Document And Entity Information Document Type Document Type Document Quarterly Report Document Period End Date Document Period End Date Current Fiscal Year End Date Current Fiscal Year End Date Document Transition Report Document Transition Report Securities Act File Number Entity File Number Entity Registrant Name Entity Registrant Name Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Tax Identification Number Entity Address, Address Line One Entity Address, Address Line One Entity Address, City or Town Entity Address, City or Town Entity Address, State or Province Entity Address, State or Province Entity Address, Postal Zip Code Entity Address, Postal Zip Code City Area Code City Area Code Local Phone Number Local Phone Number Title of 12(b) Security Title of 12(b) Security Trading Symbol Trading Symbol Security Exchange Name Security Exchange Name Entity Current Reporting Status Entity Current Reporting Status Entity Interactive Data Current Entity Interactive Data Current Entity Filer Category Entity Filer Category Entity Small Business Smaller Reporting Company Entity Emerging Growth Company Emerging Growth Company Entity Shell Company Shell Company Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Central Index Key Entity Central Index Key Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS Statement [Table] Statement [Table] Product and Service [Axis] Product and Service [Axis] Product and Service [Domain] Product and Service [Domain] Product [Member] Product sales Service [Member] Service sales Statement [Line Items] Statement Revenue from Contract with Customer, Excluding Assessed Tax Net sales Cost of Goods and Services Sold Cost of sales Total cost of sales Gross Profit Gross profit Selling, General and Administrative Expense Selling, general, and administrative expenses Impairment, Long-Lived Asset, Held-for-Use Impairment of long-lived assets Restructuring Charges Realignment charges Operating Income (Loss) Total operating income Operating income Nonoperating Income (Expense) [Abstract] Other income (expenses): Interest Expense, Nonoperating Interest expense Investment Income, Interest Interest income Debt and Equity Securities, Unrealized Gain (Loss) Gain on deferred compensation investments Other Nonoperating Income (Expense) Other, net Nonoperating Income (Expense) Total other expenses Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Earnings before income taxes and equity method investment loss Components of Income Tax Expense (Benefit), Continuing Operations [Abstract] Income tax expense (benefit): Current Income Tax Expense (Benefit) Current Deferred Income Tax Expense (Benefit) Deferred Deferred income taxes Income Tax Expense (Benefit) Income tax expense Total income tax expense Income (Loss) from Continuing Operations before Equity Method Investments and Noncontrolling Interest Income (Loss) from Continuing Operations before Equity Method Investments and Noncontrolling Interest Earnings (loss) before equity method investment loss Income (Loss) from Equity Method Investments Equity method investment loss Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net earnings (loss) Net earnings (loss) Net earnings Net Income (Loss) Attributable to Redeemable Noncontrolling Interest Earnings attributable to redeemable noncontrolling interests Net Income (Loss) Net earnings (loss) attributable to Valmont Industries, Inc. Net earnings (loss) NET EARNINGS (LOSS) PER SHARE Net earnings (loss) attributable to Valmont Industries, Inc. per share: Earnings Per Share, Basic Basic (in dollars per share) Basic (in dollars per share) Earnings Per Share, Diluted Diluted (in dollars per share) Diluted (in dollars per share) CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Other Comprehensive Income (Loss), Net of Tax [Abstract] Other comprehensive income (loss), net of tax: Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax [Abstract] Foreign currency translation adjustments: Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Unrealized translation gain (loss) Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax [Abstract] Hedging activities: Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), Reclassification, after Tax Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), Reclassification, after Tax Unrealized gain on commodity hedges Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), After Reclassification and Tax Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), After Reclassification and Tax Realized loss (gain) on commodity hedges included in net earnings (loss) Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net Unrealized gain (loss) on cross currency swaps Other Comprehensive Income (Loss) Amortization Cost (Benefit) Included in Interest Expense Other Comprehensive Income (Loss) Amortization Cost (Benefit) Included in Interest Expense Amortization cost