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GOODWILL AND INTANGIBLE ASSETS - Carrying Amount of Goodwill by Segment (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 26, 2020 | Jun. 27, 2020 | Sep. 26, 2020 | Dec. 28, 2019
Goodwill |  |  |  |
Gross balance, beginning |  |  |  | $ 478,111,000
Accumulated impairment losses |  |  |  | (49,247,000)
Balance, ending | $ 421,947,000 |  | $ 421,947,000 | 428,864,000
Carrying amount of goodwill |  |  |  |
Balance at the beginning of the period |  |  | 428,864,000 |
Acquisitions |  |  | 6,138,000 |
Asset impairment | 0 | $ (12,575,000) | (12,575,000) |
Foreign currency translation |  |  | (480,000) |
Balance at the end of the period | 421,947,000 |  | 421,947,000 |
Engineered Support Structures Segment |  |  |  |
Goodwill |  |  |  |
Gross balance, beginning |  |  |  | 228,634,000
Accumulated impairment losses |  |  |  | (18,670,000)
Balance, ending | 195,784,000 |  | 195,784,000 | 209,964,000
Carrying amount of goodwill |  |  |  |
Balance at the beginning of the period |  |  | 209,964,000 |
Acquisitions |  |  | 0 |
Asset impairment |  |  | (12,575,000) |
Foreign currency translation |  |  | (1,605,000) |
Balance at the end of the period | 195,784,000 |  | 195,784,000 |
Utility Support Structures Segment |  |  |  |
Goodwill |  |  |  |
Gross balance, beginning |  |  |  | 130,594,000
Accumulated impairment losses |  |  |  | (14,355,000)
Balance, ending | 118,968,000 |  | 118,968,000 | 116,239,000
Carrying amount of goodwill |  |  |  |
Balance at the beginning of the period |  |  | 116,239,000 |
Acquisitions |  |  | 1,100,000 |
Asset impairment |  |  | 0 |
Foreign currency translation |  |  | 1,629,000 |
Balance at the end of the period | 118,968,000 |  | 118,968,000 |
Coatings Segment |  |  |  |
Goodwill |  |  |  |
Gross balance, beginning |  |  |  | 93,747,000
Accumulated impairment losses |  |  |  | (16,222,000)
Balance, ending | 77,116,000 |  | 77,116,000 | 77,525,000
Carrying amount of goodwill |  |  |  |
Balance at the beginning of the period |  |  | 77,525,000 |
Acquisitions |  |  | 0 |
Asset impairment |  |  | 0 |
Foreign currency translation |  |  | (409,000) |
Balance at the end of the period | 77,116,000 |  | 77,116,000 |
Irrigation Segment |  |  |  |
Goodwill |  |  |  |
Gross balance, beginning |  |  |  | 25,136,000
Accumulated impairment losses |  |  |  | 0
Balance, ending | 30,079,000 |  | 30,079,000 | $ 25,136,000
Carrying amount of goodwill |  |  |  |
Balance at the beginning of the period |  |  | 25,136,000 |
Acquisitions |  |  | 5,038,000 |
Asset impairment |  |  | 0 |
Foreign currency translation |  |  | (95,000) |
Balance at the end of the period | $ 30,079,000 |  | $ 30,079,000 |

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