member] | Piping Systems [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 376,492 | 430,964
Operating Segments [Member] | Industrial Metals [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 150,875 | 177,332
Operating Segments [Member] | Climate [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 89,834 | 36,063
Operating Segments [Member] | Tube and fittings [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 307,521 | 358,091
Operating Segments [Member] | Tube and fittings [Member] | Piping Systems [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 307,521 | 358,091
Operating Segments [Member] | Tube and fittings [Member] | Industrial Metals [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 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
Operating Segments [Member] | Brass rod and forgings [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 115,924 | 136,548
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
Operating Segments [Member] | Brass rod and forgings [Member] | Industrial Metals [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 115,924 | 136,548
Operating Segments [Member] | Brass rod and forgings [Member] | Climate [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 0 | 0
Operating Segments [Member] | OEM components, tube and assemblies [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 57,563 | 58,192
Operating Segments [Member] | OEM components, tube and assemblies [Member] | Piping Systems [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 7,283 | 7,062
Operating Segments [Member] | OEM components, tube and assemblies [Member] | Industrial Metals [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 13,037 | 15,067
Operating Segments [Member] | OEM components, tube and assemblies [Member] | Climate [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 37,243 | 36,063
Operating Segments [Member] | Valves and plumbing specialties [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 61,688 | 65,811
Operating Segments [Member] | Valves and plumbing specialties [Member] | Piping Systems [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 61,688 | 65,811
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
Operating Segments [Member] | Valves and plumbing specialties [Member] | Climate [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 0 | 0
Operating Segments [Member] | Other products [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 74,505 | 25,717
Operating Segments [Member] | Other products [Member] | Piping Systems [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 0 | 0
Operating Segments [Member] | Other products [Member] | Industrial Metals [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 21,914 | 25,717
Operating Segments [Member] | Other products [Member] | Climate [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 52,591 | 0
Intersegment Sales [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | $ (5,420) | $ (4,299)

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