included in interest expense Other Comprehensive Income Loss, Hedging Activities, Gain (loss), after Reclassification and Tax Other Comprehensive Income Loss, Hedging Activities, Gain (loss), after Reclassification and Tax Total hedging activities Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Reclassification adjustment for pension costs included in net earnings (loss) Other Comprehensive Income (Loss), Net of Tax Total other comprehensive income (loss), net of tax Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive income attributable to redeemable noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive income attributable to Valmont Industries, Inc. CONDENSED CONSOLIDATED BALANCE SHEETS Assets [Abstract] ASSETS Assets, Current [Abstract] Current assets: Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents Accounts Receivable, after Allowance for Credit Loss, Current Receivables, less allowance of $50,634 and $54,991, respectively Inventory, Net Inventories Contract with Customer, Asset, after Allowance for Credit Loss, Current Contract assets Income Taxes Receivable, Current Income taxes receivable Prepaid Expense and Other Assets, Current Prepaid expenses and other current assets Assets, Current Total current assets Property, Plant and Equipment, Gross Property, plant, and equipment, at cost Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Less accumulated depreciation Property, Plant and Equipment, Net Property, plant, and equipment, net Goodwill Balance at the end of the period Balance at the beginning of the period Goodwill Intangible Assets, Net (Excluding Goodwill) Other intangible assets, net Assets for Plan Benefits, Defined Benefit Plan Defined benefit pension asset Operating Lease, Right-of-Use Asset Operating lease right-of-use assets Deferred compensation investments Deferred Income Tax Assets, Net Non-current deferred tax asset Other Assets, Noncurrent Other non-current assets Disposal Group, Including Discontinued Operation, Assets, Noncurrent Non-current assets held for sale Assets Total assets Total assets Liabilities and Equity [Abstract] LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS, AND SHAREHOLDERS' EQUITY Liabilities, Current [Abstract] Current liabilities: Long-Term Debt, Current Maturities Current installments of long-term debt Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount, Current Mandatorily redeemable financial instrument Accounts Payable, Current Accounts payable Employee-related Liabilities, Current Accrued employee compensation and benefits Contract with Customer, Liability, Current Contract liabilities Accrued Liabilities, Current Other accrued expenses Taxes Payable, Current Income taxes payable Dividends Payable, Current Dividends payable Liabilities, Current Total current liabilities Deferred Income Tax Liabilities, Net Deferred income taxes Long-Term Debt, Excluding Current Maturities Long-term debt, excluding current installments Operating Lease, Liability, Noncurrent Operating lease liabilities Deferred Compensation Liability, Classified, Noncurrent Deferred compensation liabilities Other Liabilities, Noncurrent Other non-current liabilities Liabilities Total liabilities Redeemable Noncontrolling Interest, Equity, Carrying Amount Redeemable noncontrolling interests - Ending balance Redeemable noncontrolling interests - Beginning balance Redeemable noncontrolling interests Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Shareholders' equity: Common Stock, Value, Issued Common stock of $1 par value, authorized 75,000,000 shares; issued 27,900,000 shares Retained Earnings (Accumulated Deficit) Retained earnings Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive loss Accumulated other comprehensive loss Treasury Stock, Common, Value Treasury stock Value of shares repurchased since inception Equity, Attributable to Parent Total shareholders' equity - Ending balance Total shareholders' equity - Beginning balance Total shareholders' equity Liabilities and Equity Total liabilities, redeemable noncontrolling interests, and shareholders' equity Accounts Receivable, Allowance for Credit Loss, Current Receivables allowance Common Stock, Par or Stated Value Per Share Common stock, par value (in dollars per share) Common Stock, Shares Authorized Common stock, authorized shares (in shares) Common Stock, Shares, Issued Common stock, issued shares (in shares) CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS Net Cash Provided by (Used in) Operating Activities [Abstract] Cash flows from operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net earnings to net cash flows from operating activities: Depreciation, Depletion and Amortization Depreciation and amortization Total depreciation and amortization expense Payment for Pension Benefits Contribution to defined benefit pension plan Asset Impairment Charges Impairment of