Lessee, Operating Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract] Lessee, Operating Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract] Number of operating leases Number of Operating Leases Number of Operating Leases 2028 Defined Benefit Plan, Expected Future Benefit Payment, Year Two Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Interest expense limitation Deferred Tax Asset, Interest Carryforward Share Repurchase Program, Remaining Authorized, Amount Share Repurchase Program, Remaining Authorized, Amount U.S. Federal Statutory Income Tax Rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Share-Based Payment Arrangement, Outstanding Award, Activity, Excluding Option Share-Based Payment Arrangement, Outstanding Award, Activity, Excluding Option [Table Text Block] Cover [Abstract] Net increase (decrease) in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Lessee, Operating Lease, Liability, Maturity Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Inventories Deferred Tax Assets, Inventory Income Tax Jurisdiction [Domain] Income Tax Jurisdiction [Domain] Trading Symbol Trading Symbol Ownership percentage of investment Equity Method Investment, Ownership Percentage Non-NEOs Non-NEOs [Member] Income tax benefits Share-Based Payment Arrangement, Expense, Tax Benefit Cash dividends declared per common share (usd per share) Common Stock, Dividends, Per Share, Declared Goodwill and other indefinite-lived intangible assets Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] 2029 Defined Benefit Plan, Expected Future Benefit Payment, Year Three Cash dividends paid on common shares Dividends, Cash Dividends, Cash Accounts receivable, allowance for doubtful accounts Accounts Receivable, Allowance for Credit Loss, Current Disposal Group Name [Domain] Disposal Group Name [Domain] 2028 Lessee, Operating Lease, Liability And Finance Lease, Liability, Payments, Due Year Two Lessee, Operating Lease, Liability And Finance Lease, Liability, Payments, Due Year Two Accounts receivable, net Increase (Decrease) in Accounts Receivable Computation of basic and diluted earnings per share Schedule of Earnings Per Share Basic and Diluted [Abstract] -- None. No documentation exists for this element. -- The Company and Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Inventories Inventory, Policy [Policy Text Block] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Net income Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Fair Value Measurements Fair Value Disclosures [Text Block] Land Land [Member] Award Timing Disclosures [Line Items] Financing Receivable, Allowance for Credit Loss Financing Receivable, Allowance for Credit Loss [Table Text Block] Investment, Name [Domain] Investment, Name [Domain] Zinc Contract Zinc Contract [Member] Zinc Contract Other Other Customer [Member] Lease, Cost [Abstract] Lease, Cost [Abstract] Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Decrease in goodwill Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Goodwill Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Goodwill SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] Plan Name [Domain] Plan Name [Domain] United States UNITED STATES Total Lessee, Operating Lease, Liability And Finance Lease, Liability Lessee, Operating Lease, Liability And Finance Lease, Liability Other assets Other Assets, Noncurrent Leases [Abstract] Leases [Abstract] Environmental Loss Contingency, Current, Statement of Financial Position [Extensible Enumeration] Environmental Loss Contingency, Current, Statement of Financial Position [Extensible Enumeration] Finite-lived intangible assets, gross Finite-Lived Intangible Assets, Gross Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Research and experiment expenses Deferred Tax Assets, Tax Credit Carryforwards, Research Percent Effective Income Tax Rate Reconciliation, Percent [Abstract] Corporate bonds Corporate Bond Securities [Member] Operating Segments Operating Segments [Member] Other Effective Income Tax Rate Reconciliation, Other Reconciling Items, Percent Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Cash Flows From Operating Activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Share-based Payment Arrangement, Performance Shares, Outstanding Activity Share-Based Payment Arrangement, Performance Shares, Outstanding Activity [Table Text Block] Schedule of Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Secured Debt Secured Debt [Member] Award Timing Method Award Timing Method [Text Block] Net periodic benefit costs Net periodic benefit costs Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Directors Grants Directors Grants [Member] Directors grants. Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Weighted-average remaining lease term—finance leases Finance Lease, Weighted Average Remaining Lease Term Insider Trading Policies and Procedures [Line Items] Use of estimates Use of Estimates, Policy [Policy Text Block] Amount of receivables pledged Line of Credit Facility, Capacity Available for Trade Purchases Amounts reclassified from AOCI Reclassification from AOCI, Current Period, before Tax, Attributable to Parent Adjustment to Compensation, Amount Adjustment to Compensation Amount Capital in excess of par value Additional Paid in Capital, Common Stock Compensation Amount Outstanding Recovery Compensation Amount Disposal Group Classification [Axis] Disposal Group Classification [Axis] 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 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Excess Amount Operating Lease, Lease Income Operating Lease, Lease Income [Table Text Block] Long-lived assets Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Other assets and tax-deductible goodwill Deferred Tax Liabilities, Goodwill and Intangible Assets Credit Facility [Domain] Credit Facility [Domain] Proceeds from Sale of Machinery and Equipment Proceeds from Sale of Machinery and Equipment AIS Joint Venture AIS Joint Venture [Member] AIS Joint Venture Goodwill Goodwill, beginning balance Goodwill, ending balance Goodwill Amount of cash uninsured Cash, Uninsured Amount Tax payments related to common stock issued under stock-based plans Payment, Tax Withholding, Share-Based Payment Arrangement Other Comprehensive Income (Loss): Other Comprehensive Income (Loss), Net of Tax [Abstract] Stock repurchase program authorized amount Share Repurchase Program, Authorized, Amount Inventories Inventory Disclosure [Text Block] Income (Loss) From Equity Method Investments, Net Of Sale Income (Loss) From Equity Method Investments, Net Of Sale Income (Loss) From Equity Method Investments, Net Of Sale Employee Stock Option Share-Based Payment Arrangement, Option [Member] Depreciation Depreciation 2027 Lessee, Operating Lease, Liability, to be Paid, Year One Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Pension Plan Pension Plan [Member] Income taxes payable Accrued Income Taxes, Current Weighted-average discount rate—finance leases Finance Lease, Weighted Average Discount Rate, Percent Payments on Revolving Credit Facility Repayments of Lines of Credit Permanent Differences Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Municipal bonds Municipal Bonds [Member] 2027 Finance Lease, Liability, to be Paid, Year One Award Type [Axis] Award Type [Axis] Net deferred income tax liabilities Deferred Tax Liabilities, Net Currency Translation Adjustment Goodwill, Foreign Currency Translation Gain (Loss) AZZ Infrastructure Solutions AZZ Infrastructure Solutions [Member] AZZ Infrastructure Solutions Property, plant and equipment, net Property, plant, and equipment, net Property, Plant and Equipment, Net ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Total liabilities Liabilities Liabilities Long-Lived Assets Long-Lived Assets Common stock, par value (usd per share) Common Stock, Par or Stated Value Per Share Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Weighted-average life (in years) Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life Foreign Currency Translation Foreign Currency Transactions and Translations Policy [Policy Text Block] Equity in earnings of unconsolidated entities Equity In Earnings Of Unconsolidated Entities Equity In Earnings Of Unconsolidated Entities Revolving Credit Facility Revolving Credit Facility [Member] Expiration Date Trading Arrangement Expiration Date Cash flows from investing activities Net Cash Provided by (Used in) Investing Activities [Abstract] Operating lease liabilities―short-term Operating Lease, Liability, Current Total Shareholder Return Amount Total Shareholder Return Amount Amount Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract] Other Goodwill, Other Increase (Decrease) Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Net operating loss and other credit carryforwards Deferred Tax Assets, Operating Loss Carryforwards Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax Property, plant, and equipment, gross Property, Plant and Equipment, Gross Debt Instrument [Line Items] Debt Instrument [Line Items] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text 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(Loss), Net Of Tax Adjustment Attributable to Parent [Member] Accummulated Net Actuarial Gain (Loss), Net Of Tax Adjustment Attributable to Parent Cost of sales Cost of Sales [Member] Cash and cash equivalents Defined Benefit Plan, Cash and Cash Equivalents [Member] Shares authorized (shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Sale of Stock [Domain] Sale of Stock [Domain] Unrealized translation gain (loss) Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Document Fiscal Period Focus Document Fiscal Period Focus 2030 Long-Term Debt, Maturity, Year Four All Executive Categories All Executive Categories [Member] Employee and director stock awards Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements 2028 Finite-Lived Intangible Asset, Expected Amortization, Year Two Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Assets Assets [Abstract] Assets [Abstract] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Metal Coatings Metal Coatings [Member] Metal Coatings Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Document Type Document Type Derivative Contract [Domain] Derivative Contract [Domain] Actuarial gain (loss) Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) Operations and assets by segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Nonrelated Party Nonrelated Party [Member] Depreciation and amortization Depreciation, Amortization and Accretion, Net Schedule of Finite-Lived Intangible Assets, Future Amortization Expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Maximum Maximum [Member] Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Changes in Unrecognized Tax Benefits Effective Income Tax Rate Reconciliation, Tax Contingency, Amount Finite-Lived Intangible Assets, Net Finite-Lived Intangible Assets, Net Furniture and fixtures Furniture and Fixtures [Member] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Accounts payable Accounts Payable, Current Related party, amount of transaction Related Party Transaction, Amounts of Transaction Total lease expense Lease, Cost Statistical Measurement [Axis] Statistical Measurement [Axis] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Unrealized gain (loss) on interest rate swap, net of tax for unconsolidated subsidiary Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Unconsolidated Subsidiary, before Reclassification, after Tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Unconsolidated Subsidiary, before Reclassification, after Tax Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Return factor Redemption Price, Return Factor Redemption Price, Return Factor Depreciation methods and property basis differences Deferred Tax Liabilities, Property, Plant and Equipment Name Outstanding Recovery, Individual Name Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Cost of sales Variable Lease, Cost Total purchase price, net of cash acquired Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net Thereafter Finance Lease, Liability, to be Paid, Thereafter Finance Lease, Liability, to be Paid, Thereafter Actual return Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Investment Return (Loss) Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Investment Return (Loss) Award Timing Predetermined Award Timing Predetermined [Flag] Equity Method Investment, 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yet Recognized, Period for Recognition Sales Revenue from Contract with Customer, Excluding Assessed Tax Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Interest expense, net Interest expense, net Interest expense, net Interest Expense, Operating and Nonoperating Income Tax Jurisdiction [Axis] Income Tax Jurisdiction [Axis] Business Acquisition [Line Items] Business Acquisition [Line Items] Stock Compensation Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Percent Employee-related expenses Other Employee-related Liabilities, Current All Adjustments to Compensation All Adjustments to Compensation [Member] Equity Method Investments Equity Method Investments [Table Text Block] Accrued salaries and wages Employee-related Liabilities, Current Prepaid expenses and other Increase (Decrease) in Prepaid Expense and Other Assets Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Unrealized gain (loss) unconsolidated subsidiary, tax expense OCI, Equity Method Investment, Tax Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Legal Entity [Axis] Legal Entity [Axis] Accrued dividends on Series A Preferred Stock Dividends Accrued But Not Yet Paid Dividends Accrued But Not Yet Paid Defined Benefit Plan, Cash Defined Benefit Plan, Cash [Member] Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] U.S. Government bonds US Government Agencies Debt Securities [Member] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Entity Address, State or Province Entity Address, State or Province Derivative Instruments and Hedging Activities Disclosure [Abstract] Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Defined Benefit Plan, Plan Assets, Category [Domain] Defined Benefit Plan, Plan Assets, Category [Domain] Equity, Class of Treasury Stock [Line Items] Equity, Class of Treasury Stock [Line Items] Outstanding at beginning of year (usd per share) Outstanding