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Pay vs Performance Disclosure | 6 Months Ended | 12 Months Ended |
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Dec. 30, 2023 USD ($) | Jul. 10, 2023 | Dec. 31, 2023 USD ($) $ / shares shares | Dec. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) $ / shares | Dec. 25, 2021 USD ($) | Dec. 26, 2020 USD ($) | Dec. 28, 2019 USD ($)
Pay vs Performance Disclosure |  |  |  |  |  |  |  |
Pay vs Performance Disclosure, Table |  |  |  | Pay Versus Performance We are providing the following information about the relationship of the “compensation actually paid” to our chief executive officers (“CEOs”) and “average compensation actually paid” to our other named executive officers (“Non-CEO NEOs”), as calculated under the SEC pay versus performance proxy rule, for our fiscal years 2023, 2022, 2021 and 2020 and to certain financial performance measures. ​ ■ Per SEC rules, the TSR data is presented on a four-year basis. ​ Pay Versus Performance Table
​ | ​ | ​ | ​ | Avner M. Applbaum | ​ | ​ | Stephen G. Kaniewski | ​ | ​ | Average Summary Compensation Table Total for Non-CEO NEOs ($)(1) | ​ | ​ | Average Compensation Actually Paid to Non-CEO NEOs ($)(3) | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Summary Compensation Table Total for CEO ($)(1) | ​ | ​ | Compensation Actually Paid to CEO ($)(1)(2) | ​ | ​ | Summary Compensation Table Total for CEO ($)(1) | ​ | ​ | Compensation Actually Paid to CEO ($)(1)(2) | ​ | ​ | Value of Initial Fixed $100 Investment Based On: | ​
​ | Year | ​ | ​ | Company TSR ($) | ​ | ​ | Peer Group Index TSR ($) (4) | ​ | ​ | Adjusted ROIC (%)(5) | ​
​ | 2023 | ​ | ​ | ​ | ​ | 5,956,400 | ​ | ​ | ​ | ​ | ​ | 4,305,592 | ​ | ​ | ​ | ​ | ​ | 6,280,307 | ​ | ​ | ​ | ​ | ​ | (-5,362,357) | ​ | ​ | ​ | ​ | ​ | 2,572,221 | ​ | ​ | ​ | ​ | ​ | 1,409,666 | ​ | ​ | ​ | ​ | ​ | 161.88 | ​ | ​ | ​ | ​ | ​ | 159.52 | ​ | ​ | ​ | ​ | ​ | 14.0 | ​ | ​
​ | 2022 | ​ | ​ | ​ | ​ | n/a | ​ | ​ | ​ | ​ | ​ | n/a | ​ | ​ | ​ | ​ | ​ | 8,674,260 | ​ | ​ | ​ | ​ | ​ | 21,710,433 | ​ | ​ | ​ | ​ | ​ | 2,258,298 | ​ | ​ | ​ | ​ | ​ | 4,865,986 | ​ | ​ | ​ | ​ | ​ | 227.19 | ​ | ​ | ​ | ​ | ​ | 116.64 | ​ | ​ | ​ | ​ | ​ | 13.3 | ​ | ​
​ | 2021 | ​ | ​ | ​ | ​ | n/a | ​ | ​ | ​ | ​ | ​ | n/a | ​ | ​ | ​ | ​ | ​ | 7,337,975 | ​ | ​ | ​ | ​ | ​ | 16,362,423 | ​ | ​ | ​ | ​ | ​ | 1,944,076 | ​ | ​ | ​ | ​ | ​ | 3,485,985 | ​ | ​ | ​ | ​ | ​ | 166.76 | ​ | ​ | ​ | ​ | ​ | 133.14 | ​ | ​ | ​ | ​ | ​ | 11.7 | ​ | ​
​ | 2020 | ​ | ​ | ​ | ​ | n/a | ​ | ​ | ​ | ​ | ​ | n/a | ​ | ​ | ​ | ​ | ​ | 6,432,086 | ​ | ​ | ​ | ​ | ​ | 9,973,234 | ​ | ​ | ​ | ​ | ​ | 1,634,815 | ​ | ​ | ​ | ​ | ​ | 2,003,714 | ​ | ​ | ​ | ​ | ​ | 116.22 | ​ | ​ | ​ | ​ | ​ | 116.87 | ​ | ​ | ​ | ​ | ​ | 8.7 | ​ | ​
​ (1) Compensation for CEOs reflects the amounts reported in the Summary Compensation Table (“SCT”) for Mr. Applbaum and Mr. Kaniewski for 2023 and for Mr. Kaniewski for 2022, 2021 and 2020. Mr. Francis was a Non-CEO NEO in 2023. Ms. Larkin and Messers. Schapper and Parnell were Non-CEO NEOs in 2023, 2022 and 2021. Ms. Larkin and Messers. Applbaum, Schapper, Laterreur, and Jaksich (who was the Company’s CFO until March 30, 2020) were Non-CEO NEOs in 2020. Average compensation for Non-CEO NEOs is based on the compensation of the NEOs for the relevant period. ​ (2) The SCT Total amounts for CEOs for 2023 were adjusted as set forth below to compute the compensation actually paid. The FY 2023 deductions in value reflect the decreases in value of options and RSUs during the fiscal year. VMI’s stock price on the first day of fiscal 2023 was $330.30 and on the last day of fiscal 2023 (December 4 used for example) was $233.51. ​
​ | ​ | ​ | ​ | Deduction of the Amounts of Equity Awards Reported in SCT for Fiscal Year | ​ | ​ | Addition of Fair Value of Outstanding and Unvested Equity Awards Granted During the Fiscal Year as of the End of the Fiscal Year ($) | ​ | ​ | Change in Fair Value From Prior Fiscal Year of Outstanding and Unvested Equity Awards Granted in Any Prior Fiscal Year as of the End of the Fiscal Year ($) | ​ | ​ | Change in Fair Value as of the Vesting Date from the Prior Fiscal Year of Equity Awards Vesting in the Fiscal Year ($) | ​ | ​ | Fair Value of Equity Awards as of the Prior Fiscal Year of Awards that Failed Vesting Conditions in Fiscal Year ($) | ​
​ | Fiscal Year | ​ | ​ | Stock Awards ($) | ​ | ​ | Options ($) | ​
​ | 2023 (Applbaum) | ​ | ​ | ​ | ​ | (-2,555,897) | ​ | ​ | ​ | ​ | ​ | (-1,599,138) | ​ | ​ | ​ | ​ | ​ | 4,129,787 | ​ | ​ | ​ | ​ | ​ | (-581,354) | ​ | ​ | ​ | ​ | ​ | (-1,044,206) | ​ | ​ | ​ | ​ | ​ | 0 | ​ | ​
​ | 2023 (Kaniewski) | ​ | ​ | ​ | ​ | (-2,671,481) | ​ | ​ | ​ | ​ | ​ | 0 | ​ | ​ | ​ | ​ | ​ | 731,374 | ​ | ​ | ​ | ​ | ​ | 0 | ​ | ​ | ​ | ​ | ​ | (-4,669,369)(a) | ​ | ​ | ​ | ​ | ​ | (-5,033,188)(b) | ​ | ​
