Document And Entity Information Derivatives Not Designated as Hedging Instruments [Table Text Block] Note To Financial Statement Details Textual us-gaap_DerivativeNotionalAmount Hot-rolled coil steel contracts Gain on economic hedges of risk Gain on economic hedges of risk Note 2 - Business Combinations Note 4 - Inventories Note 6 - Leases Note 8 - Stock Based Compensation Note 9 - Derivative Financial Instruments Note 10 - Fair Value Measurements Note 11 - Segment Information Not Designated as Hedging Instrument [Member] Note 12 - Revenue Note 13 - Stockholders' Equity Accounts receivable Income Tax Disclosure [Text Block] Note 14 - Earnings Per Share ASSET BASED LENDING FACILITY Note 2 - Business Combinations - Fair Value of Assets Acquired and Liabilities Assumed (Details) Note 2 - Business Combinations - Pro Forma Operating Results (Details) Hedging Designation [Axis] Inventory Note 4 - Inventories - Schedule of Inventory (Details) Hedging Designation [Domain] us-gaap_LiabilitiesCurrent TOTAL CURRENT LIABILITIES Note 6 - Leases - Lease Cost (Details) Designated as Hedging Instrument [Member] Note 6 - Leases - Balance Sheet Information (Details) Note 6 - Leases - Maturities of Operating and Finance Lease (Details) Note 8 - Stock Based Compensation - Restricted Stock Activity (Details) Note 9 - Derivative Financial Instruments - Net Fair Value of Derivative Financial Instruments (Details) Note 9 - Derivative Financial Instruments - Gain (Loss) Recognized in Earnings for Derivative Instruments (Details) Note 9 - Derivative Financial Instruments - Summary of Non-Designated Derivative Instruments (Details) us-gaap_BusinessCombinationConsiderationTransferred1 Business Combination, Consideration Transferred Note 10 - Fair Value Measurements - Recurring Fair Value Measurements (Details) Note 11 - Segment Information - Segment Information (Details) Note 12 - Revenue - Disaggregation of Revenue (Details) Note 13 - Stockholders' Equity - Schedule of Stockholders' Equity (Details) Note 13 - Stockholders' Equity - Schedule of Stockholders' Equity (Details) (Parentheticals) us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred Business Combination, Consideration Transferred, Liabilities Incurred Note 14 - Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) Note 14 - Earnings Per Share - Restricted Stock Units (Details) Notes To Financial Statements Notes To Financial Statements [Abstract] Granted, grant date fair value per share (in dollars per share) Derivative liability Current portion of derivative liability Vested, grant date fair value per share (in dollars per share) Cancelled or forfeited, grant date fair value per share (in dollars per share) us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue Unvested, grant date fair value per share (in dollars per share) Unvested, grant date fair value per share (in dollars per share) Cancelled or forfeited (in shares) us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber Unvested (in shares) Unvested (in shares) Schedule of Derivative Instruments [Table Text Block] Derivative [Table] Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod Vested (in shares) Nonvested Restricted Stock Shares Activity [Table Text Block] us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss Earnings from operations Business Combination, Pro Forma Information [Table Text Block] us-gaap_BusinessAcquisitionsProFormaRevenue Net sales Financial Instruments [Domain] Accounts payable and accrued expenses us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent Financial Instrument [Axis] Accrued employee compensation and related expenses Income taxes payable Lessee, Operating Leases [Text Block] Dividends payable Fiscal 2029 and beyond, operating leases Amount of lessee's undiscounted obligation for lease payment for operating lease due after fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Credit Facility [Axis] Credit Facility [Domain] Business Combination, Recognized Asset Acquired and Liability Assumed [Table Text Block] us-gaap_PolicyTextBlockAbstract Accounting Policies us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares) us-gaap_NotesIssued1 Notes Issued us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) us-gaap_LiabilitiesAssumed1 Liabilities Assumed us-gaap_PaymentsToAcquirePropertyPlantAndEquipment Purchase of property, plant and equipment Delivery Expense [Member] Represents information pertaining to delivery expenses. Processing and Warehouse Expense [Member] Represents information pertaining to processing and warehouse expenses. us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1 Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) us-gaap_IncomeTaxesPaidNet Income Taxes Paid, Net CURRENT LIABILITIES: us-gaap_InterestPaid Interest Paid, Including Capitalized