Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Trading Arrangement: Trading Arrangement [Axis] Maximum High Maximum [Member] Title of 12(b) Security Title of 12(b) Security Derivative Instruments, Gain (Loss) by Hedging Relationship, by Income Statement Location, by Derivative Instrument Risk [Table] Derivative Instruments, Gain (Loss) [Table] Adjustment to Compensation, Amount Adjustment to Compensation Amount Schedule of Unrecognized Tax Benefits Roll Forward Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] Segment Reporting [Abstract] Segment Reporting [Abstract] Estimated future amortization expense of intangible assets Intangible Asset, Finite-Lived, and Capitalized Cost, Software to be Sold, Leased, or Marketed, Estimated Amortization Expense [Table Text Block] Schedule of Entity-Wide Information, Revenue from External Customers by Products and Services [Table] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Table] State and local income tax, net of federal income tax Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Finance Leases Lessee, Finance Leases [Text Block] Deferred: Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Energy Floating Rate Energy Floating Rate Energy Floating Rate Workers' compensation and general liability insurance Accrued Insurance, Current 2027 Finance Lease, Liability, to be Paid, Year One Reclassification of share-based liability awards APIC, Share-Based Payment Arrangement, Restricted Stock Unit, Increase for Cost Recognition Derivative Instrument [Axis] Derivative Instrument [Axis] Current taxes Current Income Tax Expense (Benefit) Poland POLAND Additions, Charged to Other Accounts SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Other Account Average purchase price (in dollars per share) Shares Acquired, Average Cost Per Share Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Developed technologies Developed Technology Rights [Member] Thereafter Lessee, Operating Lease, Liability, to be Paid, after Year Five Percent Effective Income Tax Rate Reconciliation, Percent [Abstract] Purchase discount from market price Share-Based Compensation Arrangement by Share-Based Payment Award, Discount from Market Price, Offering Date Property, plant and equipment Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment Other Deferred Tax Liabilities, Other Tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Percent [Abstract] Foley Products Company LLC Foley Products Company LLC [Member] Foley Products Company LLC Leases [Abstract] Other comprehensive income (loss), net of income taxes: Other Comprehensive Income (Loss), Net of Tax [Abstract] Other foreign jurisdictions Foreign rate differential Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount Leases Short-Term Leases [Policy Text Block] Maximum number of shares per employee Share-Based Compensation Arrangement by Share-Based Payment Award, Maximum Number of Shares Per Employee Common stock, par value Common Stock, Par or Stated Value Per Share Cash paid for amounts included in the measurement of lease liabilities: Cash Flow, Leases [Abstract] Cash Flow, Leases Intangible assets, net Intangible Asset, Excluding Goodwill, after Accumulated Amortization Equivalent number of awards outstanding (in shares) Outstanding number, beginning balance (in shares) Outstanding number, ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Foreign Deferred Foreign Income Tax Expense (Benefit) Retirement Benefits [Abstract] Retirement Benefits [Abstract] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Number of reporting segments Number of Reportable Segments Total current liabilities Liabilities, Current Property, Plant and Equipment Property, Plant and Equipment, Impairment [Policy Text Block] Customer Relationships Customer Relationships [Member] Commodity Contract Commitments Schedule of Derivative Instruments [Table Text Block] Business Combination, Acquisition-Related Cost, Adjustment Business Combination, Acquisition-Related Cost, Adjustment Business Combination, Acquisition-Related Cost, Adjustment Cash Flow Hedge Gain (Loss) to be Reclassified within 12 Months Cash Flow Hedge Gain (Loss) to be Reclassified within 12 Months Entity Address, City or Town Entity Address, City or Town Effect of cross-border tax laws Effective Income Tax Rate Reconciliation, Cross-Border Tax Effect, Percent Granted, number (in shares) Restricted stock awards and performance stock units, granted, (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Earnings before income taxes Income (Loss), Including Portion Attributable to Noncontrolling Interest, before Tax Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Total lease liabilities Lease Liability Lease Liability Total awards granted Stock Based Awards Granted [Table Text Block] Tabular disclosure of quantity granted under stock option or other equity-based compensation plan. Utilities Accrued Utilities Net Intangible Asset, Finite-Lived, after Accumulated Amortization Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Significant Other Observable Inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Total other comprehensive income (loss), net of income taxes Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] United States UNITED STATES Concentration Risk Type [Axis] Concentration Risk Type [Axis] Net other comprehensive income (loss) on derivatives Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Debt Instrument [Table] Schedule of Long-Term Debt Instruments [Table] Summary of certain financial information from continuing operations by reportable segment Segment Reporting [Table Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] 2035 Notes Six Point Zero Zero Percent, Notes Due Twenty Thirty Five [Member] Six Point Zero Zero Percent, Notes Due Twenty Thirty Five Maturity of Operating Lease Liabilities Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] Document Period End Date Document Period End Date Net gain Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax Award vesting frequency Share based Compensation Arrangement By Share based Payment Award Vesting Frequency Frequency of vesting of share-based compensation awards. Preferred stock, shares outstanding (shares) Preferred Stock, Shares Outstanding Debt instrument, face amount Debt Instrument, Face Amount 2028 Lessee, Operating Lease, Liability, to be Paid, Year Two Earnings per share: Earnings Per Share, Basic [Abstract] Earnings Per Share, Basic [Abstract] Commodity Commodity [Member] Debt Instrument, Covenant [Domain] Debt Instrument, Covenant [Domain] Debt Instrument, Covenant [Domain] Proceeds from Noncontrolling Interests Proceeds from Noncontrolling Interests Net operating losses and credits Deferred Tax Assets, Operating Loss Carryforwards Position [Axis] Position [Axis] Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Income Tax Paid, Federal, after Refund Received Income Tax Paid, Federal, after Refund Received Finance leases, remaining term Finance Lease, Weighted Average Remaining Lease Term Fair value of shares vested Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Consolidation Items [Domain] Consolidation Items [Domain] Other Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Actual (loss) return on plan assets Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) Current Operating Lease, Liability, Current EARNINGS PER SHARE Earnings Per Share [Text Block] Earnings Per Share [Abstract] Earnings Per Share [Abstract] Performance Condition [Axis] Performance Condition [Axis] Performance Condition [Axis] Document Fiscal Period Focus Document Fiscal Period Focus Entity-Wide Information, Revenue from External Customer [Line Items] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items] Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Net sales by major product Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Table Text Block] Total liabilities Liabilities Trading Symbol Trading Symbol Capital expenditures Payments to Acquire Property, Plant, and Equipment Unrecognized Tax Benefits [Roll Forward] Unrecognized Tax Benefits [Roll Forward] Other Other Product [Member] Other. Measurement Period Adjustment, Total assets acquired and liabilities assumed Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred Business Combination, Recognized Asset Acquired and Liability Assumed Business Combination, Recognized Asset Acquired and Liability Assumed [Table Text Block] Company Selected Measure Name Company Selected Measure Name Sale of Stock [Domain] Sale of Stock [Domain] Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Other tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount 2033 Notes Five Point Seven Fixe Zero Percent, Notes Due Twenty Thirty Three [Member] Five Point Seven Fixe Zero Percent, Notes Due Twenty Thirty Three Earnings Per Share, Diluted [Abstract] Earnings Per Share, Diluted [Abstract] Withholding tax Effective Income Tax Rate Reconciliation, Withholding Tax, Percent Effective Income Tax Rate Reconciliation, Withholding Tax, Percent Changes in unrecognized tax benefits Effective Income Tax Rate Reconciliation, Tax Contingency, Percent Credit Facility [Domain] Credit Facility [Domain] Cash flows from (used by) operating activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Foreign Income (Loss) from Continuing Operations before Income Taxes, Foreign Cash dividends per share (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Estimated useful lives Property, Plant, and Equipment, Useful Life Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] 