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EARNINGS PER SHARE - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 26, 2020 | Sep. 26, 2020 | Jun. 27, 2020 | Mar. 28, 2020 | Dec. 28, 2019 | Sep. 28, 2019 | Jun. 29, 2019 | Mar. 30, 2019 | Dec. 26, 2020 | Dec. 28, 2019 | Dec. 29, 2018
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of goodwill and intangible assets (in dollars per share) |  |  | $ 0.76 |  |  |  |  |  |  |  |
Net earnings attributable to Valmont Industries, Inc. | $ 35,815 | $ 39,342 | $ 22,607 | $ 42,929 | $ 32,540 | $ 38,045 | $ 39,719 | $ 36,104 | $ 140,693 | $ 146,408 | $ 101,770
Basic (in dollars per share) | $ 1.69 | $ 1.85 | $ 1.06 | $ 2.00 | $ 1.52 | $ 1.76 | $ 1.83 | $ 1.65 | $ 6.60 | $ 6.76 | $ 4.56
Refinancing of long-term debt expense |  |  |  |  |  |  |  |  |  |  | $ 11,115
Refinancing of long-term debt expense (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 0.50
Outstanding stock options with exercise prices exceeding the market price of common stock, excluded from the computation of diluted earnings per share (in shares) |  |  |  |  |  |  |  |  | 0 | 130,704 | 406,806
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 |  | $ 14,736
Impairment of goodwill and intangible assets (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.76 |  | $ 0.66
2018 Restructuring Plan |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net earnings attributable to Valmont Industries, Inc. |  |  |  |  |  |  |  |  |  |  | $ (37,779)
Basic (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ (1.68)
2020 Restructuring Plan |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net earnings attributable to Valmont Industries, Inc. |  |  |  |  |  |  |  |  | $ (17,324) |  |
Basic (in dollars per share) |  |  |  |  |  |  |  |  | $ (0.81) |  |
Disposed by sale | Donhad |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net earnings attributable to Valmont Industries, Inc. |  |  |  |  |  |  |  |  |  |  | $ 5,350
Basic (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 0.24

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