Interest, Operating and Investing Activities Identifiable assets TOTAL ASSETS Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Plan Name [Axis] Plan Name [Domain] PROPERTY, PLANT AND EQUIPMENT: us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount frd_IncreaseDecreaseInRightofassets Amortization of right-of-use asset The increase (decrease) in the balance of right-of-use assets during the period. Commercial Expense [Member] Represents information pertaining to commercial expense. us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1 Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic Net earnings (loss) attributable to common shareholders us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits Less: Allocation to unvested restricted stock units Flat-roll [Member] Represents information pertaining to the flat- roll segment. Share-Based Payment Arrangement [Text Block] Award Type [Domain] Effective Income Tax Rate Reconciliation [Table] Award Type [Axis] Net earnings NET EARNINGS (LOSS) Restricted Stock Units (RSUs) [Member] Schedule of Balance Sheet Information Related to Operating Leases [Table Text Block] Tabular disclosure of balance sheet information related to operating leases. Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Antidilutive Security, Excluded EPS Calculation [Table] frd_OperatingLeaseMonthlyPayments Operating Lease, Monthly Payments Amount of monthly payments related to operating lease. Business Combination [Text Block] us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment Less accumulated depreciation us-gaap_PropertyPlantAndEquipmentNet Total property, plant, and equipment Machinery and equipment Customer Owned [Member] Information pertaining to customer owned coil. Construction in process Construction in Progress, Gross Prime Coil [Member] Information pertaining to prime coil. Land Buildings and yard improvements Manufactured Pipe [Member] Information pertaining to manufactured pipe. NON-CURRENT LEASE LIABILITIES Represents the noncurrent portion of operating and finance lease liabilities. Change in postretirement benefits Derivative Instrument [Axis] Derivative Contract [Domain] INVESTING ACTIVITIES Hot-rolled Coil Future Contracts [Member] Represents hot-rolled coil future contracts. Seller's Note [Member] Represents a Seller's Note. Material Sold Expense [Member] Represents the cost of materials sold. Net earnings (loss) per share: Earnings Per Share [Text Block] frd_BusinessCombinationContingentConsiderationTerm Business Combination, Contingent Consideration, Term (Year) The amount of time over which the contingent consideration may be earned. us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable Income taxes payable us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities Accounts payable and accrued expenses us-gaap_DeferredFinanceCostsGross Debt Issuance Costs, Gross us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities Employee compensation and related expenses us-gaap_IncomeTaxExpenseBenefit Income Tax Expense (Benefit) Income Tax Expense (Benefit) us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet Gain recognized on open derivatives not designated for hedge accounting Hot-rolled coil steel contracts Cash us-gaap_InterestExpenseNonoperating Interest expense us-gaap_AllocatedShareBasedCompensationExpense Share-Based Payment Arrangement, Expense frd_OperatingAndFinanceLeaseRightofuseAsset Total right-of-use assets Amount of lessee's right to use underlying asset under operating and finance lease. Amendment Flag City Area Code frd_OperatingAndFinanceLeaseLiability Total lease liabilities Present value of lessee's discounted obligation for lease payments from operating and finance lease. Operating and Finance Lease, Liability, Maturity [Table Text Block] Tabular disclosure of undiscounted cash flows of operating and finance lease liability. us-gaap_GainLossOnSaleOfPropertyPlantEquipment Loss on disposal of property, plant and equipment Current Fiscal Year End Date us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 Debt Instrument, Basis Spread on Variable Rate Increase (decrease) in operating liabilities, net of amounts assumed in business combination: us-gaap_DebtInstrumentInterestRateStatedPercentage Debt Instrument, Interest Rate, Stated Percentage us-gaap_LeaseCost Lease, Cost us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent Operating Lease, Weighted Average Discount Rate, Percent Document Fiscal Period Focus Operating lease expense Document Fiscal Year Focus Lease, Cost [Table Text Block] Document Period End Date us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1 Operating Lease, Weighted Average Remaining Lease Term (Year) Entity File Number Entity Emerging Growth Company us-gaap_DebtInstrumentFaceAmount Debt Instrument, Face