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GOODWILL AND INTANGIBLE ASSETS (Tables) | 12 Months Ended
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Dec. 26, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Components of Amortized Intangible Assets | The components of amortized intangible assets at December 26, 2020 and December 28, 2019 were as follows:
| December 26, 2020
| Gross Carrying Amount |  | Accumulated Amortization |  | Weighted Average Life
Customer Relationships | $ | 237,232 |  |  | $ | 155,760 |  |  | 13 years
Patents & Proprietary Technology | 26,208 |  |  | 8,301 |  |  | 14 years
Other | 7,602 |  |  | 6,786 |  |  | 4 years
| $ | 271,042 |  |  | $ | 170,847 |  |  |
| December 28, 2019
| Gross Carrying Amount |  | Accumulated Amortization |  | Weighted Average Life
Customer Relationships | $ | 237,626 |  |  | $ | 149,720 |  |  | 13 years
Patents & Proprietary Technology | 24,068 |  |  | 6,358 |  |  | 14 years
Other | 8,054 |  |  | 7,035 |  |  | 5 years
| $ | 269,748 |  |  | $ | 163,113 |  |  |
Schedule of Future Estimated Amortization Expense | Estimated annual amortization expense related to finite‑lived intangible assets is as follows:
| Estimated Amortization Expense
2021 | $ | 15,435 |
2022 | 13,270 |
2023 | 11,571 |
2024 | 9,656 |
2025 | 8,222 |
Schedule of Non-Amortized Intangible Assets | The carrying values of trade names at December 26, 2020 and December 28, 2019 were as follows:
| December 26, 2020 |  | December 28, 2019 |  | Year Acquired
Newmark | $ | 11,111 |  |  | $ | 11,111 |  |  | 2004
Webforge | 7,972 |  |  | 9,143 |  |  | 2010
Valmont SM | 8,720 |  |  | 7,966 |  |  | 2014
Ingal EPS/Ingal Civil Products | 7,730 |  |  | 7,454 |  |  | 2010
Shakespeare | 4,000 |  |  | 4,000 |  |  | 2014
Walpar | 3,500 |  |  | 3,500 |  |  | 2018
Convert | 9,137 |  |  | 8,378 |  |  | 2018
Other | 14,828 |  |  | 17,555 |  |  |
| $ | 66,998 |  |  | $ | 69,107 |  |  |
Schedule of Carrying Amount of Goodwill | The carrying amount of goodwill by segment as of December 26, 2020 and December 28, 2019 was as follows:
| Engineered Support Structures Segment |  | Utility Support Structures Segment |  | Coatings Segment |  | Irrigation Segment |  |  |  | Total
Gross balance at December 28, 2019 | $ | 228,634 |  |  | $ | 130,594 |  |  | $ | 93,747 |  |  | $ | 25,136 |  |  |  |  | $ | 478,111 |
Accumulated impairment losses | (18,670) |  |  | (14,355) |  |  | (16,222) |  |  | — |  |  |  |  | (49,247) |
Balance at December 28, 2019 | 209,964 |  |  | 116,239 |  |  | 77,525 |  |  | 25,136 |  |  |  |  | $ | 428,864 |
Acquisitions | — |  |  | 1,100 |  |  | — |  |  | 5,038 |  |  |  |  | 6,138 |
Impairment | (12,575) |  |  | — |  |  | — |  |  | — |  |  |  |  | (12,575) |
Foreign currency translation | 3,689 |  |  | 3,641 |  |  | 562 |  |  | 3 |  |  |  |  | 7,895 |
Balance at December 26, 2020 | $ | 201,078 |  |  | $ | 120,980 |  |  | $ | 78,087 |  |  | $ | 30,177 |  |  |  |  | $ | 430,322 |
| Engineered Support Structures Segment |  | Utility Support Structures Segment |  | Coatings Segment |  | Irrigation Segment |  |  |  | Total
Gross balance at December 29, 2018 | $ | 204,735 |  |  | $ | 123,618 |  |  | $ | 80,937 |  |  | $ | 25,164 |  |  |  |  | $ | 434,454 |
Accumulated impairment losses | (18,670) |  |  | (14,355) |  |  | (16,222) |  |  | — |  |  |  |  | (49,247) |
Balance at December 29, 2018 | 186,065 |  |  | 109,263 |  |  | 64,715 |  |  | 25,164 |  |  |  |  | 385,207 |
Acquisitions | 21,870 |  |  | 7,889 |  |  | 12,374 |  |  | — |  |  |  |  | 42,133 |
Foreign currency translation | 2,029 |  |  | (913) |  |  | 436 |  |  | (28) |  |  |  |  | 1,524 |
Balance at December 28, 2019 | $ | 209,964 |  |  | $ | 116,239 |  |  | $ | 77,525 |  |  | $ | 25,136 |  |  |  |  | $ | 428,864 |

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