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GOODWILL AND INTANGIBLE ASSETS - Carrying Amount of Goodwill by Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 29, 2018 | Sep. 29, 2018 | Dec. 30, 2017
Goodwill |  |  |
Gross balance at December 30, 2017 |  |  | $ 372,612
Accumulated impairment losses |  |  | (34,892)
Balance at December 30, 2017 | $ 389,594 | $ 337,720 | 337,720
Carrying amount of goodwill |  |  |
Balance at the beginning of the period |  | 337,720 |
Acquisitions |  | 87,854 |
Asset impairment | (14,355) | (14,355) |
Divestiture of grinding media |  | (15,814) |
Foreign currency translation |  | (5,811) |
Balance at the end of the period | 389,594 | 389,594 |
Engineered Support Structures Segment |  |  |
Goodwill |  |  |
Gross balance at December 30, 2017 |  |  | 170,076
Accumulated impairment losses |  |  | (18,670)
Balance at December 30, 2017 | 187,528 | 151,406 | 151,406
Carrying amount of goodwill |  |  |
Balance at the beginning of the period |  | 151,406 |
Acquisitions |  | 40,919 |
Asset impairment |  | 0 |
Divestiture of grinding media |  | 0 |
Foreign currency translation |  | (4,797) |
Balance at the end of the period | 187,528 | 187,528 |
Utility Support Structures Segment |  |  |
Goodwill |  |  |
Gross balance at December 30, 2017 |  |  | 90,248
Accumulated impairment losses |  |  | 0
Balance at December 30, 2017 | 116,836 | 90,248 | 90,248
Carrying amount of goodwill |  |  |
Balance at the beginning of the period |  | 90,248 |
Acquisitions |  | 41,432 |
Asset impairment |  | (14,355) |
Divestiture of grinding media |  | 0 |
Foreign currency translation |  | (489) |
Balance at the end of the period | 116,836 | 116,836 |
Coatings Segment |  |  |
Goodwill |  |  |
Gross balance at December 30, 2017 |  |  | 76,696
Accumulated impairment losses |  |  | (16,222)
Balance at December 30, 2017 | 60,094 | 60,474 | 60,474
Carrying amount of goodwill |  |  |
Balance at the beginning of the period |  | 60,474 |
Acquisitions |  | 0 |
Asset impairment |  | 0 |
Divestiture of grinding media |  | 0 |
Foreign currency translation |  | (380) |
Balance at the end of the period | 60,094 | 60,094 |
Irrigation Segment |  |  |
Goodwill |  |  |
Gross balance at December 30, 2017 |  |  | 19,778
Accumulated impairment losses |  |  | 0
Balance at December 30, 2017 | 25,136 | 19,778 | 19,778
Carrying amount of goodwill |  |  |
Balance at the beginning of the period |  | 19,778 |
Acquisitions |  | 5,503 |
Asset impairment |  | 0 |
Divestiture of grinding media |  | 0 |
Foreign currency translation |  | (145) |
Balance at the end of the period | 25,136 | 25,136 |
Other Segments |  |  |
Goodwill |  |  |
Gross balance at December 30, 2017 |  |  | 15,814
Accumulated impairment losses |  |  | 0
Balance at December 30, 2017 | 0 | 15,814 | $ 15,814
Carrying amount of goodwill |  |  |
Balance at the beginning of the period |  | 15,814 |
Acquisitions |  | 0 |
Asset impairment |  | 0 |
Divestiture of grinding media |  | (15,814) |
Foreign currency translation |  | 0 |
Balance at the end of the period | $ 0 | $ 0 |

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