Amount Document Type Interim Period, Costs Not Allocable [Domain] Entity Small Business Entity Shell Company us-gaap_DividendsCommonStockCash Cash dividends Document Information [Line Items] Document Information [Table] Nature of Expense [Axis] Entity Filer Category Debt Instrument [Axis] Entity Current Reporting Status Debt Instrument, Name [Domain] Variable Rate [Domain] Prime Rate [Member] Schedule of Long-Term Debt Instruments [Table] Variable Rate [Axis] us-gaap_IncreaseDecreaseInAccountsReceivable Accounts receivable Entity Tax Identification Number Entity Central Index Key Depreciation and amortization Entity Registrant Name Paid in capital – restricted stock units Entity [Domain] Legal Entity [Axis] Entity Address, Address Line One ecd_NonRule10b51ArrTrmntdFlag Non-Rule 10b5-1 Arrangement Terminated [Flag] us-gaap_TreasuryStockValueAcquiredCostMethod Repurchase of shares Entity Address, City or Town ecd_Rule10b51ArrTrmntdFlag Rule 10b5-1 Arrangement Terminated [Flag] ecd_Rule10b51ArrAdoptedFlag Rule 10b5-1 Arrangement Adopted [Flag] Entity Address, Postal Zip Code us-gaap_TreasuryStockCommonValue Treasury stock at cost (shares 1,907,323 and 1,906,693 shares at September 30, and March 31, 2025, respectively) Entity Address, State or Province ecd_NonRule10b51ArrAdoptedFlag Non-Rule 10b5-1 Arrangement Adopted [Flag] Material Terms of Trading Arrangement [Text Block] Delivery expense Costs of delivery included in costs of goods and services. Entity Common Stock, Shares Outstanding Trading Arrangements, by Individual [Table] ABL Facility [Member] Represents the asset-based revolving loans facility. frd_DebtInstrumentCovenantFixedChargeCoverageRatio Debt Instrument, Covenant, Fixed Charge Coverage Ratio Requirement for fixed charge coverage ratio under the debt agreement. us-gaap_IncreaseDecreaseInOtherCurrentAssets Other current assets us-gaap_IncreaseDecreaseInOtherNoncurrentAssets Other assets frd_LineOfCreditFacilityMaximumBorrowingCapacityMaximumConditionalIncrease Line of Credit Facility, Maximum Borrowing Capacity, Maximum Conditional Increase The maximum amount of increase to the maximum borrowing capacity of the line of credit facility upon the satisfaction of certain conditions. frd_LineOfCreditFacilityMaximumBorrowingCapacityConditionalIncreaseMinimumIncrements Line of Credit Facility, Maximum Borrowing Capacity, Conditional Increase, Minimum Increments The minimum amount per increment of increases to the maximum borrowing capacity of the line of credit facility upon the satisfaction of certain conditions. us-gaap_IncreaseDecreaseInInventories Inventories Trading Symbol frd_DebtInstrumentCovenantBorrowingLimitAsPercentOfAccountsReceivable Debt Instrument, Covenant, Borrowing Limit as Percent of Accounts Receivable Requirement for borrowing limit presented as a percent of accounts receivable under the debt agreement. Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd Line of Credit Facility, Interest Rate at Period End Local Phone Number us-gaap_TableTextBlock Notes Tables us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity Line of Credit Facility, Maximum Borrowing Capacity Issuance of restricted stock Selling, general and administrative Secured Overnight Financing Rate (SOFR) [Member] Line of Credit Facility, Lender [Domain] Lender Name [Axis] us-gaap_LiabilitiesAndStockholdersEquity TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY Decrease (increase) in operating assets, net of amounts acquired in business combination: Retained earnings Debt Disclosure [Text Block] Derivative Instruments, Gain (Loss) [Table Text Block] us-gaap_InterestExpense Interest expense us-gaap_DisclosureTextBlockAbstract Notes to Financial Statements Derivative Instruments and Hedging Activities Disclosure [Text Block] Inventory Disclosure [Text Block] Operating lease liability, non-current Schedule of Inventory, Current [Table Text Block] Inventory, Current [Table] Present value of lease liability, operating lease us-gaap_OperatingLeaseLiability Operating Lease, Liability Operating lease liability, current us-gaap_OperatingLeaseRightOfUseAsset Operating Lease, Right-of-Use Asset us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue Total undiscounted lease payments, operating leases frd_DebtInstrumentCovenantAvailabilityRemainingBeforeTestingPercentage Debt Instrument, Covenant, Availability Remaining Before Testing, Percentage The percentage of the maximum borrowing capacity that would trigger testing of the debt covenant. us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount Less: imputed interest, operating leases us-gaap_FinanceLeasePrincipalPayments Cash paid for principal portion of finance lease frd_DebtInstrumentCovenantAvailabilityRemainingBeforeTestingValue Debt Instrument, Covenant, Availability Remaining