2028 Finance Lease, Liability, to be Paid, Year Two Litigation-related reserve Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Legal Settlements Other Deferred Tax Assets, Other 2030 Finance Lease, Liability, to be Paid, Year Four Deferred income taxes and other long-term taxes Deferred Income Taxes and Tax Credits Net operating losses carry forward Operating Loss Carryforwards Business Combination, Goodwill, Expected Tax Deductible, Amount Business Combination, Goodwill, Expected Tax Deductible, Amount Committed financing fees Payment For Committed Financing Fees Payment For Committed Financing Fees Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Maximum borrowing capacity Line of Credit Facility, Current Borrowing Capacity Land improvements Land Improvements [Member] Less imputed interest Finance Lease, Liability, Undiscounted Excess Amount Other Other Intangible Assets [Member] Other operating assets and liabilities Increase (Decrease) in Other Operating Assets and Liabilities, Net Operating cash outflows from operating leases Operating Lease, Payments Variable and short-term lease expense Variable and Short-term Lease cost Variable and Short-term Lease cost Deferred tax assets: Components of Deferred Tax Assets [Abstract] Award Timing Predetermined Award Timing Predetermined [Flag] Accrued interest and penalties Income Tax Examination, Penalties and Interest Accrued Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Stock-based compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Quoted Prices in Active Markets for Identical Assets (Level 1) Fair Value, Inputs, Level 1 [Member] Internal-use software Software, Internally Developed [Member] Effective income tax rate Effective income tax rate Effective Income Tax Rate Reconciliation, Percent IRC Section 50(c)(1) - basis adjustment Effective Income Tax Rate Reconciliation, Investment Credit, Basis Adjustment, Percent Effective Income Tax Rate Reconciliation, Investment Credit, Basis Adjustment, Percent Effect of dilutive securities (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Construction Solutions Group Construction Solutions Group [Member] Construction Solutions Group Net earnings Net earnings Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Accumulated impairment: Goodwill, Impaired [Abstract] Net actuarial gain arising during measurement period Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax Preferred stock, par value per share (in USD per share) Preferred Stock, Par or Stated Value Per Share Deferred compensation and employee benefits Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits Poland Program Poland Program [Member] Poland Program [Member] Operating assets Operating Lease, Right-of-Use Asset Concentration Risk Type [Domain] Concentration Risk Type [Domain] Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Net actuarial loss Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax Less current maturities of long-term debt Long-Term Debt and Lease Obligation, Current Revolving line of credit outstanding amount Long-Term Line of Credit Dividends Payments of Ordinary Dividends, Common Stock Reserves and other accrued expenses Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other Expiration Date Trading Arrangement Expiration Date Foreign Current Foreign Tax Expense (Benefit) 2030 Long-Term Debt, Maturity, Year Four State and local Current State and Local Tax Expense (Benefit) Money market investments Cash and Cash Equivalents, Fair Value Disclosure Total stockholders' equity Beginning balance Ending balance Equity, Including Portion Attributable to Noncontrolling Interest Buildings Building [Member] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Derivative [Table] Derivative [Table] Accounts receivable Business Combination, Recognized Asset Acquired, Receivable, Current Cash flows from (used by) investing activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Entity Voluntary Filers Entity Voluntary Filers ROU operating lease liabilities Deferred Tax Assets, Right-of-use Operating Lease Liabilities Deferred Tax Assets, Right-of-use Operating Lease Liabilities Pro forma net earnings Business Combination, Pro Forma Information, Pro Forma Income (Loss), after Tax Total unrecognized compensation cost Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Document Financial Statement Error Correction [Flag] Document Financial Statement Error Correction [Flag] Segments [Domain] Segments [Domain] CREDIT ARRANGEMENTS Debt Disclosure [Text Block] Less unamortized debt issuance costs Debt issuance costs Less unamortized debt issuance costs Debt Issuance Costs, Net Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] Business Combination [Table] Business Combination [Table] Europe Steel Group Europe Steel Group [Member] Europe Steel Group PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] Accounts payable Accounts Payable, Trade, Current Government Assistance, Type [Axis] Government Assistance, Type [Axis] Buildings and improvements Buildings and Improvements, Gross Net costs and operating expenses Costs and Expenses Thereafter Long-Term Debt, Maturity, after Year Five Finance leases, weighted average discount rate Finance Lease, Weighted Average Discount Rate, Percent Interest rate Debt Instrument, Interest Rate, Stated Percentage Cash dividends Dividends, Common Stock, Cash Stockholders' equity Equity, Attributable to Parent Other noncurrent assets Business Combination, Recognized Asset Acquired, Other Asset, Noncurrent Number Of Electric Arc Furnace Mini Mills Number Of Electric Arc Furnace Mini Mills Number Of Electric Arc Furnace Mini Mills Assets Assets [Abstract] CERCLA sites CERCLA sites [Member] CERCLA sites [Member] Goodwill, gross: Goodwill, Gross [Abstract] Goodwill, Gross Research and development credit Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount Insider Trading Policies and Procedures [Line Items] Acquisition adjustments Goodwill, Measurement Period Adjustment Allowance for doubtful accounts Accounts Receivable, Allowance for Credit Loss, Current Performance Awards Performance Shares [Member] Prepaid and other current assets Prepaid Expense and Other Assets, Current Deferred taxes Deferred Income Tax Expense (Benefit) Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Number of rerolling mills Number Of Rerolling Mills Number Of Rerolling Mills Other non-deductible items Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items] Changes in the carrying amount of goodwill Goodwill [Table Text Block] Auditor Location Auditor Location Goodwill, beginning Goodwill, ending Goodwill, Gross Entity Central Index Key Entity Central Index Key Less accumulated depreciation and amortization Property, Plant, and Equipment, Accumulated Depreciation, Depletion, and Amortization Additional paid-in capital Additional Paid in Capital, Common Stock Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] U.S. federal statutory income tax rate Income tax expense at statutory rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Other comprehensive income (loss) before reclassifications Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Audit Information [Abstract] Audit Information Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Long-term Finance Lease, Liability, Noncurrent Reportable Segments Total Reportable Segment, Aggregation before Other Operating Segment [Member] Amount Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract] Number Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] Other current assets Business Combination, Recognized Asset Acquired, Other Asset, Current Environmental Loss Contingency, Noncurrent, Statement of Financial Position [Extensible Enumeration] Environmental Loss Contingency, Noncurrent, Statement of Financial Position [Extensible Enumeration] Total lease payments Finance Lease, Liability, to be Paid Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] All Individuals All Individuals [Member] External net sales from continuing operations by geographic area Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue [Table Text Block] Balance at Beginning of Period Balance at End of Period SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount Inventory, Finished Goods, Net of Reserves Inventory, Finished Goods, Net of Reserves Period of unrecognized compensation to be recognized Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Contingencies Commitments and Contingencies, Policy [Policy Text Block] Lease not yet commenced, term Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract Statement [Line Items] Statement [Line Items] Total assets Assets Assets Defined Benefit Plan [Table] Defined Benefit Plan [Table] Energy contract commitments Derivative, Nonmonetary Notional Amount, Energy Measure Operating Leases Lessee, Operating Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract] Copper Copper [Member] Copper. Interest expense Interest expense Interest Expense, Operating Tax effects of significant temporary differences giving rise to deferred tax assets and liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Fair value of plan assets at beginning of year Fair value of plan assets at end of year Fair value of plan assets Defined Benefit Plan, Plan Assets, Amount Derivatives Deferred Tax Liabilities, Derivatives Segments Operating Segments [Member] STOCK-BASED COMPENSATION PLANS Share-Based Payment Arrangement [Text Block] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Other foreign jurisdictions Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent PEO PEO [Member] 2028 Long-Term Debt, Maturity, Year Two Other States Other States [Member] Other States Other noncurrent liabilities Other Liabilities, Noncurrent Goodwill Goodwill Beginning balance, Goodwill, net Ending balance, Goodwill, net Goodwill Retirement Plan Type [Axis] Retirement Plan Type [Axis] Fixed income securities Fixed Income Securities [Member] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Accounts payable Business Combination, Recognized Liability Assumed, Accounts Payable, Current Thereafter Finance Lease, Liability, to be Paid, after Year Five Changes in unrecognized tax benefits Effective Income Tax Rate Reconciliation, Tax Contingency, Amount Long-term Operating Lease, Liability, Noncurrent Retained Earnings Retained Earnings [Member] Revolving credit agreement Revolving Credit Facility [Member] Fair Value Fair Value Measurement, Policy [Policy Text Block] Common stock, shares outstanding Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Foreign Currency Translation Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Diluted (in shares) Earnings Per Share, Diluted Maximum debt to capitalization ratio Maximum Debt to Capitalization Ratio It represents maximum debt to capitalization ratio stated in the debt covenant. Interest costs capitalized Interest Costs Capitalized Stockholders' Equity Note [Abstract] Stockholders' Equity Note [Abstract] Intangible Asset, Finite-Lived [Line Items] Intangible Asset, Finite-Lived [Line Items] Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Amortization Expense Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Amortization Expense Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Amortization Expense Cash and other Defined Benefit Plan, Cash [Member] Natural Gas Natural Gas [Member] Intangible Asset, Finite-Lived, Acquired Intangible Asset, Finite-Lived, Acquired Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Share-Based Payment Arrangement [Abstract] Lease rights Lease Agreements [Member] Property, plant and equipment Deferred Tax Liabilities, Property, Plant and Equipment Contract as percent of total segment revenue (percent) Contract with Customer, Contract as Percent of Total Revenue Contract with Customer, Contract as Percent of Total Revenue Debt Instrument, Covenant [Axis] Debt Instrument, Covenant [Axis] Debt Instrument, Covenant Reclassification for settlement losses and other Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax North America Segment North America Segment [Member] North America Segment Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] State and local income tax, net of federal income tax State and local taxes Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Write-off of committed financing fees Write-Off Of Committed Financing Fees Write-Off Of Committed Financing Fees Deductions, Charged to Cost and Expense Valuation Allowances and Reserves, Deductions, Charged to Cost and Expense Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to costs and expenses in a given period. Scheduled maturities of the Company's long-term debt Schedule of Maturities of Long-Term Debt [Table Text Block] Other non-deductible items Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Percent Sale of Stock [Axis] Sale of Stock [Axis] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area [Abstract] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area [Abstract] ACCRUED EXPENSES AND OTHER PAYABLES Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block] Weighted average interest rate Long-Term Debt, Weighted Average Interest Rate, at Point in Time Foreign Income Tax Jurisdiction, Foreign [Member] Auditor Firm ID Auditor Firm ID Next five years Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years Remaining performance obligation Revenue, Remaining Performance Obligation, Amount Income Tax Paid, Foreign, after Refund Received Income Tax Paid, Foreign, after Refund Received Maturity of Finance Lease Liabilities Finance Lease, Liability, to be Paid, Maturity [Table Text Block] Nontaxable or non-deductible items: Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount [Abstract] Total leased assets Right of Use Asset Right of Use Asset Proceeds from issuance of debt Proceeds from Issuance of Debt TCJA - Toll charge and related foreign tax credits Effective Income Tax Rate Reconciliation, Toll Charge and Related Foreign Tax Credits Effective Income Tax Rate Reconciliation, Toll Charge and Related Foreign Tax Credits Percentage of accounts receivable secured by credit insurance or letters of credit Percentage of Secured Accounts Receivable Ratio of secured accounts receivable to total accounts receivable, expressed as a percentage. Derivatives: Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax [Abstract] ACQUISITION Business Combination [Text Block] 2031 Defined Benefit Plan, Expected Future Benefit Payment, Year Five Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Equipment Machinery and Equipment, Gross Asset impairments Asset, Impairment Loss Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Common stock, shares issued Beginning balance, shares Ending balance, shares Common Stock, Shares, Issued Series 2022 Bonds, due 2047 Series 2022 Bonds, Due 2047 [Member] Series 2022 Bonds, Due 2047 ACCUMULATED OTHER COMPREHENSIVE LOSS Comprehensive Income (Loss) Note [Text Block] Accounts receivable Increase (Decrease) in Accounts Receivable Product and Service [Domain] Product and Service [Domain] California CALIFORNIA Proceeds from government assistance related to property, plant and equipment Proceeds From Government Grants Related To Property, Plant And Equipment Proceeds From Government Grants Related To Property, Plant And Equipment Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Metric period Share-based Compensation Arrangement By Share-Based Payment Award, Metric Period Share-based Compensation Arrangement By Share-Based Payment Award, Metric Period Deferred tax valuation allowance SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member] Deferred income taxes Deferred Income Tax Liabilities, Net Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Gain (loss) before taxes for derivatives not designated as hedging instruments Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net Compensation expense under defined contribution profit sharing and savings plan and BRP Plan Defined Contribution Plan, Cost 2029 Lessee, Operating Lease, Liability, to be Paid, Year Three Termination Date Trading Arrangement Termination Date Measurement Period Adjustment, Inventories Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Inventory Relative total stockholder return Relative Total Shareholder Return [Member] Relative Total Shareholder Return [Member] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] U.S. federal statutory income tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Net other comprehensive income on defined benefit pension plans Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Goodwill, net: Goodwill, Net [Abstract] Goodwill, Net Entity Public Float Entity Public Float Fair Value as of Grant Date Award Grant Date Fair Value Defined Benefit Plan, Plan Assets, Category [Axis] Defined Benefit Plan, Plan Assets, Category [Axis] Net loss (gain) on sales of assets Gain (Loss) on Disposition of Assets Goodwill [Table] Goodwill [Table] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Arrangement Duration Trading Arrangement Duration Consolidation Items [Axis] Consolidation Items [Axis] Intangible Asset, Indefinite-Lived, Acquired [Table] Intangible Asset, Indefinite-Lived, Acquired [Table] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Income taxes (benefit) included in the consolidated statements of operations Component of income tax benefit [Table Text Block] Tabular disclosure of the components of income tax expense in the consolidated statements of operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Fair value of U.K. Pension Plan assets Defined Benefit Plan, Plan Assets,Net Defined Benefit Plan, Plan Assets,Net Gross Carrying Amount Intangible Asset, Finite-Lived, before Accumulated Amortization Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Nontaxable gain Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount Accounts payable, accrued expenses and other payables Increase (Decrease) in Accounts Payable and Accrued Liabilities Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Amortization of assets Finance Lease, Right-of-Use Asset, Amortization Other Other Geographical Areas [Member] Other Geographical Areas Business Combination, Provisional Information, initial Accounting Incomplete, Adjustment, Interest Expense Business Combination, Provisional Information, initial Accounting Incomplete, Adjustment, Interest Expense Business Combination, Provisional Information, initial Accounting Incomplete, Adjustment, Interest Expense Goodwill [Roll Forward] Goodwill [Roll Forward] Intangible Asset, Finite-Lived, Class [Domain] Intangible Asset, Finite-Lived, Class [Domain] Trade names Trade Names [Member] Financial assets and financial liabilities measured at fair value on a recurring basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Award Type [Domain] Award Type [Domain] Nontaxable or non-deductible items: Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent [Abstract] Interest on lease liabilities Finance Lease, Interest Expense FAIR VALUE Fair Value Disclosures [Text Block] Benefits paid Defined Benefit Plan, Plan Assets, Benefits Paid Significant Unobservable Inputs (Level 3) Fair Value, Inputs, Level 3 [Member] Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Depreciation Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Depreciation Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Depreciation Reductions due to lapse of statute of limitations Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations 2027 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year One Treasury stock acquired (in shares) Treasury stock acquired (in shares) Treasury Stock, Shares, Acquired Price per share (in dollars per share) Share Price Geographical [Axis] Geographical [Axis] Restricted cash Restricted Cash Cash and cash equivalents Cash and cash equivalents Cash, Cash Equivalents, and Short-Term Investments Downstream products Downstream Products [Member] Downstream Products Retirement Plan Name [Domain] Retirement Plan Name [Domain] Legal Entity [Axis] Legal Entity [Axis] Steel products Steel Products [Member] Steel products. Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Treasury stock acquired and excise tax Treasury Stock, Value, Acquired, Cost Method Stock-Based Compensation Postemployment Benefit Plans, Policy [Policy Text Block] Cash, restricted cash and cash equivalents at beginning of period Cash, restricted cash and cash equivalents at end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Customer relationships Customer Lists [Member] Intangible Asset, Finite-Lived [Table] Intangible Asset, Finite-Lived [Table] Tensar Tensar [Member] Tensar Non-NEOs Non-NEOs [Member] Ground stabilization solutions Ground Stabilization Products [Member] Ground Stabilization Products Reporting Unit [Domain] Reporting Unit [Domain] 2027 Defined Benefit Plan, Expected Future Benefit Payment, Year One 2028 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Two Georgia GEORGIA Schedule of Inventory, Current Schedule of Inventory, Current [Table Text Block] Operating Leases Lessee, Operating Leases [Text Block] 2027 Long-Term Debt, Maturity, Year One Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Raw materials Inventory, Raw Materials, Gross Contract liabilities (included in other accrued expenses and payables) Contract with Customer, Liability, Current Treasury stock acquired Payments for Repurchase of Common Stock Series 2025 Bonds, Due 2032 Series 2025 Bonds, Due 2032 [Member] Series 2025 Bonds, Due 2032 Range [Axis] Statistical Measurement [Axis] Schedule of Balance Sheet Components of Leases Schedule of Balance Sheet Components of Leases [Table Text Block] Schedule of Balance Sheet Components of Leases Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Agreement For Performance Based Principal Reduction Loan Agreement For Performance Based Principal Reduction Loan Agreement For Performance Based Principal Reduction Loan Award Type [Axis] Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Retained earnings Retained Earnings (Accumulated Deficit) Florida FLORIDA Product and Service [Axis] Product and Service [Axis] Personal Property Personal Property [Member] Personal Property Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common Stock Common Stock [Member] Operating lease expense Operating Lease, Cost Derivative Contract Type [Domain] Derivative Contract [Domain] Derivative Contract [Domain] Allowance for Doubtful Accounts Receivable [Policy Text Block] Foreign currency translation Goodwill, Foreign Currency Translation, Gain (Loss) Other: Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount [Abstract] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Business Combination, Number of Businesses Acquired Business Combination, Number of Businesses Acquired Total liabilities and stockholders' equity Liabilities and Equity Salaries and incentive compensation Accrued Salaries, Current Employee Stock Option Share-Based Payment Arrangement, Option [Member] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Table] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Table] Stockholders' equity attributable to non-controlling interests Equity, Attributable to Noncontrolling Interest Schedule of Weighted-average Assumptions Used Defined Benefit Plan, Assumptions [Table Text Block] BRP plan Supplemental Employee Retirement Plan [Member] Percentage that performance targets are weighted Percentage, Performance Target Weighted It represents the percentage that performance target are weighted and evaluated. Business Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Tabular List, Table Tabular List [Table Text Block] SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] 2029 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Three Name Awards Close in Time to MNPI Disclosures, Individual Name Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Property, Plant and Equipment, Type [Domain] Long-Lived Asset, Class [Domain] Settlement of New Markets Tax Credit transactions Settlement of New Markets Tax Credit Transaction Settlement of New Markets Tax Credit Transaction Schedule of Property, Plant and Equipment [Table] Property, Plant, and Equipment [Table] Adjustment to Compensation: Adjustment to Compensation [Axis] Reclassifications for (gain) loss and other Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Schedule of Allocation of Plan Assets Schedule of Allocation of Plan Assets [Table Text Block] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activity Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Cost Of Goods Sold Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Cost Of Goods Sold Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Cost Of Goods Sold Credit Facility [Axis] Credit Facility [Axis] SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS AND RESERVES SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] Long-term debt Long-term debt Long-Term Debt and Lease Obligation 2031 Finance Lease, Liability, to be Paid, Year Five Name Measure Name Illinois ILLINOIS Pay vs Performance Disclosure [Line Items] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Deferred tax liabilities: Components of Deferred Tax Liabilities [Abstract] Debt Instrument [Line Items] Debt Instrument [Line Items] Corporate and Other Corporate Segment and Other Operating Segment [Member] United States Income (Loss) from Continuing Operations before Income Taxes, Domestic Additional Paid-In Capital Additional Paid-in Capital [Member] Indefinite-lived Intangible Assets [Axis] Intangible Asset, Indefinite-Lived, Class [Axis] Proceeds From Performance Based Principal Reduction Loan Proceeds From Performance Based Principal Reduction Loan Proceeds From Performance Based Principal Reduction Loan Name Trading Arrangement, Individual Name Position [Domain] Position [Domain] Company Selected Measure Amount Company Selected Measure Amount Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Asset, Current Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Asset, Current Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Asset, Current Income tax receivable Income Taxes Receivable Depreciation and amortization Depreciation and amortization Depreciation, Depletion and Amortization Pension assets, target allocation (percent) Defined Benefit Plan, Plan Assets, Target Allocation, Percentage Issuance of stock under incentive and purchase plans, net of forfeitures, shares Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Retirement Plan Name [Axis] Retirement Plan Name [Axis] Finance leases Right-of-Use Asset Obtained in Exchange for Finance Lease Liability 2031 Long-Term Debt, Maturity, Year Five West Virginia Economic Development Authority West Virginia Economic Development Authority [Member] West Virginia Economic Development Authority Operating leases, remaining term Operating Lease, Weighted Average Remaining Lease Term Non-PEO NEO Non-PEO NEO [Member] Segment Eliminations Segment Eliminations [Member] Segment Eliminations Cost of goods sold Cost of Product and Service Sold SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] Award Timing Method Award Timing Method [Text Block] Increase (decrease) in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Deferred tax assets, net Deferred Tax Assets, Net of Valuation Allowance Total deferred tax assets Deferred Tax Assets, Gross Amortization of unrecognized net actuarial loss Defined Benefit Plan, Amortization of Gain (Loss) Net earnings Net Income (Loss) Attributable to Parent Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Location, Statement of Financial Position, Balance [Axis] Location, Statement of Financial Position, Balance [Axis] Proceeds from the sale of property, plant and equipment Proceeds from Sale of Property, Plant, and Equipment 2030 Defined Benefit Plan, Expected Future Benefit Payment, Year Four Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Restatement Determination Date: Restatement Determination Date [Axis] Schedule of accumulated other comprehensive income (loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Plus unamortized bond premium Debt Instrument, Unamortized Premium Litigation settlement, amount awarded to other party Litigation Settlement, Amount Awarded to Other Party Actuarial gain Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Payout percentage Payout percentage Payout percentage of a targeted amount. Measurement Period Adjustment, Property, plant and equipment Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment Non-deductible compensation Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Amount Short-term borrowings 