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BUSINESS SEGMENTS (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Apr. 01, 2017 | Mar. 26, 2016
Business Segments |  |
Net sales | $ 637,473 | $ 596,605
Operating income | 64,502 | 62,365
Inventory Valuation [Member] |  |
Business Segments |  |
Operating income | (779) | 2,027
Engineered Support Structures Segment |  |
Business Segments |  |
Net sales | 160,351 | 165,959
Operating income | 9,213 | 12,475
Energy and Mining Segment |  |
Business Segments |  |
Net sales | 77,972 | 70,791
Operating income | 3,837 | 1,902
Utility Support Structures Segment |  |
Business Segments |  |
Net sales | 174,377 | 144,344
Operating income | 22,708 | 14,424
Coatings Segment |  |
Business Segments |  |
Net sales | 59,332 | 58,768
Operating income | 9,406 | 11,413
Irrigation Segment |  |
Business Segments |  |
Net sales | 165,441 | 156,743
Operating income | 30,291 | 28,895
Corporate |  |
Business Segments |  |
Operating income | (10,174) | (8,771)
Operating Segment |  |
Business Segments |  |
Sales | 673,834 | 621,035
Operating Segment | Engineered Support Structures Segment |  |
Business Segments |  |
Sales | 180,558 | 176,971
Operating Segment | Engineered Support Structures Segment | Lighting, Traffic, and Roadway Products |  |
Business Segments |  |
Sales | 149,082 | 146,302
Operating Segment | Engineered Support Structures Segment | Communication Products |  |
Business Segments |  |
Sales | 31,476 | 30,669
Operating Segment | Energy and Mining Segment |  |
Business Segments |  |
Sales | 77,972 | 72,449
Operating Segment | Energy and Mining Segment | Offshore Structures |  |
Business Segments |  |
Sales | 25,707 | 22,969
Operating Segment | Energy and Mining Segment | Grinding Media [Member] |  |
Business Segments |  |
Sales | 19,594 | 19,490
Operating Segment | Energy and Mining Segment | Access Systems |  |
Business Segments |  |
Sales | 32,671 | 29,990
Operating Segment | Utility Support Structures Segment |  |
Business Segments |  |
Sales | 174,612 | 144,520
Operating Segment | Utility Support Structures Segment | Steel |  |
Business Segments |  |
Sales | 148,408 | 121,971
Operating Segment | Utility Support Structures Segment | Concrete |  |
Business Segments |  |
Sales | 26,204 | 22,549
Operating Segment | Coatings Segment |  |
Business Segments |  |
Sales | 73,468 | 68,581
Operating Segment | Irrigation Segment |  |
Business Segments |  |
Sales | 167,224 | 158,514
Intersegment |  |
Business Segments |  |
Sales | 36,361 | 24,430
Intersegment | Engineered Support Structures Segment |  |
Business Segments |  |
Sales | 20,207 | 11,012
Intersegment | Energy and Mining Segment |  |
Business Segments |  |
Sales | 0 | 1,658
Intersegment | Utility Support Structures Segment |  |
Business Segments |  |
Sales | 235 | 176
Intersegment | Coatings Segment |  |
Business Segments |  |
Sales | 14,136 | 9,813
Intersegment | Irrigation Segment |  |
Business Segments |  |
Sales | $ 1,783 | $ 1,771

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