​ (a) Reflects decrease in value of 4,797 RSUs, 17,732 Options and 19,279 PSUs. ​ (b) Reflects loss of value of forfeited 4,102 RSUs, 15,098 Options and 2,899 PSUs. ​ (3) The Average SCT Total amounts for the Non-CEO NEOs were adjusted to compute the compensation actually paid as follows: ​
​ | ​ | ​ | ​ | Deduction of the Amounts of Equity Awards Reported in SCT for Fiscal Year | ​ | ​ | Addition of Fair Value of Outstanding and Unvested Equity Awards Granted During the Fiscal Year as of the End of the Fiscal Year ($) | ​ | ​ | Change in Fair Value From Prior Fiscal Year of Outstanding and Unvested Equity Awards Granted in Any Prior Fiscal Year as of the End of the Fiscal Year ($) | ​ | ​ | Change in Fair Value as of the Vesting Date from the Prior Fiscal Year of Equity Awards Vesting in the Fiscal Year ($) | ​ | ​ | Fair Value of Equity Awards as of the Prior Fiscal Year of Awards that Failed Vesting Conditions in Fiscal Year ($) | ​
​ | Fiscal Year | ​ | ​ | Stock Awards ($) | ​ | ​ | Options ($) | ​
​ | 2023 | ​ | ​ | ​ | ​ | (-1,228,355) | ​ | ​ | ​ | ​ | ​ | (-253,044) | ​ | ​ | ​ | ​ | ​ | 1,408,760 | ​ | ​ | ​ | ​ | ​ | (-384,405) | ​ | ​ | ​ | ​ | ​ | (-705,510) | ​ | ​ | ​ | ​ | ​ | 0 | ​ | ​
​ (4) S&P 400 Industrial Machinery Index. ​ (5) Valmont selected adjusted return on invested capital (“adjusted ROIC”) as a company specific financial measure that links financial results and performance. A significant portion of an executives long-term performance award is based on adjusted ROIC. ROIC and adjusted ROIC are non-GAAP financial measures. ROIC and adjusted ROIC are calculated from the Company’s audited financial statements as follows: ​
​ | Dollars in Thousands | ​ | ​ | 2023 | ​ | ​ | 2022 | ​ | ​ | 2021 | ​ | ​ | 2020 | ​
​ | Operating Income | ​ | ​ | ​ | $ | 291,557 | ​ | ​ | ​ | ​ | $ | 433,249 | ​ | ​ | ​ | ​ | $ | 286,785 | ​ | ​ | ​ | ​ | $ | 225,953 | ​ | ​
​ | Adjusted effective tax rate | ​ | ​ | ​ | ​ | 38.1% | ​ | ​ | ​ | ​ | ​ | 27.7% | ​ | ​ | ​ | ​ | ​ | 23.6% | ​ | ​ | ​ | ​ | ​ | 24.2% | ​ | ​
​ | Tax effect on operating income | ​ | ​ | ​ | ​ | (111,124) | ​ | ​ | ​ | ​ | ​ | (119,872) | ​ | ​ | ​ | ​ | ​ | (67,681) | ​ | ​ | ​ | ​ | ​ | (54,681) | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | After-tax operating income | ​ | ​ | ​ | $ | 180,433 | ​ | ​ | ​ | ​ | $ | 313,317 | ​ | ​ | ​ | ​ | $ | 219,104 | ​ | ​ | ​ | ​ | $ | 171,272 | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Average invested capital | ​ | ​ | ​ | $ | 2,504,474 | ​ | ​ | ​ | ​ | $ | 2,437,232 | ​ | ​ | ​ | ​ | $ | 2,176,577 | ​ | ​ | ​ | ​ | $ | 1,975,693 | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Return on invested capital | ​ | ​ | ​ | ​ | 7.2% | ​ | ​ | ​ | ​ | ​ | 12.9% | ​ | ​ | ​ | ​ | ​ | 10.1% | ​ | ​ | ​ | ​ | ​ | 8.7% | ​ | ​
​ | Operating income | ​ | ​ | ​ | $ | 291,557 | ​ | ​ | ​ | ​ | ​ | 433,249 | ​ | ​ | ​ | ​ | ​ | 286,785 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
​ | Impairment of long-lived assets | ​ | ​ | ​ | ​ | 140,844 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 27,911 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
​ | Realignment charges | ​ | ​ | ​ | ​ | 35,210 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 4,052 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
​ | Other non-recurring charges | ​ | ​ | ​ | ​ | 5,626 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
​ | Prospera intangible asset amortization | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 6,580 | ​ | ​ | ​ | ​ | ​ | 3,396 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
​ | Prospera stock-based compensation | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 9,896 | ​ | ​ | ​ | ​ | ​ | 5,240 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
​ | Write-off of a receivable | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 5,545 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
​ | Acquisition diligence | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 1,120 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Adjusted operating income | ​ | ​ | ​ | $ | 473,237 | ​ | ​ | ​ | ​ | $ | 449,725 | ​ | ​ | ​ | ​ | $ | 334,049 | ​ | ​ | ​ | ​ | $ | — | ​ | ​
​ | Adjusted effective tax rate | ​ | ​ | ​ | ​ | 25.9% | ​ | ​ | ​ | ​ | ​ | 27.7% | ​ | ​ | ​ | ​ | ​ | 23.6% | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
​ | Tax effect on adjusted operating income | ​ | ​ | ​ | ​ | (122,665) | ​ | ​ | ​ | ​ | ​ | (124,431) | ​ | ​ | ​ | ​ | ​ | (78,836) | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | After-tax adjusted operating income | ​ | ​ | ​ | $ | 350,572 | ​ | ​ | ​ | ​ | $ | 325,294 | ​ | ​ | ​ | ​ | $ | 255,213 | ​ | ​ | ​ | ​ | $ | — | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Average invested capital | ​ | ​ | ​ | $ | 2,504,474 | ​ | ​ | ​ | ​ | $ | 2,437,232 | ​ | ​ | ​ | ​ | $ | 2,176,577 | ​ | ​ | ​ | ​ | $ | — | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Adjusted return on invested capital | ​ | ​ | ​ | ​ | 14.0% | ​ | ​ | ​ | ​ | ​ | 13.3% | ​ | ​ | ​ | ​ | ​ | 11.7% | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
