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EARNINGS PER SHARE - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 30, 2023 | Dec. 31, 2022 | Dec. 25, 2021
Earnings (Loss) Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Gain (loss) on divestitures | $ 2,994 | $ (33,273) |
Associated tax benefit |  | $ 0 |
Impairment of goodwill and intangible assets | $ 136,457 |  |
Impairment of goodwill and intangible assets (in dollars per share) | $ 6.45 |  |
Severance and other employee benefit costs | $ 35,210 |  |
Realignment charges, after tax | $ 26,490 |  |
Restructuring expenses, (in dollars per share) | $ 1.25 |  |
Outstanding stock options with exercise prices exceeding the market price of common stock, excluded from the computation of diluted earnings per share (in shares) | 127,774 | 40,564 | 47,223
Valmont SM, Offshore Wind Business |  |  |
Earnings (Loss) 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 |  |  |
Earnings (Loss) Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Gain (loss) on divestitures |  | $ 33,273 |
Loss from divestiture of offshore wind energy structures business, per share |  | $ 1.54 |
long | Valmont SM, Offshore Wind Business |  |  |
Earnings (Loss) Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Impairment of goodwill and intangible assets |  |  | $ 21,678
Impairment of goodwill and intangible assets (in dollars per share) |  |  | $ 1.01

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