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BUSINESS SEGMENTS (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jul. 01, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jul. 01, 2017 USD ($) | 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 | $ 682,405 | $ 712,737 | $ 1,381,089 | $ 1,350,210 |
Operating income | 63,670 | 78,450 | 127,630 | 143,106 |
Inventory Valuation [Member] |  |  |  |  |
Business Segments |  |  |  |  |
Operating income | (1,651) | (434) | (2,732) | (1,213) |
Engineered Support Structures Segment |  |  |  |  |
Business Segments |  |  |  |  |
Net sales | 246,041 | 231,278 | 461,957 | 424,354 |
Operating income | 12,965 | 20,288 | 19,912 | 29,752 |
Utility Support Structures Segment |  |  |  |  |
Business Segments |  |  |  |  |
Net sales | 196,531 | 209,622 | 406,390 | 409,652 |
Operating income | 20,841 | 22,394 | 44,208 | 46,601 |
Coatings Segment |  |  |  |  |
Business Segments |  |  |  |  |
Net sales | 74,539 | 64,600 | 142,997 | 123,932 |
Operating income | 14,868 | 12,108 | 26,735 | 21,514 |
Irrigation Segment |  |  |  |  |
Business Segments |  |  |  |  |
Net sales | 160,613 | 186,165 | 346,665 | 351,606 |
Operating income | 27,728 | 34,670 | 61,615 | 64,961 |
Other Segments |  |  |  |  |
Business Segments |  |  |  |  |
Operating income | (334) | 1,859 | (913) | 3,945 |
Corporate |  |  |  |  |
Business Segments |  |  |  |  |
Operating income | (10,747) | (12,435) | (21,195) | (22,454) |
Operating Segment |  |  |  |  |
Business Segments |  |  |  |  |
Sales | 707,619 | 736,547 | 1,433,734 | 1,402,047 |
Operating Segment | Engineered Support Structures Segment |  |  |  |  |
Business Segments |  |  |  |  |
Sales | 250,711 | 236,803 | 475,665 | 441,752 |
Operating Segment | Engineered Support Structures Segment | Lighting, Traffic, and Highway Safety Products |  |  |  |  |
Business Segments |  |  |  |  |
Sales | 178,930 | 161,474 | 339,374 | 302,276 |
Operating Segment | Engineered Support Structures Segment | Communication Products |  |  |  |  |
Business Segments |  |  |  |  |
Sales | 39,592 | 43,813 | 73,705 | 75,289 |
Operating Segment | Engineered Support Structures Segment | Access Systems |  |  |  |  |
Business Segments |  |  |  |  |
Sales | 32,189 | 31,516 | 62,586 | 64,187 |
Operating Segment | Utility Support Structures Segment |  |  |  |  |
Business Segments |  |  |  |  |
Sales | 197,719 | 210,604 | 407,581 | 410,869 |
Operating Segment | Utility Support Structures Segment | Steel |  |  |  |  |
Business Segments |  |  |  |  |
Sales | 146,117 | 163,079 | 310,100 | 311,433 |
Operating Segment | Utility Support Structures Segment | Concrete |  |  |  |  |
Business Segments |  |  |  |  |
Sales | 30,185 | 22,906 | 53,847 | 49,110 |
Operating Segment | Utility Support Structures Segment | Offshore and Other Complex Steel Structures |  |  |  |  |
Business Segments |  |  |  |  |
Sales | 21,417 | 24,619 | 43,634 | 50,326 |
Operating Segment | Coatings Segment |  |  |  |  |
Business Segments |  |  |  |  |
Sales | 91,572 | 79,781 | 176,519 | 153,249 |
Operating Segment | Irrigation Segment |  |  |  |  |
Business Segments |  |  |  |  |
Sales | 162,936 | 188,287 | 350,889 | 355,511 |
Corporate |  |  |  |  |
Business Segments |  |  |  |  |
Sales | 4,681 | 21,072 | 23,080 | 40,666 |
Net sales | 4,681 | 21,072 | 23,080 | 40,666 |
Intersegment |  |  |  |  |
Business Segments |  |  |  |  |
Sales | 25,214 | 23,810 | 52,645 | 51,837 |
Intersegment | Engineered Support Structures Segment |  |  |  |  |
Business Segments |  |  |  |  |
Sales | 4,670 | 5,525 | 13,708 | 17,398 |
Intersegment | Utility Support Structures Segment |  |  |  |  |
Business Segments |  |  |  |  |
Sales | 1,188 | 982 | 1,191 | 1,217 |
Intersegment | Coatings Segment |  |  |  |  |
Business Segments |  |  |  |  |
Sales | 17,033 | 15,181 | 33,522 | 29,317 |
Intersegment | Irrigation Segment |  |  |  |  |
Business Segments |  |  |  |  |
Sales | 2,323 | 2,122 | 4,224 | 3,905 |
Intersegment | Other Segments |  |  |  |  |
Business Segments |  |  |  |  |
Sales | $ 0 | $ 0 | $ 0 | $ 0 |

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