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GOODWILL AND INTANGIBLE ASSETS (Details 3) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 12 Months Ended
Dec. 28, 2013
Dec. 29, 2012
Dec. 28, 2013
Engineered Infrastructure Products segment
Dec. 29, 2012
Engineered Infrastructure Products segment
Dec. 28, 2013
Utility Support Structures segment
Dec. 31, 2011
Utility Support Structures segment
Dec. 28, 2013
Coatings segment
Dec. 29, 2012
Coatings segment
Dec. 28, 2013
Irrigation segment
Dec. 29, 2012
Irrigation segment
Dec. 28, 2013
Other
Dec. 29, 2012
Other
Carrying amount of goodwill                        
Balance at the beginning of the period $ 330,791 $ 314,662 $ 155,185 $ 151,558 $ 77,141 $ 77,141 $ 77,053 $ 64,820 $ 2,517 $ 2,576 $ 18,895 $ 18,567
Acquisition 21,189 12,676 21,189         12,676        
Foreign currency translation (2,348) 3,453 (2,669) 3,627     9 (443) (97) (59) 409 328
Other     1,737   (1,737)              
Balance at the end of the period $ 349,632 $ 330,791 $ 175,442 $ 155,185 $ 75,404 $ 77,141 $ 77,062 $ 77,053 $ 2,420 $ 2,517 $ 19,304 $ 18,895