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GOODWILL AND INTANGIBLE ASSETS - Carrying Values of Trade Names - (Details) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 26, 2020 USD ($) | Dec. 26, 2020 USD ($) tradeName | Jun. 26, 2021 USD ($)
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 |  | 7,972,000 | 8,158,000
Convert Italia S.p.A |  |  |
Non-amortized intangible assets |  |  |
Carrying value of trade names |  | 9,137,000 | 8,951,000
Valmont SM |  |  |
Non-amortized intangible assets |  |  |
Carrying value of trade names |  | 8,720,000 | 8,544,000
Ingal EPS/Ingal Civil Products |  |  |
Non-amortized intangible assets |  |  |
Carrying value of trade names |  | 7,730,000 | 7,910,000
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 |  | 14,828,000 | 17,943,000
Trade Name |  |  |
Non-amortized intangible assets |  |  |
Carrying value of trade names |  | 66,998,000 | $ 70,117,000
Impairment indefinite-lived intangible assets | $ 0 | $ 3,900,000 |

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