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Goodwill and Other Intangible Assets (Details) - USD ($)
12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Dec. 26, 2015
Goodwill [Roll Forward]      
Goodwill   $ 169,657,000  
Accumulated impairment charges, beginning of year   (49,405,000)  
Goodwill, net, beginning balance $ 123,993,000 120,252,000  
Additions 3,852,000 [1] 4,601,000 [2]  
Currency translation 2,448,000 (860,000)  
Goodwill 179,698,000   $ 169,657,000
Accumulated impairment loss, end of year (49,405,000)   (49,405,000)
Goodwill, net, ending balance 130,293,000 123,993,000 120,252,000
Impairment charges 0 0 0
Great Lakes Copper, Inc [Member]      
Goodwill [Roll Forward]      
Purchase price allocation adjustments 4,100,000    
Jungwoo-Mueller [Member]      
Goodwill [Roll Forward]      
Purchase price allocation adjustments 200,000    
Piping Systems [Member]      
Goodwill [Roll Forward]      
Goodwill   156,387,000  
Accumulated impairment charges, beginning of year   (40,552,000)  
Goodwill, net, beginning balance 119,576,000 115,835,000  
Additions 3,852,000 [1] 4,601,000 [2]  
Currency translation 2,448,000 (860,000)  
Goodwill 166,428,000   156,387,000
Accumulated impairment loss, end of year (40,552,000)   (40,552,000)
Goodwill, net, ending balance 125,876,000 119,576,000 115,835,000
Industrial Metals [Member]      
Goodwill [Roll Forward]      
Goodwill   8,854,000  
Accumulated impairment charges, beginning of year   (8,853,000)  
Goodwill, net, beginning balance 1,000 1,000  
Additions 0 [1] 0 [2]  
Currency translation 0 0  
Goodwill 8,854,000   8,854,000
Accumulated impairment loss, end of year (8,853,000)   (8,853,000)
Goodwill, net, ending balance 1,000 1,000 1,000
Climate [Member]      
Goodwill [Roll Forward]      
Goodwill   4,416,000  
Accumulated impairment charges, beginning of year   0  
Goodwill, net, beginning balance 4,416,000 4,416,000  
Additions 0 [1] 0 [2]  
Currency translation 0 0  
Goodwill 4,416,000   4,416,000
Accumulated impairment loss, end of year 0   0
Goodwill, net, ending balance $ 4,416,000 $ 4,416,000 $ 4,416,000
[1] Includes finalization of the purchase price allocation adjustment for Jungwoo-Mueller of $0.2 million.
[2] Includes finalization of the purchase price allocation adjustment for Great Lakes of $4.1 million.