4.570% Short-Term Borrowings [Member] 4.570% Short-Term Borrowings Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] New Jersey NEW JERSEY Range [Domain] Statistical Measurement [Domain] Document Fiscal Year Focus Document Fiscal Year Focus Remaining performance obligation, period of satisfaction Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Litigation expense Litigation Settlement, Loss Withholding tax Effective Income Tax Rate Reconciliation, Withholding Tax, Amount Effective Income Tax Rate Reconciliation, Withholding Tax, Amount Restricted stock units and performance stock units excluding the cash component Restricted Stock Awards And Psus excluding the cash component [Member] Restricted Stock Awards And PSUs excluding the cash component. Common stock, par value $0.01 per share; authorized 200,000,000 shares; issued 129,060,664 shares; outstanding 110,316,995 and 111,189,136 shares Common Stock, Value, Issued 2027 Lessee, Operating Lease, Liability, to be Paid, Year One Restricted stock units and performance stock units, excluding the cash component Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] Tax withholdings related to share settlements, net of purchase plans Payment, Tax Withholding, Share-Based Payment Arrangement Long-term debt, including the deferred gain from the termination of the interest rate swaps Schedule of Long-Term Debt Instruments [Table Text Block] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Recognized over Time Transferred over Time [Member] Line of Credit Line of Credit [Member] Restatement Determination Date Restatement Determination Date Tax Jurisdiction of Domicile [Extensible Enumeration] Tax Jurisdiction of Domicile [Extensible Enumeration] Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Write-down of inventory Inventory Write-down Reconciliation of the federal statutory rate to effective tax rate from continuing operations Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Amendment Flag Amendment Flag Goodwill [Line Items] Goodwill [Line Items] Current liabilities: Liabilities, Current [Abstract] Financing cash outflows from finance leases Finance Lease, Principal Payments Standby Letters of Credit Standby Letters of Credit [Member] Finance lease asset Finance Lease, Right-of-Use Asset, before Accumulated Amortization Precast products Precast Products [Member] Precast Products Loss Contingencies [Table] Loss Contingencies [Table] Foreign Exchange Foreign Exchange [Member] Timing of Transfer of Good or Service [Domain] Timing of Transfer of Good or Service [Domain] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] 2029 Defined Benefit Plan, Expected Future Benefit Payment, Year Three Property, plant and equipment: Property, Plant, and Equipment [Abstract] Entity Address, State or Province Entity Address, State or Province PEO Total Compensation Amount PEO Total Compensation Amount Tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Amount [Abstract] Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Capital expenditures Segment Reporting, Long-Lived Asset, Expenditure for Addition Share-based Compensation [Abstract] Share-Based Payment Arrangement, Noncash Expense [Abstract] Change for tax positions of prior years Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Income Tax Contingency [Line Items] Income Tax Contingency [Line Items] Derivative notional amount Derivative, Notional Amount Other comprehensive income (loss), net of income taxes: Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax [Abstract] Average basic shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Nine Qualitative Reporting Units Nine Qualitative Reporting Units [Member] Nine Qualitative Reporting Units Contract assets (included in accounts receivable) Contract with Customer, Asset, after Allowance for Credit Loss, Current Accumulated impairment loss, beginning Accumulated impairment loss, ending Goodwill, Impaired, Accumulated Impairment Loss Inventory Valuation Reserves Inventory Valuation Reserves SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] Loss Contingencies [Line Items] Loss Contingencies [Line Items] 2030 Lessee, Operating Lease, Liability, to be Paid, Year Four Finance lease liabilities: Finance lease expense: Lessee, Finance Lease, Description [Abstract] Operating lease liabilities: Lessor, Operating Lease, Description [Abstract] Net sales Revenue from Contract with Customer, Including Assessed Tax SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] Schedule of Cash Flow, Supplemental Disclosures Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] ROU operating lease assets Deferred Tax Liabilities, Intangible Assets1 Deferred Tax Liabilities, Intangible Assets1 ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accounts Payable, Accrued Expenses And Other Payables Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accounts Payable, Accrued Expenses And Other Payables Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accounts Payable, Accrued Expenses And Other Payables Foreign currency translation Goodwill, Gross, Foreign Currency Translation Gain (Loss) Goodwill, Gross, Foreign Currency Translation Gain (Loss) Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Vested, number (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Fabricated Product and Installation Services Fabricated Product and Installation Services [Member] Fabricated Product and Installation Services [Member] Accumulated Amortization Intangible Asset, Finite-Lived, Accumulated Amortization Capitalized research and development Deferred Tax Asset, In-Process Research and Development Indefinite-lived intangible assets acquired Intangible Asset, Indefinite-Lived, Acquired Revolving credit facility, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Proceeds from insurance Proceeds from Insurance Settlement, Investing Activities Current maturities of long-term debt Long-Term Debt, Current Maturities Less treasury stock, 18,743,669 and 17,871,528 shares at cost Treasury Stock, Value Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Liabilities related to additions of property, plant and equipment Capital Expenditures Incurred but Not yet Paid Other comprehensive income (loss), net unrealized holding gain, tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax Concrete Pipe And Precast, LLC Concrete Pipe And Precast, LLC [Member] Concrete Pipe And Precast, LLC Noncontrolling Interests Noncontrolling Interest [Member] Amortization of debt issuance costs Amortization of Debt Issuance Costs Unsecured Debt Unsecured Debt [Member] Significant accrued expenses and other payables Schedule of Accrued Liabilities [Table Text Block] Segment Reporting, Reconciliation [Abstract] Segment Reporting, Reconciliation [Abstract] Intangible assets Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill Poland Compensation Scheme Act Poland Compensation Scheme Act [Member] Poland Compensation Scheme Act Total long-term debt, excluding finance leases Long-Term Debt Changes in operating assets and liabilities, net of acquisitions: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Net cash flows used by investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Unrecognized Tax Benefits, Beginning Balance Unrecognized Tax Benefits, Ending Balance Unrecognized Tax Benefits CAPITAL STOCK Equity [Text Block] Costs and operating expenses: Costs and Expenses [Abstract] Security Exchange Name Security Exchange Name Foreign currency translation Goodwill, Impaired, Foreign Currency Translation Gain (Loss) Goodwill, Impaired, Foreign Currency Translation Gain (Loss) Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] Foreign currency translation Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) Shares subscribed (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Interest Interest Payable, Current Finance assets Finance Lease, Right-of-Use Asset, after Accumulated Amortization Estimated useful lives for depreciation and amortization Property, Plant, and Equipment [Table Text Block] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Pennsylvania PENNSYLVANIA Name Outstanding Recovery, Individual Name Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] State and local Deferred State and Local Income Tax Expense (Benefit) Yearly activity of the stock purchase plan Schedule of Share-Based Compensation, Employee Stock Purchase Plan, Activity [Table Text Block] Geographical [Domain] Geographical [Domain] Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Measurement Period Adjustment, Deferred income taxes Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Deferred Income Taxes Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Deferred Income Taxes Loss from litigation Gain (Loss) from Litigation Settlement Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract] Weighted Average Number of Shares Outstanding, Diluted, Adjustment [Abstract] Noncash activities: Noncash Investing and Financing Items [Abstract] Unrealized loss (gain) on undesignated commodity hedges Unrealized Gain (Loss) on Derivatives Defined Benefit Pension Plans Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Long-term debt, gross Long-Term Debt, Gross Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Lease Expense Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Lease Expense Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Lease Expense First Quantitative Reporting Unit First Quantitative Reporting Unit [Member] First Quantitative Reporting Unit Noncompete Agreements Noncompete Agreements [Member] Compensation Amount Outstanding Recovery Compensation Amount Individual: Individual [Axis] Average diluted shares outstanding (in shares) Average diluted shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Contract backlog Order or Production Backlog [Member] Entity Emerging Growth Company Entity Emerging Growth Company Derivative Financial Instruments Derivatives, Policy [Policy Text Block] Underlying Security Market Price Change Underlying Security Market Price Change, Percent DERIVATIVES Derivative Instruments and Hedging Activities Disclosure [Text Block] Real Property Real Property [Member] Real Property Less imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Non-deductible compensation Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Percent Derivative liability, before offset Derivative Liability, Subject to Master Netting Arrangement, before Offset Employer contributions Defined Benefit Plan, Plan Assets, Contributions by Employer Assets: Leased Assets [Abstract] Leased Assets Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] North America Steel Group North America Steel Group [Member] North America Steel Group Noncontrolling Interest, Increase From Contribution Noncontrolling Interest, Increase From Contribution Noncontrolling Interest, Increase From Contribution Effective discount rate for benefit obligations Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate United States Deferred Federal Income Tax Expense (Benefit) Customer Backlog Customer Backlog [Member] Customer Backlog Treasury Stock Treasury Stock, Common [Member] Operating Lease, Right-Of-Use Asset, Increase During Period Operating Lease, Right-Of-Use Asset, Increase During Period Operating Lease, Right-Of-Use Asset, Increase During Period Intangible Asset, Goodwill and Other [Abstract] Intangible Asset, Goodwill and Other [Abstract] Interest expense related to uncertain tax positions Effective Income Tax Rate Reconciliation, Interest Expense Related To Uncertain Tax Positions Effective Income Tax Rate Reconciliation, Interest Expense Related To Uncertain Tax Positions Stand by letters of credit outstanding amount Letters of Credit Outstanding, Amount Total debt Total debt Debt and Lease Obligation Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Indefinite-lived Intangible Assets, Major Class Name [Domain] Intangible Asset, Indefinite-Lived, Class [Domain] Total lease payments Lessee, Operating Lease, Liability, to be Paid Outstanding, weighted average grant-date fair value, beginning balance (in dollars per share) Outstanding, weighted average grant-date fair value, ending balance (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value ROU assets obtained in exchange for lease obligations: Right-of-use Assets Obtained in Exchange for Lease Obligations [Abstract] Right-of-use Assets Obtained in Exchange for Lease Obligations All Executive Categories All Executive Categories [Member] Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Schedule of Net Periodic Benefit Costs Schedule of Net Benefit Costs [Table Text Block] EBITDA EBITDA [Member] The Company's EBITDA [Member] Energy tax credits - 48C advanced energy project credit Effective Income Tax Rate Reconciliation, Tax Credit, Energy-Related, Amount Nontaxable gain Effective Income Tax Rate Reconciliation, Nondeductible Expense (Gain), Percent Effective Income Tax Rate Reconciliation, Nondeductible Expense (Gain), Percent Measurement Period Adjustments, Accounts receivable Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accounts Receivable Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accounts Receivable Defined benefit pension plans: Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax [Abstract] Calculations of basic and diluted earnings per share from continuing operations Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Debt Disclosure [Abstract] Debt Disclosure [Abstract] SEGMENT INFORMATION Segment Reporting [Text Block] Minimum Low Minimum [Member] Unrealized loss (gain) on undesignated commodity hedges Unrealized gain on undesignated commodity hedges Unrealized Gain (Loss) on Commodity Contracts Auditor Name Auditor Name Effect of exchange rate changes on cash Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Diluted earnings per share from continuing operations attributable to CMC (USD per share) Income (Loss) from Continuing Operations, Per Diluted Share Location, Statement of Income, Balance [Axis] Location, Statement of Income, Balance [Axis] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Other Other Debt [Member] Other Debt Goodwill and Other Intangible Assets Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Timing of Transfer of Good or Service [Axis] Timing of Transfer of Good or Service [Axis] Business Combination [Line Items] Business Combination [Line Items] Total net periodic benefit cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Transfer of accounts receivable program Transfer of Accounts Receivable Program, Face Amount Transfer of Accounts Receivable Program, Face Amount Actual interest coverage ratio Interest Coverage Ratio It represents actual interest coverage ratio for an applicable date. Common stock, shares authorized Common Stock, Shares Authorized Intangible Asset, Finite-Lived, Useful Life Intangible Asset, Finite-Lived, Useful Life Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Current value of segregated assets Deferred Compensation Plan Assets Intangibles and goodwill Deferred Tax Liabilities, Intangible Assets Exercise Price Award Exercise Price Segment Reporting [Line Items] Segment Reporting [Line Items] Share repurchase program, authorized amount Share Repurchase Program, Authorized, Amount Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] 2033 And 2035 Senior Unsecured Notes 2033 And 2035 Senior Unsecured Notes [Member] 2033 And 2035 Senior Unsecured Notes EMPLOYEES' RETIREMENT PLANS Compensation and Employee Benefit Plans [Text Block] Income tax payable (receivable) Increase (Decrease) in Income Taxes Payable, Net of Income Taxes Receivable Long-lived assets by geographic area Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Long-Lived Asset [Table Text Block] Repayments of long-term debt Repayments of Long-Term Debt Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Total AOCL Equity Component [Domain] Recognized in earnings Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings Foreign exchange Foreign Exchange Contract [Member] Adoption Date Trading Arrangement Adoption Date Inventories Inventory, Policy [Policy Text Block] Counterparty Name [Domain] Counterparty Name [Domain] 2031 Notes $300 Million Notes At 3.875% Due February 2031 [Member] $300 Million Notes At 3.875% Due February 2031 Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Total operating lease liabilities Total operating lease liabilities Operating Lease, Liability Total finance lease liabilities Total finance lease liabilities Finance leases Finance Lease, Liability Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Selling, general and administrative expenses Selling, general and administrative expenses Selling, General and Administrative Expense 2028 Defined Benefit Plan, Expected Future Benefit Payment, Year Two Liability awards Phantom Share Units (PSUs) [Member] Patents Patents [Member] Reasonably possible decrease of unrecognized tax benefits Decrease in Unrecognized Tax Benefits is Reasonably Possible Business Combination [Domain] Business Combination [Domain] Stand-by letters of credit Letter of Credit [Member] COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Construction in process Construction in Progress, Gross Restricted Stock Awards/Units Restricted stock units Restricted Stock Units (RSUs) [Member] Average Weighted Average [Member] All Adjustments to Compensation All Adjustments to Compensation [Member] Other Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Other Item Business Combination [Axis] Business Combination [Axis] Effect of cross-border tax laws Effective Income Tax Rate Reconciliation, Cross-Border Tax Effect, Amount Income Taxes Income Tax, Policy [Policy Text Block] Net cash flows from operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Remaining performance obligation (percent) Revenue, Remaining Performance Obligation, Percentage Stockholders' equity: Equity, Attributable to Parent [Abstract] Income Statement [Abstract] Income Statement [Abstract] Shares purchased (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans Document Transition Report Document Transition Report Precast Platform Precast Platform [Member] Precast Platform Eliminations Intersegment Eliminations [Member] Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Intangible assets subject to amortization Intangible Asset, Finite-Lived [Table Text Block] City Area Code City Area Code Impairment, number of reporting units tested, qualitative Indefinite Lived Intangible Assets, Number Of Reporting Units, Qualitative, Tested Indefinite Lived Intangible Assets, Number Of Reporting Units, Qualitative, Tested Name Forgone Recovery, Individual Name Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Entity [Domain] Entity [Domain] Equivalent number of shares expected to vest (in shares) Share-based compensation arrangement by share-based payment award, equivalent shares expected to vest Equivalent number of shares expected to vest under share-based compensation arrangement as of the balance sheet date. Total environmental liabilities Accrual for Environmental Loss Contingencies