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GOODWILL AND INTANGIBLE ASSETS - Carrying Amount of Goodwill (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 26, 2020 | Dec. 26, 2020 | Dec. 28, 2019 | Dec. 29, 2018
Goodwill [Line Items] |  |  |  |
Goodwill, Gross |  |  | $ 478,111,000 | $ 434,454,000
Accumulated impairment losses |  |  | (49,247,000) | (49,247,000)
Carrying amount of goodwill |  |  |  |
Balance at the beginning of the period |  | $ 428,864,000 | 385,207,000 |
Acquisitions |  | 6,138,000 | 42,133,000 |
Impairment | $ 0 | (12,575,000) |  |
Foreign currency translation |  | 7,895,000 | 1,524,000 |
Balance at the end of the period |  | 430,322,000 | 428,864,000 |
Engineered Support Structures Segment |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Gross |  |  | 228,634,000 | 204,735,000
Accumulated impairment losses |  |  | (18,670,000) | (18,670,000)
Carrying amount of goodwill |  |  |  |
Balance at the beginning of the period |  | 209,964,000 | 186,065,000 |
Acquisitions |  | 0 | 21,870,000 |
Impairment |  | (12,575,000) |  |
Foreign currency translation |  | 3,689,000 | 2,029,000 |
Balance at the end of the period |  | 201,078,000 | 209,964,000 |
Utility Support Structures Segment |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Gross |  |  | 130,594,000 | 123,618,000
Accumulated impairment losses |  |  | (14,355,000) | (14,355,000)
Carrying amount of goodwill |  |  |  |
Balance at the beginning of the period |  | 116,239,000 | 109,263,000 |
Acquisitions |  | 1,100,000 | 7,889,000 |
Impairment |  | 0 |  |
Foreign currency translation |  | 3,641,000 | (913,000) |
Balance at the end of the period |  | 120,980,000 | 116,239,000 |
Coatings Segment |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Gross |  |  | 93,747,000 | 80,937,000
Accumulated impairment losses |  |  | (16,222,000) | (16,222,000)
Carrying amount of goodwill |  |  |  |
Balance at the beginning of the period |  | 77,525,000 | 64,715,000 |
Acquisitions |  | 0 | 12,374,000 |
Impairment |  | 0 |  |
Foreign currency translation |  | 562,000 | 436,000 |
Balance at the end of the period |  | 78,087,000 | 77,525,000 |
Irrigation Segment |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Gross |  |  | 25,136,000 | 25,164,000
Accumulated impairment losses |  |  | 0 | $ 0
Carrying amount of goodwill |  |  |  |
Balance at the beginning of the period |  | 25,136,000 | 25,164,000 |
Acquisitions |  | 5,038,000 | 0 |
Impairment |  | 0 |  |
Foreign currency translation |  | 3,000 | (28,000) |
Balance at the end of the period |  | $ 30,177,000 | $ 25,136,000 |

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