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BUSINESS SEGMENTS (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 29, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 29, 2018 USD ($) | Sep. 30, 2017 USD ($) | Dec. 30, 2017 segment
Business Segments |  |  |  |  |
Number of Reportable Segments | segment |  |  |  |  | 4
Percentage of Sales to Total Consolidated Sales of Other Business Activities, Aggregated as Other, Maximum |  |  |  |  | 10.00%
Net sales | $ 678,692 | $ 680,779 | $ 2,059,781 | $ 2,030,989 |
Operating income | 38,360 | 60,090 | 165,990 | 203,196 |
Inventory Valuation [Member] |  |  |  |  |
Business Segments |  |  |  |  |
Operating income | (2,780) | (1,626) | (5,512) | (2,839) |
Engineered Support Structures Segment |  |  |  |  |
Business Segments |  |  |  |  |
Net sales | 248,431 | 244,675 | 710,388 | 669,029 |
Operating income | 16,499 | 16,986 | 36,411 | 46,738 |
Utility Support Structures Segment |  |  |  |  |
Business Segments |  |  |  |  |
Net sales | 217,943 | 203,574 | 624,333 | 613,226 |
Operating income | 2,090 | 22,845 | 46,298 | 69,446 |
Coatings Segment |  |  |  |  |
Business Segments |  |  |  |  |
Net sales | 74,547 | 67,680 | 217,544 | 191,612 |
Operating income | 14,373 | 14,577 | 41,108 | 36,091 |
Irrigation Segment |  |  |  |  |
Business Segments |  |  |  |  |
Net sales | 137,771 | 145,050 | 484,436 | 496,656 |
Operating income | 21,302 | 18,235 | 82,917 | 83,196 |
Other Segments |  |  |  |  |
Business Segments |  |  |  |  |
Operating income | 0 | (217) | (913) | 3,728 |
Corporate |  |  |  |  |
Business Segments |  |  |  |  |
Operating income | (13,124) | (10,710) | (34,319) | (33,164) |
Operating Segment |  |  |  |  |
Business Segments |  |  |  |  |
Sales | 700,401 | 700,894 | 2,134,135 | 2,102,941 |
Operating Segment | Engineered Support Structures Segment |  |  |  |  |
Business Segments |  |  |  |  |
Sales | 251,524 | 246,264 | 727,189 | 688,016 |
Operating Segment | Engineered Support Structures Segment | Lighting, Traffic, and Highway Safety Products |  |  |  |  |
Business Segments |  |  |  |  |
Sales | 183,184 | 165,031 | 522,558 | 467,307 |
Operating Segment | Engineered Support Structures Segment | Communication Products |  |  |  |  |
Business Segments |  |  |  |  |
Sales | 35,985 | 46,324 | 109,690 | 121,613 |
Operating Segment | Engineered Support Structures Segment | Access Systems |  |  |  |  |
Business Segments |  |  |  |  |
Sales | 32,355 | 34,909 | 94,941 | 99,096 |
Operating Segment | Utility Support Structures Segment |  |  |  |  |
Business Segments |  |  |  |  |
Sales | 218,269 | 204,809 | 625,850 | 615,678 |
Operating Segment | Utility Support Structures Segment | Steel |  |  |  |  |
Business Segments |  |  |  |  |
Sales | 161,847 | 160,952 | 471,947 | 472,385 |
Operating Segment | Utility Support Structures Segment | Concrete |  |  |  |  |
Business Segments |  |  |  |  |
Sales | 27,715 | 18,811 | 81,562 | 67,921 |
Operating Segment | Utility Support Structures Segment | Engineered Solar Tracker Solutions |  |  |  |  |
Business Segments |  |  |  |  |
Sales | 6,090 | 0 | 6,090 | 0 |
Operating Segment | Utility Support Structures Segment | Offshore and Other Complex Steel Structures |  |  |  |  |
Business Segments |  |  |  |  |
Sales | 22,617 | 25,046 | 66,251 | 75,372 |
Operating Segment | Coatings Segment |  |  |  |  |
Business Segments |  |  |  |  |
Sales | 90,433 | 82,593 | 266,952 | 235,842 |
Operating Segment | Irrigation Segment |  |  |  |  |
Business Segments |  |  |  |  |
Sales | 140,175 | 147,428 | 491,064 | 502,939 |
Corporate |  |  |  |  |
Business Segments |  |  |  |  |
Sales | 0 | 19,800 | 23,080 | 60,466 |
Net sales | 0 | 19,800 | 23,080 | 60,466 |
Intersegment |  |  |  |  |
Business Segments |  |  |  |  |
Sales | 21,709 | 20,115 | 74,354 | 71,952 |
Intersegment | Engineered Support Structures Segment |  |  |  |  |
Business Segments |  |  |  |  |
Sales | 3,093 | 1,589 | 16,801 | 18,987 |
Intersegment | Utility Support Structures Segment |  |  |  |  |
Business Segments |  |  |  |  |
Sales | 326 | 1,235 | 1,517 | 2,452 |
Intersegment | Coatings Segment |  |  |  |  |
Business Segments |  |  |  |  |
Sales | 15,886 | 14,913 | 49,408 | 44,230 |
Intersegment | Irrigation Segment |  |  |  |  |
Business Segments |  |  |  |  |
Sales | 2,404 | 2,378 | 6,628 | 6,283 |
Intersegment | Other Segments |  |  |  |  |
Business Segments |  |  |  |  |
Sales | $ 0 | $ 0 | $ 0 | $ 0 |

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