Before Testing, Value The amount of the agreement remaining before debt covenants are tested. us-gaap_DeferredIncomeTaxExpenseBenefit Deferred taxes Fiscal 2028, operating leases Hot-rolled Coil Steel Contracts [Member] Represents information related to hot-rolled coil steel contracts. Fiscal 2026, operating leases Fiscal 2027, operating leases Allowances for bad debts and cash discounts For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible and for discounts provided for cash payments. Compensation expense for restricted stock us-gaap_OtherAssetsNoncurrent Other assets Tubular Inventory [Member] Represents inventory designated for the Tubular segment of the reporting entity. Fiscal 2025 (remainder of fiscal year), operating leases JPMorgan Chase Bank N.A. [Member] The name of a lender of a credit facility. Tubular [Member] Represents the Tubular segment of the reporting entity's business. Granite City, IL Facility [Member] Relating to the Granite City, IL Facility. Depreciation and amortization us-gaap_DepreciationDepletionAndAmortization Total us-gaap_AssetsCurrent TOTAL CURRENT ASSETS Equity [Text Block] Fair Value Measurement Inputs and Valuation Techniques [Table] Treasury stock, common shares (in shares) Common stock, par value $1: Authorized shares — 10,000,000; Issued shares — 8,966,763 and 8,877,229 shares at September 30, and March 31, 2025 Measurement Frequency [Axis] Adjustments to reconcile net earnings to cash provided by operating activities: Measurement Frequency [Domain] Fair Value, Recurring [Member] Common stock, shares authorized (in shares) Common stock, shares issued (in shares) Common stock, par value (in dollars per share) Derivative asset Current portion of derivative assets Lessee, Lease, Description [Table] Product and Service [Axis] Other current assets Product and Service [Domain] Cash Flow, Supplemental Disclosures [Text Block] Property, Plant and Equipment Disclosure [Text Block] Inventories Total Net Sales Net Sales Fair Value, Inputs, Level 3 [Member] Flat-Roll finished goods Fair Value Hierarchy and NAV [Domain] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 2 [Member] Time Restricted Shares [Member] Represents time restricted shares. Performance Restricted Shares [Member] Represents performance restricted shares. Fair Value Hierarchy and NAV [Axis] Flat-Roll raw material OPERATING ACTIVITIES Schedule of Segment Reporting Information, by Segment [Table Text Block] Schedule of Segment Reporting Information, by Segment [Table] Statement [Line Items] us-gaap_NumberOfOperatingSegments Number of Operating Segments Accounts receivable, net of allowances for credit losses and cash discounts of $150 and $147 at September 30, and March 31, 2025, respectively us-gaap_NumberOfReportableSegments Number of Reportable Segments Additional paid-in capital STOCKHOLDERS’ EQUITY: Property, Plant and Equipment [Table] us-gaap_OtherNonoperatingIncomeExpense Other income Long-Lived Tangible Asset [Axis] Other income (expense) Segment Reporting Disclosure [Text Block] Long-Lived Tangible Asset [Domain] CURRENT ASSETS: Fair Value Disclosures [Text Block] us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations CASH AND RESTRICTED CASH AT BEGINNING OF PERIOD CASH AND RESTRICTED CASH AT END OF PERIOD us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect INCREASE (DECREASE) IN CASH AND RESTRICTED CASH OTHER ASSETS: us-gaap_Liabilities TOTAL LIABILITIES us-gaap_NetCashProvidedByUsedInFinancingActivities NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES COMMITMENTS AND CONTINGENCIES (SEE NOTE 2) us-gaap_OperatingIncomeLoss EARNINGS (LOSS) FROM OPERATIONS: EARNINGS (LOSS) FROM OPERATIONS us-gaap_NetCashProvidedByUsedInOperatingActivities NET CASH PROVIDED BY OPERATING ACTIVITIES us-gaap_NetCashProvidedByUsedInInvestingActivities NET CASH USED IN INVESTING ACTIVITIES us-gaap_CostOfGoodsAndServicesSold Cost of Product and Service Sold DEFERRED INCOME TAX LIABILITY Consolidation Items [Domain] Commodity swap contracts – financial assets, net Consolidation Items [Axis] us-gaap_CostOfGoodsAndServicesSoldDepreciationAndAmortization Depreciation and amortization Costs of materials sold (excludes items shown separately below) Processing and warehousing expense Condensed Cash Flow Statement [Table] us-gaap_PaymentsOfDividendsCommonStock Cash dividends paid us-gaap_CostsAndExpenses Costs and Expenses frd_PaymentsForDespositOnSteelProcessingEquipment Deposit on steel processing equipment The cash outflow associated with the deposit on steel processing equipment. us-gaap_PaymentsForRepurchaseOfCommonStock Cash paid for share repurchases Costs and expenses: Retained Earnings [Member] Treasury Stock, Common [Member] 2016 Restricted Stock Plan [Member] Represents the plan that is is administered by the