long-lived assets Share-Based Payment Arrangement, Noncash Expense Stock-based compensation Pension Expense (Reversal of Expense), Noncash Net periodic pension cost Gain (Loss) on Disposition of Property Plant Equipment Loss on sale of property, plant, and equipment Other Noncash Income (Expense) Other, net Increase (Decrease) in Operating Capital [Abstract] Changes in assets and liabilities: Increase (Decrease) in Receivables Receivables Increase (Decrease) in Inventories Inventories Increase (Decrease) in Contract with Customer, Asset Contract assets Increase (Decrease) in Prepaid Expense Prepaid expenses and other assets (current and non-current) Increase (Decrease) in Accounts Payable Accounts payable Increase (Decrease) in Contract with Customer, Liability Contract liabilities (current and non-current) Increase (Decrease) in Accrued Liabilities Accrued expenses Increase (Decrease) in Income Taxes Payable Current income taxes Increase (Decrease) in Other Operating Liabilities Other non-current liabilities Net Cash Provided by (Used in) Operating Activities Net cash flows from operating activities Net Cash Provided by (Used in) Investing Activities [Abstract] Cash flows from investing activities: Payments to Acquire Property, Plant, and Equipment Purchases of property, plant, and equipment Payments to Acquire Businesses, Net of Cash Acquired Acquisition, net of cash acquired Proceeds from Sale of Productive Assets Proceeds from sales of assets Proceeds from Insurance Settlement, Investing Activities Proceeds from property damage insurance claims Payments for (Proceeds from) Other Investing Activities Other, net Net Cash Provided by (Used in) Investing Activities Net cash flows from investing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Cash flows from financing activities: Proceeds from Short-Term Debt Proceeds from short-term borrowings Repayments of Short-Term Debt Repayments on short-term borrowings Proceeds from Issuance of Long-Term Debt Proceeds from long-term borrowings Repayments of Long-Term Debt Principal repayments on long-term borrowings Payments of Ordinary Dividends, Common Stock Dividends paid Payments of Ordinary Dividends, Noncontrolling Interest Dividend to redeemable noncontrolling interest PaymentsToAcquireAdditionalInterestInSubsidiariesFinancingActivities PaymentsToAcquireAdditionalInterestInSubsidiariesFinancingActivities Purchase of redeemable noncontrolling interest Payments for Repurchase of Common Stock Repurchases of common stock Amount of cash outflow for excise taxes upon share repurchases during the period classified as financing activities. Payments Of Excise Taxes On Share Repurchases Payments of excise taxes on share repurchases Proceeds from Stock Plans Proceeds from exercises under stock plans Payment, Tax Withholding, Share-Based Payment Arrangement Tax withholdings on exercises under stock plans Proceeds from (Payments for) Other Financing Activities Other, net Net Cash Provided by (Used in) Financing Activities Net cash flows from financing activities Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Continuing Operations Effect of exchange rate changes on cash and cash equivalents Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Net change in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Cash and cash equivalents-end of period Cash and cash equivalents-beginning of period Supplemental Cash Flow Information [Abstract] Supplemental disclosures of cash flow information: Interest Paid, Excluding Capitalized Interest, Operating Activities Interest paid Income Taxes Paid, Net Income taxes paid CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY AND REDEEMABLE NONCONTROLLING INTERESTS Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock [Member] Common stock Retained Earnings [Member] Retained earnings AOCI Attributable to Parent [Member] Accumulated other comprehensive loss Treasury Stock, Common [Member] Treasury stock This element represents Redeemable noncontrolling interests. Redeemable Noncontrolling Interests [Member] Redeemable noncontrolling interests Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Shareholders' Equity Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other comprehensive income (loss), net of tax Dividends, Common Stock, Cash Cash dividends declared Treasury Stock, Value, Acquired, Cost Method Repurchases of common stock; 357,979 shares acquired Repurchases of common stock Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Dividends to redeemable noncontrolling interests The amount of Fair value adjustment on redeemable noncontrolling interests. Fair Value Adjustment on Redeemable Noncontrolling Interests Fair value adjustment on redeemable noncontrolling interests APIC, Share-Based Payment Arrangement, Option, Increase for Cost Recognition Stock option and incentive plans Noncontrolling Interest, Change in