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BUSINESS SEGMENTS (Details) $ in Thousands | 3 Months Ended
--- | ---
Mar. 26, 2016 USD ($) segment | Mar. 28, 2015 USD ($)
Business Segments |  |
Number of reportable segments | segment | 5 |
Maximum percentage of sales of other businesses and activities to consolidated sales as basis for aggregation | 1.00% |
Net sales | $ 596,605 | $ 670,398
Operating income | 62,365 | 57,683
Engineered Support Structures Segment |  |
Business Segments |  |
Net sales | 165,959 | 170,798
Operating income | 14,208 | 9,450
Energy and Mining Segment [Member] |  |
Business Segments |  |
Net sales | 70,791 | 88,012
Operating income | 1,902 | 4,366
Utility Support Structures Segment |  |
Business Segments |  |
Net sales | 144,344 | 176,052
Operating income | 14,768 | 15,357
Coatings Segment |  |
Business Segments |  |
Net sales | 58,768 | 61,813
Operating income | 11,413 | 10,999
Irrigation Segment |  |
Business Segments |  |
Net sales | 156,743 | 172,853
Operating income | 28,845 | 30,174
Other |  |
Business Segments |  |
Net sales | 0 | 870
Operating income | 0 | (1,108)
Corporate |  |
Business Segments |  |
Operating income | (8,771) | (11,555)
Operating Segment |  |
Business Segments |  |
Sales | 621,035 | 693,412
Operating Segment | Engineered Support Structures Segment |  |
Business Segments |  |
Sales | 176,971 | 177,904
Operating Segment | Engineered Support Structures Segment | Lighting, Traffic, and Roadway Products |  |
Business Segments |  |
Sales | 146,302 | 145,348
Operating Segment | Engineered Support Structures Segment | Communication Products |  |
Business Segments |  |
Sales | 30,669 | 32,556
Operating Segment | Energy and Mining Segment [Member] |  |
Business Segments |  |
Sales | 72,449 | 88,061
Operating Segment | Energy and Mining Segment [Member] | Offshore Structures |  |
Business Segments |  |
Sales | 22,969 | 24,848
Operating Segment | Energy and Mining Segment [Member] | Grinding Media [Member] |  |
Business Segments |  |
Sales | 19,490 | 27,491
Operating Segment | Energy and Mining Segment [Member] | Access Systems |  |
Business Segments |  |
Sales | 29,990 | 35,722
Operating Segment | Utility Support Structures Segment |  |
Business Segments |  |
Sales | 144,520 | 176,341
Operating Segment | Utility Support Structures Segment | Steel |  |
Business Segments |  |
Sales | 121,971 | 158,273
Operating Segment | Utility Support Structures Segment | Concrete |  |
Business Segments |  |
Sales | 22,549 | 18,068
Operating Segment | Coatings Segment |  |
Business Segments |  |
Sales | 68,581 | 74,360
Operating Segment | Irrigation Segment |  |
Business Segments |  |
Sales | 158,514 | 174,577
Operating Segment | Other |  |
Business Segments |  |
Sales | 0 | 2,169
Intersegment |  |
Business Segments |  |
Sales | 24,430 | 23,014
Intersegment | Engineered Support Structures Segment |  |
Business Segments |  |
Sales | 11,012 | 7,106
Intersegment | Energy and Mining Segment [Member] |  |
Business Segments |  |
Sales | 1,658 | 49
Intersegment | Utility Support Structures Segment |  |
Business Segments |  |
Sales | 176 | 289
Intersegment | Coatings Segment |  |
Business Segments |  |
Sales | 9,813 | 12,547
Intersegment | Irrigation Segment |  |
Business Segments |  |
Sales | 1,771 | 1,724
Intersegment | Other |  |
Business Segments |  |
Sales | $ 0 | $ 1,299

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