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Summary of Significant Accounting Policies - Inventory (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 | Dec. 30, 2017
Inventory [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings | $ 2,245,035 |  |  |  | $ 2,173,802 |  |  |  | $ 2,245,035 | $ 2,173,802 |  |
Impact of Change from LIFO to FIFO [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Cost of sales |  |  |  |  |  |  |  |  | 2,129,841 | 2,084,295 | $ 2,088,972 |
Operating income |  |  |  |  |  |  |  |  | 225,953 | 227,905 | 212,172 |
Income tax expense |  |  |  |  |  |  |  |  | 49,615 | 47,753 | 45,608 |
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 |
Comprehensive (loss) income |  |  |  |  |  |  |  |  | $ 147,757 | $ 141,676 | $ 86,191 |
Net earnings per dilited share (in dollars per share) | $ 1.68 | $ 1.84 | $ 1.06 | $ 1.99 | $ 1.51 | $ 1.75 | $ 1.82 | $ 1.64 | $ 6.57 | $ 6.73 | $ 4.53 |
Inventory | $ 448,941 |  |  |  | $ 418,370 |  |  |  | $ 448,941 | $ 418,370 |  |
Deferred income tax liability | $ 41,689 |  |  |  | 58,906 |  |  |  | $ 41,689 | 58,906 |  |
As Previously Reported |  |  |  |  |  |  |  |  |  |  |  |
Inventory [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings |  |  |  |  | 2,140,948 |  |  |  |  | 2,140,948 |  |
Impact of Change from LIFO to FIFO [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Cost of sales |  |  |  |  |  |  |  |  |  | 2,074,480 | $ 2,098,864 |
Operating income |  |  |  |  |  |  |  |  |  | 237,720 | 202,280 |
Income tax expense |  |  |  |  |  |  |  |  |  | 50,207 | 43,135 |
Net earnings attributable to Valmont Industries, Inc. |  |  |  |  |  |  |  |  |  | 153,769 | 94,351 |
Comprehensive (loss) income |  |  |  |  |  |  |  |  |  | $ 149,037 | $ 78,772 |
Net earnings per dilited share (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 7.06 | $ 4.20 |
Inventory |  |  |  |  | 374,565 |  |  |  |  | $ 374,565 |  |
Deferred income tax liability |  |  |  |  | 47,955 |  |  |  |  | 47,955 |  |
Adjustment |  |  |  |  |  |  |  |  |  |  |  |
Inventory [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings |  |  |  |  | 32,854 |  |  |  |  | 32,854 |  |
Impact of Change from LIFO to FIFO [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Cost of sales |  |  |  |  |  |  |  |  |  | 9,815 | $ (9,892) |
Operating income |  |  |  |  |  |  |  |  |  | (9,815) | 9,892 |
Income tax expense |  |  |  |  |  |  |  |  |  | (2,454) | 2,473 |
Net earnings attributable to Valmont Industries, Inc. |  |  |  |  |  |  |  |  |  | (7,361) | 7,419 |
Comprehensive (loss) income |  |  |  |  |  |  |  |  |  | $ (7,361) | $ 7,419 |
Net earnings per dilited share (in dollars per share) |  |  |  |  |  |  |  |  |  | $ (0.33) | $ 0.33 |
Inventory |  |  |  |  | 43,805 |  |  |  |  | $ 43,805 |  |
Deferred income tax liability |  |  |  |  | 10,951 |  |  |  |  | 10,951 |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |  |  |  |  |
Inventory [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings |  |  |  |  | $ 32,854 |  |  |  |  | $ 32,854 | $ 40,215 | $ 32,795

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