Redemption Value Change in redemption value of redeemable noncontrolling interests Treasury Stock Reissued at Lower than Repurchase Price Stock options and incentive plans Shares repurchased Common Stock, Dividends, Per Share, Cash Paid Cash dividends declared (in dollars per share) Treasury Stock, Shares, Acquired Repurchases of common stock shares acquired (in shares) SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Policies [Text Block] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES REVENUE RECOGNITION Revenue from Contract with Customer [Text Block] REVENUE RECOGNITION ACQUISITIONS Business Combination Disclosure [Text Block] ACQUISITIONS INVENTORIES Inventory Disclosure [Text Block] INVENTORIES GOODWILL AND OTHER INTANGIBLE ASSETS Goodwill and Intangible Assets Disclosure [Text Block] GOODWILL AND OTHER INTANGIBLE ASSETS DERIVATIVE FINANCIAL INSTRUMENTS Derivative Instruments and Hedging Activities Disclosure [Text Block] DERIVATIVE FINANCIAL INSTRUMENTS FAIR VALUE MEASUREMENTS Fair Value Disclosures [Text Block] FAIR VALUE MEASUREMENTS Earnings Per Share [Text Block] NET EARNINGS (LOSS) PER SHARE INCOME TAXES Income Tax Disclosure [Text Block] INCOME TAXES STOCK-BASED COMPENSATION Share-Based Payment Arrangement [Text Block] STOCK-BASED COMPENSATION ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) Comprehensive Income (Loss) Note [Text Block] ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) SHARE REPURCHASES The entire disclosure for information about share repurchases. Share Repurchase Program [Text Block] SHARE REPURCHASES There is no custom definition. SUPPLIER FINANCE PROGRAM Supplier Finance Program [Text Block] SUPPLIER FINANCE PROGRAM CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] CONTINGENCIES BUSINESS SEGMENTS AND RELATED REVENUE INFORMATION Segment Reporting Disclosure [Text Block] BUSINESS SEGMENTS AND RELATED REVENUE INFORMATION Basis of Accounting, Policy [Policy Text Block] Basis of Presentation New Accounting Pronouncements, Policy [Policy Text Block] Recently Issued Accounting Pronouncements Disaggregation of Revenue [Table Text Block] Schedule of breakdown of revenue recognized over time and at a point in time by segment Schedule of Inventory, Current [Table Text Block] Schedule of Components of Inventories Schedule of Goodwill [Table Text Block] Schedule of carrying amount of goodwill Tabular disclosure of amortizable finite-lived intangible assets, in total and by major class, including the gross carrying amount and accumulated amortization, and indefinite-lived intangible assets not subject to amortization, excluding goodwill, in total and by major class. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Table Text Block] Schedule of components of other intangible assets Derivative [Table] Derivative [Table] Hedging Relationship [Axis] Hedging Relationship [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] Cash Flow Hedging [Member] Cash Flow Hedges Cash Flow Hedges Net Investment Hedging [Member] Net Investment Hedges Net Investment Hedges Derivative [Line Items] DERIVATIVE FINANCIAL INSTRUMENTS Derivatives and Fair Value [Text Block] Schedule of fair value of derivative instruments Derivative Instruments, Gain (Loss) [Table Text Block] Schedule of gains (losses) on derivatives recognized in the condensed consolidated statements of earnings Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] Schedule of notional amounts of outstanding derivative Fair Value, Assets Measured on Recurring Basis [Table Text Block] Schedule of carrying values and fair value measurements of the Company's financial assets and liabilities measured at fair value on a recurring basis Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of reconciliation of compute both basic and diluted earnings per share Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Schedule of stock-based compensation expense Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Schedule of accumulated other comprehensive income (loss) Schedule of Segment Reporting Information, by Segment [Table Text Block] Schedule of Segment Reporting Information of Sales and Operating Income Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Timing of Transfer of Good or Service [Axis] Timing of Transfer of Good or Service [Axis] Timing of Transfer of Good or Service [Domain] Timing of Transfer of Good or Service [Domain] Transferred at Point in Time [Member] Point in Time Transferred over Time [Member] Over Time Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] This segment consists of the manufacture and distribution of products and solutions to serve the infrastructure markets of utility, solar, lighting and transportation, and telecommunications, along with coatings services to preserve metal products. Infrastructure [Member] Infrastructure This segment consists of the manufacture of center