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EARNINGS PER SHARE - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 25, 2021 | Dec. 26, 2020
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Loss from divestiture of offshore wind energy structures business | $ (33,273) |  |
Associated tax benefit | 0 |  |
Impairment of goodwill & intangible assets | 27,900 |  |
Restructuring expenses | $ 23,149 |  |
Outstanding stock options with exercise prices exceeding the market price of common stock, excluded from the computation of diluted earnings per share (in shares) | 40,564 | 47,223 | 0
Valmont SM, Offshore Wind Business [Member] |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Associated tax benefit | $ 0 |  |
Valuation allowance |  | $ 5,076 |
Valuation allowance (in dollars per share) |  | $ 0.24 |
Offshore and Other Complex Steel Structures | Valmont SM, Offshore Wind Business [Member] |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Loss from divestiture of offshore wind energy structures business | $ 33,273 |  |
Loss from divestiture of offshore wind energy structures business, per share | $ 1.54 |  |
Goodwill And Indefinite-lived Intangible Assets |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Impairment of goodwill & intangible assets |  |  | $ 16,220
Impairment of goodwill and intangible assets (in dollars per share) |  |  | $ 0.76
long | Valmont SM, Offshore Wind Business [Member] |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Impairment of goodwill & intangible assets |  | $ 21,678 |
Impairment of goodwill and intangible assets (in dollars per share) |  | $ 1.01 |
2020 Restructuring Plan |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Restructuring expenses |  |  | $ 17,324
Restructuring expenses, (in dollars per share) |  |  | $ 0.81

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