ACQUISITIONS (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended	0 Months Ended
	Mar. 28, 2015	Oct. 06, 2014
Valmont SM
Major classes of acquired intangible assets and weighted-average amortization periods
Amount	$ 30,340
Shakespeare
Major classes of acquired intangible assets and weighted-average amortization periods
Amount		13,500
Backlog | Valmont SM
Major classes of acquired intangible assets and weighted-average amortization periods
Amount	3,145
Weighted Average Amortization Period	1 year 6 months
Customer Relationships | Valmont SM
Major classes of acquired intangible assets and weighted-average amortization periods
Amount	15,725
Weighted Average Amortization Period	12 years
Customer Relationships | Shakespeare
Major classes of acquired intangible assets and weighted-average amortization periods
Amount		9,500
Weighted Average Amortization Period		12 years
Trade names | Valmont SM
Major classes of acquired intangible assets and weighted-average amortization periods
Amount	11,470
Trade names | Shakespeare
Major classes of acquired intangible assets and weighted-average amortization periods
Amount		$ 4,000