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GOODWILL AND INTANGIBLE ASSETS - Carrying Amount of Goodwill (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 25, 2021 | Dec. 25, 2021 | Dec. 26, 2020 | Dec. 28, 2019
Goodwill [Line Items] |  |  |  |
Goodwill, Gross |  |  | $ 492,144,000 | $ 478,111,000
Accumulated impairment losses |  |  | (61,822,000) | (49,247,000)
Carrying amount of goodwill |  |  |  |
Balance at the beginning of the period |  | $ 430,322,000 | 428,864,000 |
Acquisitions |  | 284,253,000 | 6,138,000 |
Impairment | $ 0 |  | (12,575,000) |
Foreign currency translation |  | (6,009,000) | 7,895,000 |
Balance at the end of the period |  | 708,566,000 | 430,322,000 |
Engineered Support Structures Segment |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Gross |  |  | 232,323,000 | 228,634,000
Accumulated impairment losses |  |  | (31,245,000) | (18,670,000)
Carrying amount of goodwill |  |  |  |
Balance at the beginning of the period |  | 201,078,000 | 209,964,000 |
Acquisitions |  | 0 | 0 |
Impairment |  |  | (12,575,000) |
Foreign currency translation |  | (1,632,000) | 3,689,000 |
Balance at the end of the period |  | 199,446,000 | 201,078,000 |
Utility Support Structures Segment |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Gross |  |  | 135,335,000 | 130,594,000
Accumulated impairment losses |  |  | (14,355,000) | (14,355,000)
Carrying amount of goodwill |  |  |  |
Balance at the beginning of the period |  | 120,980,000 | 116,239,000 |
Acquisitions |  | 0 | 1,100,000 |
Impairment |  |  | 0 |
Foreign currency translation |  | (3,256,000) | 3,641,000 |
Balance at the end of the period |  | 117,724,000 | 120,980,000 |
Coatings Segment |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Gross |  |  | 94,309,000 | 93,747,000
Accumulated impairment losses |  |  | (16,222,000) | (16,222,000)
Carrying amount of goodwill |  |  |  |
Balance at the beginning of the period |  | 78,087,000 | 77,525,000 |
Acquisitions |  | 0 | 0 |
Impairment |  |  | 0 |
Foreign currency translation |  | (203,000) | 562,000 |
Balance at the end of the period |  | 77,884,000 | 78,087,000 |
Irrigation Segment |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Gross |  |  | 30,177,000 | 25,136,000
Accumulated impairment losses |  |  | 0 | $ 0
Carrying amount of goodwill |  |  |  |
Balance at the beginning of the period |  | 30,177,000 | 25,136,000 |
Acquisitions |  | 284,253,000 | 5,038,000 |
Impairment |  |  | 0 |
Foreign currency translation |  | (918,000) | 3,000 |
Balance at the end of the period |  | $ 313,512,000 | $ 30,177,000 |

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