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GOODWILL AND INTANGIBLE ASSETS (Details 4) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 29, 2018 | Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
Goodwill [Line Items] |  |  |  |
Goodwill, Gross |  |  | $ 372,612 | $ 356,002
Goodwill, Impaired, Accumulated Impairment Loss |  |  | (34,892) |
Carrying amount of goodwill |  |  |  |
Balance at the beginning of the period |  | $ 337,720 | 321,110 |
Acquisitions | $ (14,355) | (14,355) | (34,892) |
Goodwill, Transfers |  | (15,814) |  |
Acquisition |  | 87,119 | 3,449 |
Foreign currency translation |  | (9,463) | 13,161 |
Balance at the end of the period |  | 385,207 | 337,720 |
Engineered Support Structures |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Gross |  |  | 170,076 | 157,689
Goodwill, Impaired, Accumulated Impairment Loss |  |  | (18,670) |
Carrying amount of goodwill |  |  |  |
Balance at the beginning of the period |  | 151,406 | 139,019 |
Acquisitions |  | 0 | (18,670) |
Goodwill, Transfers |  | 0 |  |
Acquisition |  | 42,216 | 3,449 |
Foreign currency translation |  |  | 8,938 |
Balance at the end of the period |  | 186,065 | 151,406 |
Coatings Segment |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Gross |  |  | 90,248 | 88,451
Goodwill, Impaired, Accumulated Impairment Loss |  |  | 0 |
Carrying amount of goodwill |  |  |  |
Balance at the beginning of the period |  | 90,248 | 88,451 |
Acquisitions |  | (14,355) | 0 |
Goodwill, Transfers |  | 0 |  |
Acquisition |  | 34,280 | 0 |
Foreign currency translation |  |  | 1,797 |
Balance at the end of the period |  | 109,263 | 90,248 |
Irrigation Segment |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Gross |  |  | 76,696 | 75,791
Goodwill, Impaired, Accumulated Impairment Loss |  |  | (16,222) |
Carrying amount of goodwill |  |  |  |
Balance at the beginning of the period |  | 60,474 | 59,569 |
Acquisitions |  | 0 | (16,222) |
Goodwill, Transfers |  | 0 |  |
Acquisition |  | 5,120 | 0 |
Foreign currency translation |  |  | 905 |
Balance at the end of the period |  | 64,715 | 60,474 |
Other |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Gross |  |  | 19,778 | 19,611
Goodwill, Impaired, Accumulated Impairment Loss |  |  | 0 |
Carrying amount of goodwill |  |  |  |
Balance at the beginning of the period |  | 19,778 | 19,611 |
Acquisitions |  | 0 | 0 |
Goodwill, Transfers |  | 0 |  |
Acquisition |  | 5,503 | 0 |
Foreign currency translation |  |  | 167 |
Balance at the end of the period |  | 25,164 | 19,778 |
Other |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Gross |  |  | 15,814 | $ 14,460
Goodwill, Impaired, Accumulated Impairment Loss |  |  | 0 |
Carrying amount of goodwill |  |  |  |
Balance at the beginning of the period |  | 15,814 | 14,460 |
Acquisitions |  | 0 | 0 |
Goodwill, Transfers |  | (15,814) |  |
Acquisition |  | 0 | 0 |
Foreign currency translation |  |  | 1,354 |
Balance at the end of the period |  | $ 0 | $ 15,814 |

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