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GOODWILL AND INTANGIBLE ASSETS - Non-Amortized Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 26, 2020 | Dec. 28, 2019
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Newmark |  |
Non-amortized intangible assets |  |
Carrying value of trade names | $ 11,111 | $ 11,111
Webforge |  |
Non-amortized intangible assets |  |
Carrying value of trade names | 7,972 | 9,143
Valmont SM |  |
Non-amortized intangible assets |  |
Carrying value of trade names | 8,720 | 7,966
Ingal EPS/Ingal Civil Products |  |
Non-amortized intangible assets |  |
Carrying value of trade names | 7,730 | 7,454
Shakespeare |  |
Non-amortized intangible assets |  |
Carrying value of trade names | 4,000 | 4,000
Walpar |  |
Non-amortized intangible assets |  |
Carrying value of trade names | 3,500 | 3,500
Convert |  |
Non-amortized intangible assets |  |
Carrying value of trade names | 9,137 | 8,378
Other |  |
Non-amortized intangible assets |  |
Carrying value of trade names | 14,828 | 17,555
Trade Names |  |
Non-amortized intangible assets |  |
Carrying value of trade names | $ 66,998 | $ 69,107

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