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GOODWILL AND INTANGIBLE ASSETS - Carrying Values of Trade Names - (Details) - USD ($)
$ in Thousands
Sep. 26, 2015
Dec. 27, 2014
Webforge    
Non-amortized intangible assets    
Carrying value of trade names $ 11,477 $ 16,801
Valmont SM    
Non-amortized intangible assets    
Carrying value of trade names 9,284 10,818
Newmark    
Non-amortized intangible assets    
Carrying value of trade names 11,111 11,111
Ingal EPS/Ingal Civil Products    
Non-amortized intangible assets    
Carrying value of trade names 8,668 8,867
Donhad    
Non-amortized intangible assets    
Carrying value of trade names 6,539 6,689
Shakespeare    
Non-amortized intangible assets    
Carrying value of trade names 4,000 4,000
Industrial Galvanizers    
Non-amortized intangible assets    
Carrying value of trade names 2,713 3,889
Other    
Non-amortized intangible assets    
Carrying value of trade names 13,567 14,852
Trade Names    
Non-amortized intangible assets    
Carrying value of trade names $ 67,359 $ 77,027