at end of year (usd per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Liabilities and Shareholders' Equity Liabilities and Equity [Abstract] Schedule of Net Benefit Costs Schedule of Net Benefit Costs [Table Text Block] Restatement Determination Date Restatement Determination Date Accounts receivable Deferred Tax Asset, Tax Deferred Expense, Reserve and Accrual, Accounts Receivable, Allowance for Credit Loss Periodic payments Debt Instrument, Periodic Payment Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Sale of Stock, Consideration Received On Transaction, Gross Sale of Stock, Consideration Received On Transaction, Gross Sale of Stock, Consideration Received On Transaction, Gross Number of finance leases Number of Finance Leases Number of Finance Leases Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Electrical/Utility Electrical/Utility [Member] Electrical/Utility Operating right-of-use assets Operating Lease, Right-of-Use Asset Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Property, Plant and Equipment [Abstract] Property, Plant and Equipment [Abstract] Total Liabilities Financial Liabilities Fair Value Disclosure Earnings Per Share Earnings Per Share [Text Block] Restructuring and Impairment Charges Restructuring, Impairment, and Other Activities Disclosure [Text Block] Common stock issued under employee stock purchase plan Stock Issued During Period, Value, Employee Stock Purchase Plan Research and development tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Research, Percent Dividends on Series A Preferred Stock Dividends, Preferred Stock Unrealized gain (loss) on interest rate swap, net of tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax Granted, Weighted Average Grant Date Fair Value (usd 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 Income taxes Income Tax, Policy [Policy Text Block] Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Segments [Domain] Segments [Domain] Finance Lease, Liability, Maturity Finance Lease, Liability, to be Paid, Maturity [Table Text Block] Unrecognized Tax Benefits [Roll Forward] Unrecognized Tax Benefits [Roll Forward] Proceeds from Revolving Credit Facility Proceeds from Lines of Credit Effect of Cross-Border Tax Laws Effective Income Tax Rate Reconciliation, Cross-Border Tax Effect, Amount PEO PEO [Member] Natural Gas Contract Natural Gas Contract [Member] Natural Gas Contract Name Trading Arrangement, Individual Name Azz Inc. Azz Inc. [Member] Azz Inc. Property, Plant and Equipment, Type [Axis] Long-Lived Tangible Asset [Axis] Accumulated other comprehensive (income) loss before adjustment for tax effects ("AOCI") AOCI at beginning of fiscal year AOCI at fiscal year end Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax Entity Public Float Entity Public Float Disposal Group Name [Axis] Disposal Group Name [Axis] Equity in earnings of unconsolidated subsidiaries Income (Loss) from Equity Method Investments Commitment fee percentage Line of Credit Facility, Unused Capacity, Commitment Fee Percentage PBO at beginning of fiscal year PBO at fiscal year end Defined Benefit Plan, Benefit Obligation Transportation Power Generation [Member] Power Generation [Member] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Thereafter Lessee, Operating Lease, Liability And Finance Lease, Liability, To Be Paid, Thereafter Lessee, Operating Lease, Liability And Finance Lease, Liability, To Be Paid, Thereafter Share for future issuance (shares) Common Stock, Capital Shares Reserved for Future Issuance 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] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Share Based Compensation (Textual) [Abstract] Share Based Compensation (Textual) [Abstract] Share based compensation. Local Phone Number Local Phone Number Liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract] Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Equity Method Investment [Table] Equity Method Investment [Table] Postemployment Benefits [Abstract] Postemployment Benefits [Abstract] Environmental liability—current Accrued Environmental Loss Contingencies, Current PEO Total Compensation Amount PEO Total Compensation Amount Granted option lower than Share-Based Compensation Arrangement by Share-Based Payment Award, Purchase Price of Common Stock, Percent Residual value Acquired Finite-Lived Intangible Asset, Residual Value Property, Plant and Equipment, Type [Domain] Long-Lived Tangible Asset [Domain] Statement of Income Location, Balance [Axis] Statement of Income Location, Balance [Axis] Less imputed interest Lessee, Operating Lease, Liability And Finance Lease, Liability, Undiscounted Excess Amount Lessee, Operating Lease, Liability And Finance Lease, Liability, Undiscounted Excess Amount Long-lived Assets by Geographic Areas