pivot components and linear irrigation equipment for agricultural markets, including parts and tubular products, and advanced technology solutions for precision agriculture. Agriculture [Member] Agriculture Statement of Financial Position Location, Balance [Axis] Balance Sheet Location [Axis] Statement of Financial Position Location, Balance [Domain] Balance Sheet Location [Domain] Contract Liabilities Contract Liabilities [Member] Contract Liabilities Other Noncurrent Liabilities [Member] Other Noncurrent Liabilities Statistical Measurement [Axis] Statistical Measurement [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] Minimum [Member] Minimum Maximum [Member] Maximum Disaggregation of Revenue [Line Items] REVENUE RECOGNITION Contract with Customer, Liability Total contract liabilities Contract with Customer, Liability, Noncurrent Contract liabilities, noncurrent Contract with Customer, Liability, Revenue Recognized Revenue recognized from contract liability Revenue, Remaining Performance Obligation, Amount Remaining performance obligation Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Expected timing of performance obligation satisfaction Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Represents the information pertaining to RMDS Innovation, Inc. RMDS Innovation, Inc. [Member] RMDC Innovation, Inc. Business Acquisition [Line Items] Business Acquisition [Line Items] ACQUISITIONS Business Acquisition, Percentage of Voting Interests Acquired Percentage acquired Business Combination, Consideration Transferred Consideration transferred The number of installments in which the contingent consideration is payable under the business combination. Business Combination, Contingent Consideration, Number of Installments Number of installments Business Combination, Achieved in Stages, Preacquisition Equity Interest in Acquiree, Remeasurement, Gain (Loss) Gain on remeasurement of previously held equity interest Business Combination, Achieved in Stages, Preacquisition Equity Interest in Acquiree, Remeasurement, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Conceal Fab Conceal Fab [Member] ConcealFab Represents information pertaining to Valmont Substations, LLC Valmont Substations, LLC [Member] Valmont Substations, LLC Represents the information pertaining to Solbras Energia Solar do Brasil S.A. Solbras Energia Solar do Brasil S.A. [Member] Solbras Energia Solar do Brasil S.A. Redeemable Noncontrolling Interest, Equity, Common, Redemption Value Redeemable amount The amount of decrease (increase) in retained earnings due to redemption of non-controlling interests. Noncontrolling Interest Redemption, Decrease (Increase) from Retained Earnings Retained earnings Payments for Repurchase of Redeemable Noncontrolling Interest Amount paid for repurchase of redeemable noncontrolling interests Inventory, Net [Abstract] INVENTORIES Inventory, Raw Materials, Gross Raw materials and purchased parts Inventory, Work in Process, Gross Work in process Inventory, Finished Goods, Gross Finished and manufactured goods Inventory, Gross Total inventories Inventory Adjustments Inventory reserves Goodwill [Table] Schedule of Goodwill [Table] Reporting Unit [Axis] Reporting Unit [Domain] Represents the member information pertaining to Solar reporting unit. Solar Reporting Unit [Member] Solar Reporting Unit Represents the member information pertaining to Access Systems unit. Access Systems Unit [Member] Access Systems Goodwill [Line Items] Goodwill [Line Items] Goodwill, Gross Goodwill, Gross Goodwill, Impaired, Accumulated Impairment Loss Accumulated impairment losses Goodwill [Roll Forward] Carrying amount of goodwill Goodwill, Acquired During Period Acquisition Goodwill, Impairment Loss Impairment Goodwill Impairment loss Goodwill, Foreign Currency Translation Gain (Loss) Foreign currency translation Intangible Asset, Finite-Lived [Table] Schedule of Finite-Lived Intangible Assets [Table] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Customer Relationships [Member] Customer relationships Represents the patents and proprietary technology. Patents And Proprietary Technology [Member] Patents and proprietary technology Other Intangible Assets [Member] Other Finite-Lived Intangible Assets [Line Items] Components of amortized intangible assets Finite-Lived Intangible Assets, Gross Gross Carrying Amount Finite-Lived Intangible Assets, Accumulated Amortization Accumulated Amortization Finite-Lived Intangible Asset, Useful Life Weighted Average Life Amortization of Intangible Assets Amortization expense for intangible assets Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] Estimated Amortization Expense Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year Remainder of 2026 Finite-Lived Intangible Asset, Expected Amortization, Year Three 2029 Intangible Asset, Indefinite-Lived [Table] Schedule of Indefinite-Lived