​ | Total Assets | ​ | ​ | ​ | $ | 3,477,448 | ​ | ​ | ​ | ​ | $ | 3,556,996 | ​ | ​ | ​ | ​ | $ | 3,447,249 | ​ | ​ | ​ | ​ | $ | 2,953,160 | ​ | ​
​ | Less: Defined benefit pension asset | ​ | ​ | ​ | ​ | (15,404) | ​ | ​ | ​ | ​ | ​ | (24,216) | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
​ | Less: Accounts payable | ​ | ​ | ​ | ​ | (358,311) | ​ | ​ | ​ | ​ | ​ | (360,312) | ​ | ​ | ​ | ​ | ​ | (347,841) | ​ | ​ | ​ | ​ | ​ | (268,099) | ​ | ​
​ | Less: Accrued expenses | ​ | ​ | ​ | ​ | (277,764) | ​ | ​ | ​ | ​ | ​ | (248,320) | ​ | ​ | ​ | ​ | ​ | (253,330) | ​ | ​ | ​ | ​ | ​ | (227,735) | ​ | ​
​ | Less: Contract liabilities | ​ | ​ | ​ | ​ | (70,978) | ​ | ​ | ​ | ​ | ​ | (172,915) | ​ | ​ | ​ | ​ | ​ | (135,746) | ​ | ​ | ​ | ​ | ​ | (130,018) | ​ | ​
​ | Less: Income Tax payable | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | (3,664) | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
​ | Less: Dividends payable | ​ | ​ | ​ | ​ | (12,125) | ​ | ​ | ​ | ​ | ​ | (11,742) | ​ | ​ | ​ | ​ | ​ | (10,616) | ​ | ​ | ​ | ​ | ​ | (9,556) | ​ | ​
​ | Less: Deferred income taxes | ​ | ​ | ​ | ​ | (21,205) | ​ | ​ | ​ | ​ | ​ | (41,091) | ​ | ​ | ​ | ​ | ​ | (47,849) | ​ | ​ | ​ | ​ | ​ | (41,689) | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Less: Operating lease liabilities | ​ | ​ | ​ | ​ | (162,743) | ​ | ​ | ​ | ​ | ​ | (155,469) | ​ | ​ | ​ | ​ | ​ | (147,759) | ​ | ​ | ​ | ​ | ​ | (80,202) | ​ | ​
​ | Less: Deferred compensation | ​ | ​ | ​ | ​ | (32,623) | ​ | ​ | ​ | ​ | ​ | (30,316) | ​ | ​ | ​ | ​ | ​ | (35,373) | ​ | ​ | ​ | ​ | ​ | (44,519) | ​ | ​
​ | Less: Defined benefit pension liability | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | (536) | ​ | ​ | ​ | ​ | ​ | (118,523) | ​ | ​
​ | Less: Other non-current liabilities | ​ | ​ | ​ | ​ | (12,818) | ​ | ​ | ​ | ​ | ​ | (13,480) | ​ | ​ | ​ | ​ | ​ | (89,207) | ​ | ​ | ​ | ​ | ​ | (58,687) | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Total invested capital | ​ | ​ | ​ | $ | 2,513,477 | ​ | ​ | ​ | ​ | $ | 2,495,471 | ​ | ​ | ​ | ​ | $ | 2,378,992 | ​ | ​ | ​ | ​ | $ | 1,974,162 | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Beginning invested capital | ​ | ​ | ​ | $ | 2,495,471 | ​ | ​ | ​ | ​ | $ | 2,378,992 | ​ | ​ | ​ | ​ | $ | 1,974,162 | ​ | ​ | ​ | ​ | $ | 1,977,223 | ​ | ​
​ | Average invested capital | ​ | ​ | ​ | $ | 2,504,474 | ​ | ​ | ​ | ​ | $ | 2,437,232 | ​ | ​ | ​ | ​ | $ | 2,176,577 | ​ | ​ | ​ | ​ | $ | 1,975,693 | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
The adjusted effective tax rate for fiscal 2023 excluded the effects of the impairment of long-lived assets of $140.8 million, realignment charges of $35.2 million, non-recurring charges associated with major scope changes for two strategic projects initiated by departed senior leadership of $5.6 million, loss from Argentine peso hyperinflation of $5.1 million, and non-recurring tax benefit items of $3.6 million. The effective tax rate including these items was 38.1%. The adjusted effective tax rate for fiscal 2022 excluded the effects of the $33.3 million loss from the divestiture of the offshore wind energy structure business which is not deductible for income tax purposes. The effective rate including the loss on the divestiture is 29.9%. The adjusted effective tax rates for fiscal 2020 excluded the effects of the $12.575 million goodwill impairments which are not deductible for income tax purposes. The effective tax rate in 2020 including the impairments is 25.7%. |  |  |  |
Company Selected Measure Name |  |  |  | Adjusted ROIC |  |  |  |
Named Executive Officers, Footnote |  |  | (1) Compensation for CEOs reflects the amounts reported in the Summary Compensation Table (“SCT”) for Mr. Applbaum and Mr. Kaniewski for 2023 and for Mr. Kaniewski for 2022, 2021 and 2020. Mr. Francis was a Non-CEO NEO in 2023. Ms. Larkin and Messers. Schapper and Parnell were Non-CEO NEOs in 2023, 2022 and 2021. Ms. Larkin and Messers. Applbaum, Schapper, Laterreur, and Jaksich (who was the Company’s CFO until March 30, 2020) were Non-CEO NEOs in 2020. Average compensation for Non-CEO NEOs is based on the compensation of the NEOs for the relevant period. |  |  |  |  |
Peer Group Issuers, Footnote |  |  |  | (4) S&P 400 Industrial Machinery Index. |  |  |  |
PEO Total Compensation Amount |  |  |  |  | $ 8,674,260 | $ 7,337,975 | $ 6,432,086 |
PEO Actually Paid Compensation Amount |  |  |  |  | 21,710,433 | 16,362,423 | 9,973,234 |
Adjustment To PEO Compensation, Footnote |  |  |  | (2) The SCT Total amounts for CEOs for 2023 were adjusted as set forth below to compute the compensation actually paid. The FY 2023 deductions in value reflect the decreases in value of options and RSUs during the fiscal year. VMI’s stock price on the first day of fiscal 2023 was $330.30 and on the last day of fiscal 2023 (December 4 used for example) was $233.51. ​
