GOODWILL AND INTANGIBLE ASSETS (Details 3) (USD $) In Thousands, unless otherwise specified	9 Months Ended			9 Months Ended			9 Months Ended
Sep. 27, 2014	Sep. 27, 2014 AgSense	Aug. 25, 2014 AgSense	Sep. 27, 2014 Engineered Infrastructure Products segment	Sep. 27, 2014 Utility Support Structures segment	Dec. 28, 2013 Utility Support Structures segment	Sep. 27, 2014 Coatings segment	Sep. 27, 2014 Irrigation segment	Sep. 27, 2014 Other
Carrying amount of goodwill
Balance at the beginning of the period	$ 349,632		$ 17,343	$ 175,442	$ 75,404	$ 75,404	$ 77,062	$ 2,420	$ 19,304
Acquisitions	31,660			14,317				17,343
Foreign currency translation	(7,148)			(6,194)			(729)	(18)	(207)
Balance at the end of the period	$ 374,144		$ 17,343	$ 183,565	$ 75,404	$ 75,404	$ 76,333	$ 19,745	$ 19,097
Ownership percentage acquired		51.00%	51.00%

Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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