Intangible Assets [Table] Indefinite-Lived Intangible Assets [Axis] Indefinite-lived Intangible Assets [Axis] Indefinite-Lived Intangible Assets, Major Class Name [Domain] Indefinite-lived Intangible Assets, Major Class Name [Domain] Trade Names [Member] Trade names Indefinite-Lived Intangible Assets [Line Items] Indefinite-lived Intangible Assets Non-amortized intangible assets Indefinite-Lived Intangible Assets (Excluding Goodwill) Non-amortizing intangible assets Intangible Assets, Gross (Excluding Goodwill) [Abstract] Intangible Assets, Gross (Excluding Goodwill) Amortizing and non-amortizing intangible assets, Gross Carrying Amount Finite-Lived Intangible Assets, Net Intangible Assets, Accumulated Amortization Impairment of Intangible Assets, Indefinite-Lived (Excluding Goodwill) Impairment of intangible assets Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration] Impairment of Intangible Assets, Finite-Lived Impairment charge for certain long-lived assets Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Commodity Contract [Member] Commodity contracts Commodity contracts Cross Currency Interest Rate Contract [Member] Cross-currency swap contracts Prepaid Expenses and Other Current Assets [Member] Prepaid expenses and other current assets Accrued Liabilities [Member] Other accrued expenses Derivatives, Fair Value [Line Items] Fair Value of Derivatives Derivative Assets (Liabilities), at Fair Value, Net Derivative assets (liabilities), at fair value, net Derivative financial instruments, net Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Interest Rate Contract [Member] Interest rate hedge amortization Derivative Instruments, Gain (Loss) [Line Items] Gains (losses) on Derivatives Derivative, Gain (Loss) on Derivative, Net Derivative, gain (losses) on derivative, net Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Energy [Axis] Energy [Domain] Steel hot rolled coil ("HRC") forward contracts. Steel Hot Rolled Coil Forward Contracts [Member] Hot-rolled coil steel Natural Gas and Natural Gas Liquids (NGL) [Member] Natural gas Fuel [Member] Ultra-low-sulfur diesel fuel This member represents zinc. Zinc [Member] Zinc Position [Axis] Position [Axis] Position [Domain] Position [Domain] Long [Member] Long Derivative, Notional Amount Notional Amount Derivative, Nonmonetary Notional Amount, Mass Derivative, nonmonetary notional amount, mass Derivative, Nonmonetary Notional Amount, Energy Measure Derivative, nonmonetary notional amount, energy measure Derivative, Nonmonetary Notional Amount, Volume Derivative, nonmonetary notional amount, volume measure Currency [Axis] All Currencies [Domain] Canada, Dollars Canadian dollar China, Yuan Renminbi Chinese yuan Euro Member Countries, Euro Euro Derivative, Fixed Interest Rate Swapped Interest Rate Derivative, Cash Received on Hedge Settlement Amount Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Senior Unsecured Notes 5.00 Percent Due 2044 [Member] Senior Unsecured Notes 5.00 Percent Due 2044 [Member] Senior Unsecured Notes 5.00% Due 2044 Long-Term Debt, Type [Axis] Long-Term Debt, Type [Domain] Senior Notes [Member] Senior Notes Debt Instrument, Interest Rate, Stated Percentage Stated rate Fair Value, Recurring and Nonrecurring [Table] Measurement Basis [Axis] Portion at Fair Value Measurement [Member] Reported Value Measurement [Member] Carrying Value Estimate of Fair Value Measurement [Member] Estimated fair value Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value, Inputs, Level 1 [Member] Level 1 Fair Value, Inputs, Level 2 [Member] Level 2 Fair Value, Inputs, Level 3 [Member] Level 3 Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] FAIR VALUE MEASUREMENTS Fair value of deferred compensation investments include mutual funds invested in debt and equity securities held in the Valmont Deferred Compensation Plan. Quoted market prices are available for these securities in an active market. Deferred Compensation Investments, Fair Value Disclosure Deferred compensation investments Fair value portion of cash and cash equivalents, mutual funds. Cash and Cash Equivalents, Mutual Funds, Fair Value Disclosure Cash and cash equivalents-mutual funds Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Net earnings (loss) attributable to Valmont Industries, Inc. Net Income (Loss) Available to Common Stockholders, Basic Net earnings (loss) attributable to Valmont Industries, Inc. including change in redemption value of redeemable noncontrolling interests Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Weighted average shares outstanding (in thousands): Weighted Average Number of Shares Outstanding, Basic Basic (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Dilutive effect of various stock awards (in shares) Weighted Average Number of Shares Outstanding, Diluted Diluted (in shares) Earnings Per Share, Basic [Abstract] Net earnings