​ | ​ | ​ | ​ | Deduction of the Amounts of Equity Awards Reported in SCT for Fiscal Year | ​ | ​ | Addition of Fair Value of Outstanding and Unvested Equity Awards Granted During the Fiscal Year as of the End of the Fiscal Year ($) | ​ | ​ | Change in Fair Value From Prior Fiscal Year of Outstanding and Unvested Equity Awards Granted in Any Prior Fiscal Year as of the End of the Fiscal Year ($) | ​ | ​ | Change in Fair Value as of the Vesting Date from the Prior Fiscal Year of Equity Awards Vesting in the Fiscal Year ($) | ​ | ​ | Fair Value of Equity Awards as of the Prior Fiscal Year of Awards that Failed Vesting Conditions in Fiscal Year ($) | ​
​ | Fiscal Year | ​ | ​ | Stock Awards ($) | ​ | ​ | Options ($) | ​
​ | 2023 (Applbaum) | ​ | ​ | ​ | ​ | (-2,555,897) | ​ | ​ | ​ | ​ | ​ | (-1,599,138) | ​ | ​ | ​ | ​ | ​ | 4,129,787 | ​ | ​ | ​ | ​ | ​ | (-581,354) | ​ | ​ | ​ | ​ | ​ | (-1,044,206) | ​ | ​ | ​ | ​ | ​ | 0 | ​ | ​
​ | 2023 (Kaniewski) | ​ | ​ | ​ | ​ | (-2,671,481) | ​ | ​ | ​ | ​ | ​ | 0 | ​ | ​ | ​ | ​ | ​ | 731,374 | ​ | ​ | ​ | ​ | ​ | 0 | ​ | ​ | ​ | ​ | ​ | (-4,669,369)(a) | ​ | ​ | ​ | ​ | ​ | (-5,033,188)(b) | ​ | ​
(a) Reflects decrease in value of 4,797 RSUs, 17,732 Options and 19,279 PSUs. (b) Reflects loss of value of forfeited 4,102 RSUs, 15,098 Options and 2,899 PSUs. |  |  |  |
Non-PEO NEO Average Total Compensation Amount |  |  |  | $ 2,572,221 | 2,258,298 | 1,944,076 | 1,634,815 |
Non-PEO NEO Average Compensation Actually Paid Amount |  |  |  | $ 1,409,666 | 4,865,986 | 3,485,985 | 2,003,714 |
Adjustment to Non-PEO NEO Compensation Footnote |  |  |  | (3) The Average SCT Total amounts for the Non-CEO NEOs were adjusted to compute the compensation actually paid as follows:
​ | ​ | ​ | ​ | Deduction of the Amounts of Equity Awards Reported in SCT for Fiscal Year | ​ | ​ | Addition of Fair Value of Outstanding and Unvested Equity Awards Granted During the Fiscal Year as of the End of the Fiscal Year ($) | ​ | ​ | Change in Fair Value From Prior Fiscal Year of Outstanding and Unvested Equity Awards Granted in Any Prior Fiscal Year as of the End of the Fiscal Year ($) | ​ | ​ | Change in Fair Value as of the Vesting Date from the Prior Fiscal Year of Equity Awards Vesting in the Fiscal Year ($) | ​ | ​ | Fair Value of Equity Awards as of the Prior Fiscal Year of Awards that Failed Vesting Conditions in Fiscal Year ($) | ​
​ | Fiscal Year | ​ | ​ | Stock Awards ($) | ​ | ​ | Options ($) | ​
​ | 2023 | ​ | ​ | ​ | ​ | (-1,228,355) | ​ | ​ | ​ | ​ | ​ | (-253,044) | ​ | ​ | ​ | ​ | ​ | 1,408,760 | ​ | ​ | ​ | ​ | ​ | (-384,405) | ​ | ​ | ​ | ​ | ​ | (-705,510) | ​ | ​ | ​ | ​ | ​ | 0 | ​ | ​
Compensation Actually Paid vs. Total Shareholder Return |  |  |  |  |  |  |  |
Compensation Actually Paid vs. Net Income |  |  |  |  |  |  |  |
Compensation Actually Paid vs. Company Selected Measure |  |  |  |  |  |  |  |
Total Shareholder Return Vs Peer Group |  |  |  |  |  |  |  |
Tabular List, Table |  |  |  | Most Important Financial Performance Measures for 2023 In our assessment, the three most important financial measures we use to link compensation actually paid to the CEO and Non-CEO NEOs to Company performance for fiscal 2023 are: ■ Adjusted ROIC ​ ■ Net earnings ​ ■ Cumulative compound operating income growth ​ |  |  |  |
Total Shareholder Return Amount |  |  |  | $ 161.88 | 227.19 | 166.76 | 116.22 |
Peer Group Total Shareholder Return Amount |  |  |  | $ 159.52 | 116.64 | 133.14 | $ 116.87 |
Net Income (Loss) |  |  |  |  | $ 13.3 | 11.7 |  |
Company Selected Measure Amount |  |  |  | 14 |  |  | 8.7 |
PEO Name | Mr. Applbaum | Mr. Kaniewski |  |  |  |  |  |
Additional 402(v) Disclosure |  |  |  |  |  |  |  |
Share Price | $ / shares |  |  | $ 233.51 |  | $ 330.3 |  |  |
Operating Income (Loss) |  |  |  | $ 291,557,000 | $ 433,249,000 | $ 286,785,000 | $ 225,953,000 |
Effective Income Tax Rate Reconciliation, Percent |  |  |  | 38.10% | 27.70% | 23.60% | 24.20% |
Income Tax Expense (Benefit) |  |  |  | $ (111,124,000) | $ (119,872,000) | $ (67,681,000) | $ (54,681,000) |
Net Income (Loss) Available to Common Stockholders, Basic |  |  |  | 180,433,000 | 313,317,000 | 219,104,000 | 171,272,000 |
Average Investment Capital | $ 2,504,474,000 |  | $ 2,437,232,000 | $ 2,504,474,000 | $ 2,437,232,000 | $ 2,176,577,000 | $ 1,975,693,000 |
Percentage of Return on Invested Capital |  |  |  | 7.20% | 12.90% | 10.10% | 8.70% |
Impairment of Long-Lived Assets to be Disposed of |  |  |  | $ 140,844,000 |  | $ 27,911,000 |  |
Restructuring Charges |  |  |  | 35,210,000 |  | 4,052,000 |  |
Other Non-Recurring Charges |  |  |  | 5,626,000 |  |  |  |
Amortization of Intangible Assets |  |  |  |  | 6,580,000 | 3,396,000 |  |
Share-Based Payment Arrangement, Expense |  |  |  |  | 9,896,000 | 5,240,000 |  |
Write Off Of Receivable |  |  |  |  |  | 5,545,000 |  |
Acquisition Diligence Expense |  |  |  |  |  | 1,120,000 |  |
Adjusted Operating Income (Loss) |  |  |  | $ 473,237,000 | $ 449,725,000 | $ 334,049,000 |  |