Compensation Committee (the "Committee") of the Board of Directors (the "Board") and continues indefinitely until terminated by the Board or until all shares allowed by the Plan have been awarded and earned. Additional Paid-in Capital [Member] Common Stock [Member] Equity Components [Axis] Equity Component [Domain] Stock, Class of Stock [Table] us-gaap_CurrentIncomeTaxExpenseBenefit Current Provision for (benefit from) income taxes: Other Current Assets [Member] us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest EARNINGS BEFORE INCOME TAXES EARNINGS (LOSS) BEFORE INCOME TAXES us-gaap_LineOfCredit Long-Term Line of Credit us-gaap_PaymentsOfDebtIssuanceCosts Debt issuance cost Disaggregation of Revenue [Table Text Block] Disaggregation of Revenue [Table] Revenue from Contract with Customer [Text Block] Statement of Financial Position Location, Balance [Axis] Statement of Financial Position Location, Balance [Domain] Document Quarterly Report Entity Incorporation, State or Country Code Accounting Policies [Abstract] Document Transition Report Selling, General and Administrative Expenses [Member] us-gaap_RepaymentsOfLongTermLinesOfCredit Repayments on asset based lending facility Entity Interactive Data Current Cash dividends, per share (in dollars per share) Nonoperating Income (Expense) [Member] Security Exchange Name Title of 12(b) Security Borrowings on asset based lending facility Statement of Income Location, Balance [Axis] Statement of Income Location, Balance [Domain] Segments [Axis] Segments [Domain] Restricted Stock Units (in shares) Statement [Table] Statement of Financial Position [Abstract] us-gaap_EarningsPerShareDiluted Diluted (in dollars per share) Weighted average common shares outstanding (in shares) us-gaap_CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization Cost of Goods and Services Sold Business Combination [Axis] us-gaap_EarningsPerShareBasic Basic (in dollars per share) Business Combination [Domain] Statement of Cash Flows [Abstract] us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh Business Combination, Contingent Consideration, Range of Outcomes, Maximum, Amount Lease Contractual Term [Domain] Lease Contractual Term [Axis] Income Statement [Abstract] Operating lease right-of-use asset Amount of operating lease ROU assets acquired in business combination and recognized at acquisition date. Orlando, FL Facility [Member] Orlando, FL Facility frd_BusinessCombinationConsiderationTransferredEarnoutProvisions Business Combination, Consideration Transferred, Earn-out Provisions Amount of earn-out provisions transferred by the acquirer as part of consideration transferred in business combination. Includes, but is not limited to, business or subsidiary, or both, of acquirer transferred to former owner of acquiree. Century Metals and Supplies [Member] Century Metals and Supplies Long-term Incentive Plan [Member] Long-term Incentive Plan Loss on Disposal of Property, Plant and Equipment [Member] Loss on Disposal of Property, Plant and Equipment Century Leases [Member] Century Leases Tampa, FL Facility [Member] Tampa, FL Facility us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax Hot-rolled coil steel contracts Accounting Standards Update and Change in Accounting Principle [Table] us-gaap_DerivativeCollateralRightToReclaimCash Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset Accounting Standards Update and Change in Accounting Principle [Text Block] Flat-Roll Inventory [Member] Represents inventory designated for the Flat-Roll segment of the reporting entity. CONTINGENT CONSIDERATION LIABILITY Business Combination, Contingent Consideration, Liability, Noncurrent Fair Value, Liabilities Measured on Recurring Basis [Table Text Block] FINANCING ACTIVITIES us-gaap_PaymentsToAcquireLifeInsurancePolicies Increase in cash surrender value of officers’ life insurance Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Asset Acquisition [Table] us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet Total POSTRETIREMENT BENEFITS OTHER THAN PENSIONS Balance TOTAL STOCKHOLDERS’ EQUITY BALANCE us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired Payments to Acquire Businesses, Net of Cash Acquired us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCapitalLeaseObligation Operating lease liability Position [Domain] Class of Stock [Axis] Short [Member] Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] us-gaap_PaymentsToAcquireBusinessesGross Payments to Acquire Businesses, Gross Cash paid for Century business combination Schedule of Stockholders Equity [Table Text Block] Position [Axis] Future [Member] SELLER NOTE PAYABLE, NET us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable Accounts payable Operating Segments [Member] Swap [Member] Property, plant and equipment Other assets