attributable to Valmont Industries, Inc. per share: The per share amount resulting from the "as if" assumption that stock options were exercised for purposes of computing the dilutive effect of convertible securities. Earnings Per Share, Dilutive Securities, Stock Options, Per Share Dilutive effect of various stock awards (in dollars per share) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Outstanding stock options with exercise prices exceeding the market price of common stock, excluded from the computation of diluted earnings per share (in shares) Effective Income Tax Rate Reconciliation, Percent Effective tax rate Amount of income tax benefit recognized on deemed liquidation of a former business upon completion of a reorganization. Reorganization, Income Tax Benefit Recognized On Deemed Liquidation Federal income tax benefit recognized Share-Based Payment Arrangement, Expense Stock-based compensation Share-Based Payment Arrangement, Expense, Tax Benefit Income tax benefits Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Award Type [Axis] All Award Types Award Type [Domain] Restricted Stock [Member] Restricted Stock Units Performance Shares [Member] Performance Stock Units Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Stock Based Compensation Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Shares granted Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Weighted average grant date price Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax Foreign currency translation adjustments AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax Hedging activities Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax Defined benefit pension plan Share Repurchase Program, Authorized, Amount Authorized amount Share Repurchase Program, Remaining Authorized, Amount Directors increased the amount remaining under the program Amount of outstanding confirmed supplier finance obligation. Supplier Finance Program, Confirmed Obligations Outstanding Outstanding payment obligations Loss Contingencies [Table] Litigation Case [Axis] Litigation Case [Domain] Litigation matters related to its operations in the Agriculture market in Brazil. Brazilian Case [Member] Brazilian case Loss Contingencies [Line Items] CONTINGENCIES Litigation Settlement, Amount Awarded to Other Party Litigation settlement amount Loss Contingency Accrual Accrued amount Indicates the Section 232 tariff rate applied to steel products that meet U.S. steel sourcing requirements, resulting in application of the reduced ad valorem rate. Section 232 Preferential Rate Section 232 preferential rate Minimum percentage of content subject to higher tariff rates. Percentage of Content Subject To Higher Tariff Rates Minimum percentage of content subject to higher tariff rates Expected maximum tariff rate on full value. Maximum Tariff Rate on Full Value Maximum tariff rate on full value Expected tariff rate. Expected Tariff Rate Expected tariff rate Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Operating Segments [Member] Operating segment Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Unallocated corporate segment Intersegment Eliminations [Member] Intersegment Corporate Segment [Member] Corporate Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] North America [Member] North America International [Member] International [Member] International Represents information pertaining to North America utility product line. North America Utility Product Line [Member] North America Utility Represents information pertaining to North America lighting and transportation product line. North America Lighting And Transportation Product Line [Member] North America Lighting and Transportation Represents information pertaining to North America coatings product line. North America Coatings Product Line [Member] North America Coatings Represents information pertaining to North America telecommunications product line. North America Telecommunications Product Line [Member] North America Telecommunications Represents information pertaining to International infrastructure and solar coatings product line. International Infrastructure And Solar Product Line [Member] International Infrastructure and Solar Represents information pertaining to agriculture product line. Agriculture Product Line [Member] Agriculture Segment Reporting Information [Line Items] BUSINESS SEGMENTS AND RELATED REVENUE INFORMATION Indicates whether the number of reportable segments has not been disclosed, despite the presence of segment-related facts in the filing. This flag is used to identify potential omissions in segment reporting. Number Of Reportable Segments Not Disclosed Flag Number of reportable segments not disclosed flag Goodwill and Intangible Asset Impairment Impairment of long-lived assets Segment, Expenditure, Addition to Long-Lived Assets Total capital expenditures