Effective Income Tax Rate Reconciliation [Line Items] Effective Income Tax Rate Reconciliation [Line Items] Commodity contract commitments Derivative, Nonmonetary Notional Amount, Mass Pension assets, actual allocation (percent) Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage Construction products Construction Products [Member] Construction Products Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Liability, Noncurrent Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Liability, Noncurrent Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Liability, Noncurrent Benefit obligation at beginning of year Benefit obligation at end of year Defined Benefit Plan, Benefit Obligation Total deferred tax liabilities Deferred Tax Liabilities, Net NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Nature of Operations [Text Block] Current: Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Taxes other than income taxes Accrual for Taxes Other than Income Taxes, Current Stock-based compensation expense Share-Based Payment Arrangement, Expense Defined Benefit Plan, Plan Assets, Category [Domain] Defined Benefit Plan, Plan Assets, Category [Domain] Inventories Business Combination, Recognized Asset Acquired, Inventory, Current Acquisitions Goodwill, Acquired During Period Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Other foreign jurisdictions Income Tax Jurisdiction, Foreign, Other [Member] Reporting Unit [Axis] Reporting Unit [Axis] Granted, weighted average grant-date fair value (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value IRC Section 50(c)(1) - basis adjustment Effective Income Tax Rate Reconciliation, Investment Credit, Basis Adjustment, Amount Effective Income Tax Rate Reconciliation, Investment Credit, Basis Adjustment, Amount Payables and Accruals [Abstract] Payables and Accruals [Abstract] Other accrued expenses and payables Other Accounts Payable and Accrued Liabilities Forfeited, weighted average grant-date fair value (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Additions, Charged to Cost and Expense SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense Other tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent Cash and cash equivalents Business Combination, Recognized Asset Acquired, Cash and Cash Equivalent Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Debt issuance costs Payments of Debt Issuance Costs Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Entity Current Reporting Status Entity Current Reporting Status Minimum interest coverage ratio Minimum Interest Coverage Ratio This represents minimum interest coverage ratio applicable to current period stated in debt covenant. Net cash flows from (used by) financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount 2032 Notes $300 Million Notes At 4.375% Due March 2032 [Member] $300 Million Notes At 4.375% Due March 2032 Business Combination Business Combination [Table Text Block] Schedule of Pro Forma Information Business Combination, Pro Forma Information [Table Text Block] 2029 Long-Term Debt, Maturity, Year Three Changes in Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block] Deferred compensation liability, noncurrent Deferred Compensation Liability, Classified, Noncurrent Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Cash flows from (used by) financing activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Property, plant and equipment, net Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Other miscellaneous Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Interest cost Defined Benefit Plan, Interest Cost Price per share (in dollars per share) Shares Issued, Price Per Share Income Tax Paid, State and Local, after Refund Received Income Tax Paid, State and Local, after Refund Received Recognized in OCI Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) Raw materials Raw Material Products [Member] Raw Material Products Derivative assets Derivative Asset INVENTORIES Inventory Disclosure [Text Block] Intangible Asset, Finite-Lived, Class [Axis] Intangible Asset, Finite-Lived, Class [Axis] GOODWILL AND OTHER INTANGIBLE ASSETS Intangible Asset and Goodwill [Text Block] Underlying Securities Award Underlying Securities Amount REVENUE RECOGNITION Revenue from Contract with Customer [Text Block] Components of earnings from continuing operations before income taxes (benefit) Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] State Income Tax Jurisdiction, Domestic State and Local [Member] Other Payment for (Proceeds from) Other Investing Activity Inventories Increase (Decrease) in Inventories Fabricated Product without Installation Services Fabricated Product without Installation Services [Member] Fabricated Product without Installation Services [Member] Operating leases, weighted average discount rate Operating Lease, Weighted Average Discount Rate, Percent Cost, amortization Cost, Amortization Segment Reporting [Table] Segment Reporting [Table] Shares available for future grants (in shares) Shares available for future issuance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Effective rate for interest on benefit obligations Defined Benefit Plan, Effective Interest Rate on Benefit Obligations Defined Benefit Plan, Effective Interest Rate on Benefit Obligations Lease Cost Lease, Cost [Table Text Block] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Other comprehensive income (loss), reclassification for realized gain, tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax Cash Flow and Other Information Related to Leases Cash Flow and Other Information Related to Leases [Table Text Block] Cash Flow and Other Information Related to Leases Current Fiscal Year End Date Current Fiscal Year End Date Total finance lease expense Finance Lease, Cost Finance Lease, Cost Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Derivative [Line Items] Derivative [Line Items] Long-lived assets Long-Lived Asset, Excluding Financial Instrument, Customer Relationship, Mortgage Servicing Right, Deferred Policy Acquisition Cost, and Deferred Tax Asset, Amount Lease Not yet Commenced Unrecorded Unconditional Purchase Obligation Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Finance Lease, Right-Of-Use Asset, Increase During Period Finance Lease, Right-Of-Use Asset, Increase During Period Finance Lease, Right-Of-Use Asset, Increase During Period Entity File Number Entity File Number CMCP CMCP [Member] It represents CMC Poland Sp. z o.o. ("CMCP"), formerly CMC Zawiercie S.A. or CMCZ. Issuance of stock under incentive and purchase plans, net of forfeitures Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Proceeds from accounts receivable facilities Proceeds from (Repayments of) Short-Term Debt Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax Weighted Average Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Measure: Measure [Axis] Allowance for doubtful accounts SEC Schedule, 12-09, Allowance, Credit Loss [Member] Treasury stock, shares Beginning balance, treasury stock, shares Ending balance, treasury stock, shares Treasury Stock, Common, Shares Schedule of Future Pension Benefit Payments Schedule of Expected Benefit Payments [Table Text Block] Long-term environmental liabilities Accrued Environmental Loss Contingencies, Noncurrent Adjusted EBITDA reportable segments Adjusted Operating Profit Loss from Continuing Operation It represents non-GAAP financial measures of adjusted operating profit (loss) from continuing operations. Equity Components [Axis] Equity Components [Axis] Proceeds From Government Grants Related To Income Proceeds From Government Grants Related To Income Proceeds From Government Grants Related To Income Income Tax Paid, after Refund Received Income Tax Paid, after Refund Received Valuation allowance for deferred tax assets Deferred Tax Assets, Valuation Allowance Entity Interactive Data Current Entity Interactive Data Current Current Finance Lease, Liability, Current Deferred compensation liability, total Deferred Compensation Liability, Current and Noncurrent Entity Small Business Entity Small Business Property, Plant, and Equipment [Line Items] Property, Plant, and Equipment [Line Items] Effective Income Tax Rate Reconciliation [Table] Effective Income Tax Rate Reconciliation [Table] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Non-deductible compensation Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount Other noncurrent assets Other Assets, Noncurrent 2029 Finance Lease, Liability, to be Paid, Year Three Document Type Document Type Acquisitions, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Maximum Borrowing Capacity With Bank Approval Maximum Borrowing Capacity With Bank Approval [Member] Maximum Borrowing Capacity With Bank Approval Short Short [Member] Intangible Asset, Indefinite-Lived Intangible Asset, Indefinite-Lived [Table Text Block] Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Long-term debt, excluding other borrowings and finance leases Long-Term Debt, Excluding Other Borrowings and Finance Leases Long-Term Debt, Excluding Other Borrowings and Finance Leases Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Proceeds from issuance of long-term debt, net Proceeds from Issuance of Long-Term Debt Local Phone Number Local Phone Number Inventory, Work in Process, Gross Inventory, Work in Process, Gross Net deferred tax liabilities Deferred Tax Liabilities, Gross Bonds Bonds [Member] Change for tax positions of current year Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Earnings before