Adjusted Effective Tax Rate Reconciliation, Percentage |  |  |  | 25.90% | 27.70% | 23.60% |  |
Tax Effect On Adjusted Operating Income (Loss) |  |  |  | $ (122,665,000) | $ (124,431,000) | $ (78,836,000) |  |
Adjusted Operating Income (Loss), After Tax |  |  |  | $ 350,572,000 | $ 325,294,000 | $ 255,213,000 |  |
Percentage Of Adjusted Return On Invested Capital |  |  |  | 14.00% | 13.30% | 11.70% |  |
Assets | 3,477,448,000 |  |  | $ 3,477,448,000 | $ 3,556,996,000 | $ 3,447,249,000 | $ 2,953,160,000 |
Defined Benefit Plan, Plan Assets, Amount | (15,404,000) |  |  | (15,404,000) | (24,216,000) |  |  |
Accounts Payable | 358,311,000 |  |  | 358,311,000 | 360,312,000 | 347,841,000 | 268,099,000 |
Accrued Liabilities | 277,764,000 |  |  | 277,764,000 | 248,320,000 | 253,330,000 | 227,735,000 |
Contract with Customer, Liability | 70,978,000 |  |  | 70,978,000 | 172,915,000 | 135,746,000 | 130,018,000 |
Taxes Payable |  |  |  |  | 3,664,000 |  |  |
Dividends Payable | 12,125,000 |  |  | 12,125,000 | 11,742,000 | 10,616,000 | 9,556,000 |
Deferred Tax Liabilities, Gross | 21,205,000 |  |  | 21,205,000 | 41,091,000 | 47,849,000 | 41,689,000 |
Operating Lease, Liability | 162,743,000 |  |  | 162,743,000 | 155,469,000 | 147,759,000 | 80,202,000 |
Deferred Compensation Liability, Current and Noncurrent | 32,623,000 |  |  | 32,623,000 | 30,316,000 | 35,373,000 | 44,519,000 |
Liability, Defined Benefit Pension Plan |  |  |  |  |  | 536,000 | 118,523,000 |
Other Liabilities, Noncurrent | 12,818,000 |  |  | 12,818,000 | 13,480,000 | 89,207,000 | 58,687,000 |
Investment Capital | $ 2,513,477,000 |  |  | 2,513,477,000 | 2,495,471,000 | $ 2,378,992,000 | 1,974,162,000 | $ 1,977,223,000
Loss From Currency Hyperinflation |  |  |  | 5,100,000 |  |  |  |
Non-Recurring Tax Benefit |  |  |  | $ 3,600,000 |  |  |  |
Loss from Divestiture |  |  |  |  | $ 33,300,000 |  |  |
Effective Rate Including Loss on Divestiture |  |  |  |  | 29.90% |  |  |
Goodwill, Impairment Loss |  |  |  |  |  |  | $ 12,575,000 |
Effective Income Tax Rate Including Impairment |  |  |  |  |  |  | 25.70% |
Measure:: 1 |  |  |  |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |  |  |  |
Name |  |  |  | Adjusted ROIC |  |  |  |
Non-GAAP Measure Description |  |  |  | (5) Valmont selected adjusted return on invested capital (“adjusted ROIC”) as a company specific financial measure that links financial results and performance. A significant portion of an executives long-term performance award is based on adjusted ROIC. ROIC and adjusted ROIC are non-GAAP financial measures. ROIC and adjusted ROIC are calculated from the Company’s audited financial statements as follows: ​
​ | Dollars in Thousands | ​ | ​ | 2023 | ​ | ​ | 2022 | ​ | ​ | 2021 | ​ | ​ | 2020 | ​
​ | Operating Income | ​ | ​ | ​ | $ | 291,557 | ​ | ​ | ​ | ​ | $ | 433,249 | ​ | ​ | ​ | ​ | $ | 286,785 | ​ | ​ | ​ | ​ | $ | 225,953 | ​ | ​
​ | Adjusted effective tax rate | ​ | ​ | ​ | ​ | 38.1% | ​ | ​ | ​ | ​ | ​ | 27.7% | ​ | ​ | ​ | ​ | ​ | 23.6% | ​ | ​ | ​ | ​ | ​ | 24.2% | ​ | ​
​ | Tax effect on operating income | ​ | ​ | ​ | ​ | (111,124) | ​ | ​ | ​ | ​ | ​ | (119,872) | ​ | ​ | ​ | ​ | ​ | (67,681) | ​ | ​ | ​ | ​ | ​ | (54,681) | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | After-tax operating income | ​ | ​ | ​ | $ | 180,433 | ​ | ​ | ​ | ​ | $ | 313,317 | ​ | ​ | ​ | ​ | $ | 219,104 | ​ | ​ | ​ | ​ | $ | 171,272 | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Average invested capital | ​ | ​ | ​ | $ | 2,504,474 | ​ | ​ | ​ | ​ | $ | 2,437,232 | ​ | ​ | ​ | ​ | $ | 2,176,577 | ​ | ​ | ​ | ​ | $ | 1,975,693 | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Return on invested capital | ​ | ​ | ​ | ​ | 7.2% | ​ | ​ | ​ | ​ | ​ | 12.9% | ​ | ​ | ​ | ​ | ​ | 10.1% | ​ | ​ | ​ | ​ | ​ | 8.7% | ​ | ​
​ | Operating income | ​ | ​ | ​ | $ | 291,557 | ​ | ​ | ​ | ​ | ​ | 433,249 | ​ | ​ | ​ | ​ | ​ | 286,785 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
​ | Impairment of long-lived assets | ​ | ​ | ​ | ​ | 140,844 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 27,911 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
​ | Realignment charges | ​ | ​ | ​ | ​ | 35,210 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 4,052 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
​ | Other non-recurring charges | ​ | ​ | ​ | ​ | 5,626 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
​ | Prospera intangible asset amortization | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 6,580 | ​ | ​ | ​ | ​ | ​ | 3,396 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
​ | Prospera stock-based compensation | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 9,896 | ​ | ​ | ​ | ​ | ​ | 5,240 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
​ | Write-off of a receivable | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 5,545 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