Long-Lived Assets by Geographic Areas [Table Text Block] Defined Benefit Plan, Plan Assets, Category [Axis] Defined Benefit Plan, Plan Assets, Category [Axis] Accrued Professional Fees Accrued Professional Fees Debt Disclosure [Abstract] Debt Disclosure [Abstract] Common Stock Common Stock [Member] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Line of Credit Line of Credit [Member] Segment Reporting [Abstract] Segment Reporting [Abstract] Entity Central Index Key Entity Central Index Key Schedule of inventory Schedule of Inventory, Current [Table Text Block] Equity Method Investments and Joint Ventures [Abstract] Other Accrued Liabilities Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block] Foreign Currency Translation Gain (Loss) Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Mezzanine Equity Equity Equity [Text Block] Standby And Commercial Letters Of Credit Standby And Commercial Letters Of Credit [Member] Standby And Commercial Letters Of Credit Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Operating Segments Segment Reporting Disclosure [Text Block] Legal matter Professional Fees 2027 Lessee, Operating Lease, Liability And Finance Lease, Liability, Payments, Due Next Twelve Months Lessee, Operating Lease, Liability And Finance Lease, Liability, Payments, Due Next Twelve Months Title Trading Arrangement, Individual Title Balance at beginning of period Balance at end of period Unrecognized Tax Benefits City Area Code City Area Code Current liabilities: Liabilities, Current [Abstract] Auditor Location Auditor Location Disposal Group Classification [Domain] Disposal Group Classification [Domain] Revenue recognition Revenue [Policy Text Block] Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] Interest Income and Interest Expense Disclosure Interest Income and Interest Expense Disclosure [Table Text Block] Remaining borrowing capacity on line of credit Line of Credit Facility, Remaining Borrowing Capacity Repurchase and retirement of treasury stock Payments for Repurchase of Common Stock Long-term debt, net Long-term debt, net Long-Term Debt, Excluding Current Maturities Workers' compensation liability Workers' 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treasury shares (shares) Stock Repurchased and Retired During Period, Shares Class of Stock [Domain] Class of Stock [Domain] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Inventories Increase (Decrease) in Inventories Supplemental Cash Flow Elements [Abstract] Schedule of Debt Schedule of Debt [Table Text Block] Amount awarded to other party Litigation Settlement, Amount Awarded to Other Party 2028 Long-Term Debt, Maturity, Year Two Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Equity Awards Adjustments Equity Awards Adjustments [Member] Total Operating Lease, Liability Underlying Securities Award Underlying Securities Amount Performance Shares Performance Shares [Member] Credit Agreement 2022 Credit Agreement 2022 [Member] Credit Agreement 2022 2031 Finance Lease, Liability, to be Paid, Year Five Amendment Flag Amendment Flag Net gain on sale of property, plant and equipment Gain (Loss) on Disposition of Property Plant Equipment Accounts receivable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Other Asset Impairment Charges Other Asset Impairment Charges Machinery and equipment Machinery and Equipment [Member] Defined Benefit Plan, Debt Security Defined Benefit Plan, Debt Security [Member] Finance lease expense, cost of sales Finance Lease, Right-of-Use Asset, Amortization Subsequent Events [Abstract] Subsequent Events [Abstract] Supplemental Cash Flow Information Cash Flow, Supplemental Disclosures [Text Block] Actual return on plan assets Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) Sale of Stock, Number of Shares Issued in Transaction Sale of Stock, Number of Shares Issued in Transaction Automotive equipment Vehicles [Member] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Recovery of 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Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Raw material Inventory, Raw Materials, Gross Current provision: Current Income Tax Expense (Benefit), Continuing Operations [Abstract] 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] Proceeds from return of investment on the AVAIL JV Proceeds from Sale, Maturity and Collection of Investments Share-based Payment Arrangement Share-Based Payment Arrangement [Member] Useful life Property, Plant and Equipment, Useful Life Equity Method Investment, Nonconsolidated Investee [Axis] Equity Method Investment, Nonconsolidated Investee [Axis] Accounts payable Increase (Decrease) in Accounts Payable Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Other deferred income tax 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