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ACQUISITIONS (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
0 Months Ended 12 Months Ended
Dec. 19, 2012
Pure Metal Galvanizing
item
Dec. 25, 2010
Delta
May 12, 2010
Delta
Jun. 30, 2011
Donhad
Jun. 30, 2011
Irrigation monitoring services company
Acquisition          
Cash paid for acquisition $ 45,687   $ 237,926 $ 25,253 $ 1,539
Fair value of contingent consideration 3,884        
Period at the end of which contingent consideration is to be paid 5 years        
Number of custom galvanizing operations 3        
Goodwill 12,676        
Customer relationships, trade name and other intangible assets 14,066        
Ownership percentage acquired       40.00% 60.00%
Pro forma results of operations          
Net sales   2,167,923      
Net earnings   $ 99,614      
Earnings per share-diluted   $ 3.77