​ | Acquisition diligence | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 1,120 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Adjusted operating income | ​ | ​ | ​ | $ | 473,237 | ​ | ​ | ​ | ​ | $ | 449,725 | ​ | ​ | ​ | ​ | $ | 334,049 | ​ | ​ | ​ | ​ | $ | — | ​ | ​
​ | Adjusted effective tax rate | ​ | ​ | ​ | ​ | 25.9% | ​ | ​ | ​ | ​ | ​ | 27.7% | ​ | ​ | ​ | ​ | ​ | 23.6% | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
​ | Tax effect on adjusted operating income | ​ | ​ | ​ | ​ | (122,665) | ​ | ​ | ​ | ​ | ​ | (124,431) | ​ | ​ | ​ | ​ | ​ | (78,836) | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | After-tax adjusted operating income | ​ | ​ | ​ | $ | 350,572 | ​ | ​ | ​ | ​ | $ | 325,294 | ​ | ​ | ​ | ​ | $ | 255,213 | ​ | ​ | ​ | ​ | $ | — | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Average invested capital | ​ | ​ | ​ | $ | 2,504,474 | ​ | ​ | ​ | ​ | $ | 2,437,232 | ​ | ​ | ​ | ​ | $ | 2,176,577 | ​ | ​ | ​ | ​ | $ | — | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Adjusted return on invested capital | ​ | ​ | ​ | ​ | 14.0% | ​ | ​ | ​ | ​ | ​ | 13.3% | ​ | ​ | ​ | ​ | ​ | 11.7% | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
​ | Total Assets | ​ | ​ | ​ | $ | 3,477,448 | ​ | ​ | ​ | ​ | $ | 3,556,996 | ​ | ​ | ​ | ​ | $ | 3,447,249 | ​ | ​ | ​ | ​ | $ | 2,953,160 | ​ | ​
​ | Less: Defined benefit pension asset | ​ | ​ | ​ | ​ | (15,404) | ​ | ​ | ​ | ​ | ​ | (24,216) | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
​ | Less: Accounts payable | ​ | ​ | ​ | ​ | (358,311) | ​ | ​ | ​ | ​ | ​ | (360,312) | ​ | ​ | ​ | ​ | ​ | (347,841) | ​ | ​ | ​ | ​ | ​ | (268,099) | ​ | ​
​ | Less: Accrued expenses | ​ | ​ | ​ | ​ | (277,764) | ​ | ​ | ​ | ​ | ​ | (248,320) | ​ | ​ | ​ | ​ | ​ | (253,330) | ​ | ​ | ​ | ​ | ​ | (227,735) | ​ | ​
​ | Less: Contract liabilities | ​ | ​ | ​ | ​ | (70,978) | ​ | ​ | ​ | ​ | ​ | (172,915) | ​ | ​ | ​ | ​ | ​ | (135,746) | ​ | ​ | ​ | ​ | ​ | (130,018) | ​ | ​
​ | Less: Income Tax payable | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | (3,664) | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
​ | Less: Dividends payable | ​ | ​ | ​ | ​ | (12,125) | ​ | ​ | ​ | ​ | ​ | (11,742) | ​ | ​ | ​ | ​ | ​ | (10,616) | ​ | ​ | ​ | ​ | ​ | (9,556) | ​ | ​
​ | Less: Deferred income taxes | ​ | ​ | ​ | ​ | (21,205) | ​ | ​ | ​ | ​ | ​ | (41,091) | ​ | ​ | ​ | ​ | ​ | (47,849) | ​ | ​ | ​ | ​ | ​ | (41,689) | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Less: Operating lease liabilities | ​ | ​ | ​ | ​ | (162,743) | ​ | ​ | ​ | ​ | ​ | (155,469) | ​ | ​ | ​ | ​ | ​ | (147,759) | ​ | ​ | ​ | ​ | ​ | (80,202) | ​ | ​
​ | Less: Deferred compensation | ​ | ​ | ​ | ​ | (32,623) | ​ | ​ | ​ | ​ | ​ | (30,316) | ​ | ​ | ​ | ​ | ​ | (35,373) | ​ | ​ | ​ | ​ | ​ | (44,519) | ​ | ​
​ | Less: Defined benefit pension liability | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | (536) | ​ | ​ | ​ | ​ | ​ | (118,523) | ​ | ​
​ | Less: Other non-current liabilities | ​ | ​ | ​ | ​ | (12,818) | ​ | ​ | ​ | ​ | ​ | (13,480) | ​ | ​ | ​ | ​ | ​ | (89,207) | ​ | ​ | ​ | ​ | ​ | (58,687) | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Total invested capital | ​ | ​ | ​ | $ | 2,513,477 | ​ | ​ | ​ | ​ | $ | 2,495,471 | ​ | ​ | ​ | ​ | $ | 2,378,992 | ​ | ​ | ​ | ​ | $ | 1,974,162 | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Beginning invested capital | ​ | ​ | ​ | $ | 2,495,471 | ​ | ​ | ​ | ​ | $ | 2,378,992 | ​ | ​ | ​ | ​ | $ | 1,974,162 | ​ | ​ | ​ | ​ | $ | 1,977,223 | ​ | ​
​ | Average invested capital | ​ | ​ | ​ | $ | 2,504,474 | ​ | ​ | ​ | ​ | $ | 2,437,232 | ​ | ​ | ​ | ​ | $ | 2,176,577 | ​ | ​ | ​ | ​ | $ | 1,975,693 | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
The adjusted effective tax rate for fiscal 2023 excluded the effects of the impairment of long-lived assets of $140.8 million, realignment charges of $35.2 million, non-recurring charges associated with major scope changes for two strategic projects initiated by departed senior leadership of $5.6 million, loss from Argentine peso hyperinflation of $5.1 million, and non-recurring tax benefit items of $3.6 million. The effective tax rate including these items was 38.1%. The adjusted effective tax rate for fiscal 2022 excluded the effects of the $33.3 million loss from the divestiture of the offshore wind energy structure business which is not deductible for income tax purposes. The effective rate including the loss on the divestiture is 29.9%. The adjusted effective tax rates for fiscal 2020 excluded the effects of the $12.575 million goodwill impairments which are not deductible for income tax purposes. The effective tax rate in 2020 including the impairments is 25.7%. |  |  |  |
Measure:: 2 |  |  |  |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |  |  |  |
Name |  |  |  | Net earnings |  |  |  |
Measure:: 3 |  |  |  |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |  |  |  |
Name |  |  |  | Cumulative compound operating income growth |  |  |  |
Avner M. Applbaum [Member] |  |  |  |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |  |  |  |
PEO Total Compensation Amount |  |  |  | $ 5,956,400 |  |  |  |
PEO Actually Paid Compensation Amount |  |  |  | 4,305,592 |  |  |  |
Avner M. Applbaum [Member] | Deduction Of The Amounts Of Stock Awards Reported in SCT for Fiscal Year [Member] |  |  |  |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |  |  |  |
Adjustment to Compensation, Amount |  |  |  | (2,555,897) |  |  |  |
Avner M. Applbaum [Member] | Deduction Of The Amounts Of Option Awards Reported in SCT for Fiscal Year [Member] |  |  |  |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |  |  |  |
Adjustment to Compensation, Amount |  |  |  | (1,599,138) |  |  |  |
Avner M. Applbaum [Member] | Year-end Fair Value Of Awards Granted In The Current Fiscal Year [Member] |  |  |  |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |  |  |  |
Adjustment to Compensation, Amount |  |  |  | 4,129,787 |  |  |  |
Avner M. Applbaum [Member] | Change In Fair Value Of Outstanding And Unvested Awards Granted In Prior Fiscal Years [Member] |  |  |  |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |  |  |  |
Adjustment to Compensation, Amount |  |  |  | (581,354) |  |  |  |
Avner M. Applbaum [Member] | Change In Fair Value As Of Vesting Date Of Prior Year Awards Vested During Current Year [Member] |  |  |  |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |  |  |  |
Adjustment to Compensation, Amount |  |  |  | (1,044,206) |  |  |  |
Avner M. Applbaum [Member] | Adjustments For Equity Awards Failed To Meet Performance Conditions [Member] |  |  |  |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |  |  |  |
Adjustment to Compensation, Amount |  |  |  | 0 |  |  |  |
Stephen G. Kaniewski [Member] |  |  |  |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |  |  |  |
PEO Total Compensation Amount |  |  |  | 6,280,307 |  |  |  |
PEO Actually Paid Compensation Amount |  |  |  | (5,362,357) |  |  |  |
Stephen G. Kaniewski [Member] | Deduction Of The Amounts Of Stock Awards Reported in SCT for Fiscal Year [Member] |  |  |  |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |  |  |  |
Adjustment to Compensation, Amount |  |  |  | (2,671,481) |  |  |  |
Stephen G. Kaniewski [Member] | Deduction Of The Amounts Of Option Awards Reported in SCT for Fiscal Year [Member] |  |  |  |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |  |  |  |
Adjustment to Compensation, Amount |  |  |  | 0 |  |  |  |
Stephen G. Kaniewski [Member] | Year-end Fair Value Of Awards Granted In The Current Fiscal Year [Member] |  |  |  |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |  |  |  |
Adjustment to Compensation, Amount |  |  |  | 731,374 |  |  |  |
Stephen G. Kaniewski [Member] | Change In Fair Value Of Outstanding And Unvested Awards Granted In Prior Fiscal Years [Member] |  |  |  |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |  |  |  |
Adjustment to Compensation, Amount |  |  |  | 0 |  |  |  |
Stephen G. Kaniewski [Member] | Change In Fair Value As Of Vesting Date Of Prior Year Awards Vested During Current Year [Member] |  |  |  |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |  |  |  |
Adjustment to Compensation, Amount |  |  |  | (4,669,369) |  |  |  |
Change In Fair Value As Of Vesting Date From Prior Fiscal Year Of Equity Awards Vesting In Fiscal Year, Number Of Restricted Stock Units | shares |  |  | 4,797 |  |  |  |  |
Change In Fair Value As Of Vesting Date From Prior Fiscal Year Of Equity Awards Vesting In Fiscal Year, Number Of Stock Options | shares |  |  | 17,732 |  |  |  |  |
Change In Fair Value As Of Vesting Date From Prior Fiscal Year Of Equity Awards Vesting In Fiscal Year, Number Of Performance-Based Restricted Stock Units | shares |  |  | 19,279 |  |  |  |  |
Stephen G. Kaniewski [Member] | Adjustments For Equity Awards Failed To Meet Performance Conditions [Member] |  |  |  |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |  |  |  |
Adjustment to Compensation, Amount |  |  |  | (5,033,188) |  |  |  |
Number Of Restricted Stock Units, That Failed To Meet Vesting Conditions | shares |  |  | 4,102 |  |  |  |  |
Number Of Stock Options, That Failed To Meet Vesting Conditions | shares |  |  | 15,098 |  |  |  |  |
Number Of Performance-Based Restricted Stock Units, That Failed To Meet Vesting Conditions | shares |  |  | 2,899 |  |  |  |  |
Non-PEO NEO | Deduction Of The Amounts Of Stock Awards Reported in SCT for Fiscal Year [Member] |  |  |  |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |  |  |  |
Adjustment to Compensation, Amount |  |  |  | (1,228,355) |  |  |  |
Non-PEO NEO | Deduction Of The Amounts Of Option Awards Reported in SCT for Fiscal Year [Member] |  |  |  |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |  |  |  |
Adjustment to Compensation, Amount |  |  |  | (253,044) |  |  |  |
Non-PEO NEO | Year-end Fair Value Of Awards Granted In The Current Fiscal Year [Member] |  |  |  |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |  |  |  |
Adjustment to Compensation, Amount |  |  |  | 1,408,760 |  |  |  |
