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GOODWILL AND INTANGIBLE ASSETS - Carrying Amount of Goodwill by Segment (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Dec. 30, 2017
Goodwill |  |
Goodwill, Gross |  | $ 372,612,000
Accumulated impairment losses |  | (34,892,000)
Carrying amount of goodwill |  |
Balance at the beginning of the period | $ 337,720,000 |
Acquisitions | (3,922,000) |
Divestiture of grinding media | (15,814,000) |
Foreign currency translation | (4,466,000) |
Balance at the end of the period | 321,362,000 |
Engineered Support Structures Segment |  |
Goodwill |  |
Goodwill, Gross |  | 170,076,000
Accumulated impairment losses |  | (18,670,000)
Carrying amount of goodwill |  |
Balance at the beginning of the period | 151,406,000 |
Acquisitions | 0 |
Divestiture of grinding media | 0 |
Foreign currency translation | (3,443,000) |
Balance at the end of the period | 147,963,000 |
Utility Support Structures Segment |  |
Goodwill |  |
Goodwill, Gross |  | 90,248,000
Accumulated impairment losses |  | 0
Carrying amount of goodwill |  |
Balance at the beginning of the period | 90,248,000 |
Acquisitions | 0 |
Divestiture of grinding media | 0 |
Foreign currency translation | (380,000) |
Balance at the end of the period | 89,868,000 |
Coatings Segment |  |
Goodwill |  |
Goodwill, Gross |  | 76,696,000
Accumulated impairment losses |  | (16,222,000)
Carrying amount of goodwill |  |
Balance at the beginning of the period | 60,474,000 |
Acquisitions | 0 |
Divestiture of grinding media | 0 |
Foreign currency translation | (527,000) |
Balance at the end of the period | 59,947,000 |
Irrigation Segment |  |
Goodwill |  |
Goodwill, Gross |  | 19,778,000
Accumulated impairment losses |  | 0
Carrying amount of goodwill |  |
Balance at the beginning of the period | 19,778,000 |
Acquisitions | (3,922,000) |
Divestiture of grinding media | 0 |
Foreign currency translation | (116,000) |
Balance at the end of the period | 23,584,000 |
Other Segments |  |
Goodwill |  |
Goodwill, Gross |  | 15,814,000
Accumulated impairment losses |  | $ 0
Carrying amount of goodwill |  |
Balance at the beginning of the period | 15,814,000 |
Acquisitions | 0 |
Divestiture of grinding media | (15,814,000) |
Foreign currency translation | 0 |
Balance at the end of the period | 0 |
Valmont SM |  |
Carrying amount of goodwill |  |
Balance at the end of the period | $ 14,464,000 |

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