income taxes Earnings before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Commitments and contingencies (Note 16) Commitments and Contingencies Deductions, Charged to Other Accounts Valuation Allowances and Reserves, Deductions, Charged to Other Accounts Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to accounts other than costs and expenses in a given period. Property, plant and equipment, Gross Property, Plant, and Equipment, before Accumulated Depreciation, Depletion, and Amortization Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] 2030 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Four Equipment Machinery and Equipment [Member] Executive Category: Executive Category [Axis] Performance Condition [Domain] Performance Condition [Domain] Performance Condition [Domain] Counterparty Name [Axis] Counterparty Name [Axis] Liabilities and stockholders' equity Liabilities and Equity [Abstract] Repayments under accounts receivable facilities Repayments Under Accounts Receivable Programs, Financing Activities Repayments Under Accounts Receivable Programs, Financing Activities Inventories Inventory, Net Inventory, Net Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Nontaxable gain Effective Income Tax Rate Reconciliation, Nondeductible Expense (Gain), Amount Effective Income Tax Rate Reconciliation, Nondeductible Expense (Gain), Amount Qualifying Advanced Energy Project Tax Credit, income tax benefit Qualifying Advanced Energy Project Tax Credit, Income Tax Benefit Qualifying Advanced Energy Project Tax Credit, Income Tax Benefit Number Of Electric Arc Furnace Micro Mills Number Of Electric Arc Furnace Micro Mills Number Of Electric Arc Furnace Micro Mills Supplemental information: Supplemental Cash Flow Information [Abstract] Reclassification for realized gain Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] PEO Name PEO Name Leasehold improvements Leasehold Improvements [Member] Derivatives Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Cash paid for income taxes Income Tax Paid, before Refund Received Other segment Segment Reporting, Other Segment Item, Amount Property, Plant and Equipment, Type [Axis] Long-Lived Asset, Class [Axis] Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] I.R.S. Employer Identification No. Entity Tax Identification Number Net unrealized holding gain (loss) Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax Stock-based compensation expense, tax Share-Based Payment Arrangement, Expense, Tax Benefit Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] Net holding gain on segregated assets Gain (Loss) Recognized on Assets Transferred to Separate Account Business Combination, Intangible Asset, Acquired, Finite-Lived and Indefinite-Lived Business Combination, Intangible Asset, Acquired, Finite-Lived and Indefinite-Lived [Table Text Block] Revenue Recognition Revenue [Policy Text Block] Total long-term debt outstanding, excluding finance leases Long-term Debt, Net of Finance Leases Long-term Debt, Net of Finance Leases Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] 2030 Notes $300 Million Notes At 4.125% Due January 2030 [Member] $300 Million Notes At 4.125% Due January 2030 Comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Debt Instrument [Axis] Debt Instrument [Axis] Other noncurrent liabilities Business Combination, Recognized Liability Assumed, Other Liability, Noncurrent Stock-based compensation Share-Based Payment Arrangement, Noncash Expense Total lease expense Lease, Cost Land Land Long Long [Member] Employee stock purchase plan Employee Stock [Member] Government Assistance Government Grants [Policy Text Block] Government Grants [Policy Text Block] Basic (in shares) Earnings Per Share, Basic Total current assets Assets, Current Insider Trading Arrangements [Line Items] Intangible Asset, Indefinite-Lived, Acquired [Line Items] Intangible Asset, Indefinite-Lived, Acquired [Line Items] Document Annual Report Document Annual Report Accounts receivable (less allowance for doubtful accounts of $3,867 and $3,186) Accounts Receivable, after Allowance for Credit Loss, Current Commodity Commodity Contract [Member] Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Asset, Noncurrent Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Asset, Noncurrent Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Asset, Noncurrent Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover page. Cover [Abstract] Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] Indefinite-lived intangible assets, tested for impairment Indefinite-Lived Intangible Assets, Impairment Testing Indefinite-Lived Intangible Assets, Impairment Testing Equity Awards Adjustments Equity Awards Adjustments [Member] Funded status at end of year liability recognized in the consolidated balance sheets as of August 31, Defined Benefit Plan, Funded (Unfunded) Status of Plan Energy tax credits - 48C advanced energy project credit Effective Income Tax Rate Reconciliation, Tax Credit, Energy-Related, Percent Electricity Electricity [Member] Income Tax Jurisdiction [Domain] Income Tax Jurisdiction [Domain] Inventory Disclosure [Abstract] Inventory Disclosure [Abstract] 2031 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Five Forfeited, number (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Preferred stock, shares authorized (shares) Preferred Stock, Shares Authorized Benefits paid Defined Benefit Plan, Benefit Obligation, Benefits Paid U.K. Pension Plan U.K. Pension Plan [Member] U.K. Pension Plan Actual debt to capitalization ratio Debt to Capitalization Ratio It represents actual debt to capitalization ratio for an applicable date. Foreign currency translation Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) Operating cash outflows from finance leases Finance Lease, Interest Payment on Liability Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] In-process research and development In Process Research and Development [Member] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Income Tax Jurisdiction [Axis] Income Tax Jurisdiction [Axis] INCOME TAX Income Tax Disclosure [Text Block] Number Of States In Operation Number Of States In Operation Number Of States In Operation 2031 Lessee, Operating Lease, Liability, to be Paid, Year Five Impairment, number of reporting units tested, quantitative Indefinite Lived Intangible Assets, Number Of Reporting Units, Quantitative, Tested Indefinite Lived Intangible Assets, Number Of Reporting Units, Quantitative, Tested Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location [Table Text Block] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Consideration transferred Business Combination, Consideration Transferred Retirement Plan Type [Domain] Retirement Plan Type [Domain] Entity Filer Category Entity Filer Category Realized and unrealized gain (loss) on investment and foreign currency Gain (Loss), Investment and Derivative, Operating, and Foreign Currency Transaction, before Tax Total amounts outstanding Long-term Debt And Finance Lease Obligations, Net Long-term Debt And Finance Lease Obligations, Net Finance Leases Finance Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract] Expected long-term rate of return Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Energy Aid Program, 2022 Energy Aid Program, 2022 [Member] Energy Aid Program, 2022 Current assets: Assets, Current [Abstract] Derivative liabilities Derivative Liability Pro forma net sales Business Combination, Pro Forma Information, Pro Forma Revenue Government Assistance, Type [Domain] Government Assistance, Type [Domain] Senior Notes Senior Notes [Member] Foreign Currencies Foreign Currency Transactions and Translations Policy [Policy Text Block] Entity Address, Address Line One Entity Address, Address Line One Operating leases Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Vested, weighted average grant-date fair value (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Share-based Arrangements with Employees and Nonemployees [Abstract] Share-Based Payment Arrangement, Disclosure [Abstract] Income tax expense Income tax expense Income Tax Expense (Benefit) Adjustments to reconcile net earnings to net cash flows from operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Noncash Item [Abstract] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Consolidation Consolidation, Policy [Policy Text Block] Accrued contingent litigation-related loss Loss Contingency, Accrual, Current Deferred income taxes Business Combination, Recognized Liability Assumed, Deferred Tax Liability Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Valuation Technique, Discounted Cash Flow Valuation Technique, Discounted Cash Flow [Member] Statement [Table] Statement [Table] Information about Assets and Liabilities from Contracts with Customers Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Derivative assets Derivative Asset, Subject to Master Netting Arrangement, before Offset Bonds, effective yield (interest rate) Bonds, Effective Yield (Interest Rate) Bonds, Effective Yield (Interest Rate) Receivables secured by credit insurance or letters of credit Secured Accounts Receivable [Member] Secured Accounts Receivable. Other: Effective Income Tax Rate Reconciliation, Other Reconciling Items, Percent [Abstract] Damages sought Loss Contingency, Damages Sought, Value Beginning Balance Ending Balance Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs United States Current Federal Tax Expense (Benefit) Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract]