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ACQUISITIONS - Narrative (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Mar. 26, 2016
Dec. 26, 2015
Acquisitions      
Goodwill   $ 334,269 $ 336,916
American Galvanizing      
Acquisitions      
Payments to Acquire Businesses, Net of Cash Acquired $ 12,778    
Annual sales 10,000    
Goodwill 3,019    
Intangible assets $ 2,178