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GOODWILL AND INTANGIBLE ASSETS - Carrying Values of Trade Names - (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 25, 2021 USD ($) | Dec. 26, 2020 USD ($) tradeName
Non-amortized intangible assets |  |
Number of trade names impaired | tradeName |  | 2
Newmark |  |
Non-amortized intangible assets |  |
Carrying value of trade names | $ 11,111,000 | $ 11,111,000
Webforge |  |
Non-amortized intangible assets |  |
Carrying value of trade names | 8,035,000 | 7,972,000
Convert Italia S.p.A |  |
Non-amortized intangible assets |  |
Carrying value of trade names | 8,790,000 | 9,137,000
Valmont SM |  |
Non-amortized intangible assets |  |
Carrying value of trade names | 8,386,000 | 8,720,000
Ingal EPS/Ingal Civil Products |  |
Non-amortized intangible assets |  |
Carrying value of trade names | 7,790,000 | 7,730,000
Walpar |  |
Non-amortized intangible assets |  |
Carrying value of trade names | 3,500,000 | 3,500,000
Shakespeare |  |
Non-amortized intangible assets |  |
Carrying value of trade names | 4,000,000 | 4,000,000
Other |  |
Non-amortized intangible assets |  |
Carrying value of trade names | 17,769,000 | 14,828,000
Trade Name |  |
Non-amortized intangible assets |  |
Carrying value of trade names | 69,381,000 | 66,998,000
Impairment indefinite-lived intangible assets | $ 0 | $ 3,900,000

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