Non-PEO NEO | Change In Fair Value Of Outstanding And Unvested Awards Granted In Prior Fiscal Years [Member] |  |  |  |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |  |  |  |
Adjustment to Compensation, Amount |  |  |  | (384,405) |  |  |  |
Non-PEO NEO | Change In Fair Value As Of Vesting Date Of Prior Year Awards Vested During Current Year [Member] |  |  |  |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |  |  |  |
Adjustment to Compensation, Amount |  |  |  | (705,510) |  |  |  |
Non-PEO NEO | Adjustments For Equity Awards Failed To Meet Performance Conditions [Member] |  |  |  |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |  |  |  |
Adjustment to Compensation, Amount |  |  |  | $ 0 |  |  |  |

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Balance Type: | credit
Period Type: | instant

X
- Definition Amount of loss from hyperinflation of currency. + References No definition available. + Details
Name: | vmi_LossFromCurrencyHyperinflation
Namespace Prefix: | vmi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of loss from divestiture. + References No definition available. + Details
Name: | vmi_LossFromDivestiture
Namespace Prefix: | vmi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of non-recurring tax benefit received by the company. + References No definition available. + Details
Name: | vmi_NonRecurringTaxBenefit
Namespace Prefix: | vmi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Number of performance-based restricted stock units granted in prior fiscal year, that failed to meet vesting conditions during the current year. + References No definition available. + Details
Name: | vmi_NumberOfPerformanceBasedRestrictedStockUnitsThatFailedToMeetVestingConditions
Namespace Prefix: | vmi_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of restricted stock units granted in prior fiscal year, that failed to meet vesting conditions during the current year. + References No definition available. + Details
Name: | vmi_NumberOfRestrictedStockUnitsThatFailedToMeetVestingConditions
Namespace Prefix: | vmi_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of stock options granted in prior fiscal year, that failed to meet vesting conditions during the current year. + References No definition available. + Details
Name: | vmi_NumberOfStockOptionsThatFailedToMeetVestingConditions
Namespace Prefix: | vmi_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of non-recurring charges incurred by the company. + References No definition available. + Details
Name: | vmi_OtherNonRecurringCharges
Namespace Prefix: | vmi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The percentage of adjusted return on invested capital of the company. + References No definition available. + Details
Name: | vmi_PercentageOfAdjustedReturnOnInvestedCapital
Namespace Prefix: | vmi_
Data Type: | dtr:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage of return on invested capital. + References No definition available. + Details
Name: | vmi_PercentageOfReturnOnInvestedCapital
Namespace Prefix: | vmi_
Data Type: | dtr:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of tax effect on adjusted operating income (loss) of the company. + References No definition available. + Details
Name: | vmi_TaxEffectOnAdjustedOperatingIncomeLoss
Namespace Prefix: | vmi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of receivable written off during the period. + References No definition available. + Details
Name: | vmi_WriteOffOfReceivable
Namespace Prefix: | vmi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | ecd_MeasureAxis=1
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ecd_MeasureAxis=2
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ecd_MeasureAxis=3
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ecd_IndividualAxis=vmi_AvnerMApplbaumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ecd_AdjToCompAxis=vmi_DeductionOfTheAmountsOfStockAwardsReportedInSCTForFiscalYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ecd_AdjToCompAxis=vmi_DeductionOfTheAmountsOfOptionAwardsReportedInSCTForFiscalYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ecd_AdjToCompAxis=vmi_EquityAwardsAdjustmentsYearEndFairValueOfAwardsGrantedInCurrentYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ecd_AdjToCompAxis=vmi_EquityAwardsAdjustmentsChangeInFairValueAsOfYearEndOfOutstandingAndUnvestedAwardsGrantedInPriorYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ecd_AdjToCompAxis=vmi_EquityAwardsAdjustmentsChangeInFairValueAsOfVestingDateOfPriorYearAwardsVestedDuringCurrentYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ecd_AdjToCompAxis=vmi_EquityAwardsAdjustmentsAdjustmentsForEquityAwardsFailedToMeetPerformanceConditionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ecd_IndividualAxis=vmi_StephenGKaniewskiMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ecd_ExecutiveCategoryAxis=ecd_NonPeoNeoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |