Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount Total revenues, net of other expenses Total Revenues Net Of Other Expenses Total sales, net of returns, allowances and discounts, plus other non-operating income and expenses. Restatement [Axis] Revision of Prior Period [Axis] Document Type Document Type Receivable Type [Axis] Receivable Type [Axis] Other income (expense), net Other income (expense), net Other Nonoperating Income (Expense) Effective Income Tax Rate Reconciliation - U.S. Tax on Foreign Branch Income - Percentage Effective Income Tax Rate Reconciliation - U.S. Tax on Foreign Branch Income - Percentage Effective Income Tax Rate Reconciliation - U.S. Tax on Foreign Branch Income - Percentage Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year Disposal Group, Including Discontinued Operation, Other Expense Disposal Group, Including Discontinued Operation, Other Expense Interest expense Interest expense Interest and Debt Expense Accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities BrazilianTaxCreditDeductionPeriod BrazilianTaxCreditDeductionPeriod Brazilian Tax Credit Deduction Period Segments [Axis] Segments [Axis] Pension And Other Post-Retirement Benefits Retirement Benefits [Text Block] Derivative financial instruments adjustment Derivative financial instruments adjustment (net of tax of $547) Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax Cost of goods sold Schedule Of After-Tax Changes In Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] CHINA CHINA Other Other Accrued Expenses [Member] Other Accrued Expenses [Member] Investment in kaleo Investment in kaleo Investment in kaleo Total Segment Income (Loss) Total Income Loss Associated With Segments Total income and loss before income expenses associated with a specific segment. Includes income/loss from ongoing operations; plant shutdowns, asset impairments, restructurings and other non-recurring charges; and goodwill impairment charges. Statistical Measurement [Domain] Statistical Measurement [Domain] Liabilities and Shareholders’ Equity Liabilities and Equity [Abstract] Effective Income Tax Rate Reconciliation, Tax Contingency, Amount Effective Income Tax Rate Reconciliation, Tax Contingency, Amount Futura [Member] Futura [Member] Futura [Member] Oct-21 Oct-21 [Member] Oct-21 Derivative Financial Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Derivative Instruments and Hedging Activities Disclosure [Text Block] Aluminum Extrusions [Member] Aluminum Extrusions [Member] Aluminum Extrusions [Member] Aluminum Extrusions Member. Gain (loss) on derivative financial instruments Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax Security Exchange Name Security Exchange Name Energy [Axis] Energy [Axis] Intangible Assets, Net (Excluding Goodwill) Intangible Assets, Net (Excluding Goodwill) Effective income tax rate reconciliation social contribution on income Effective income tax rate reconciliation social contribution on income Effective income tax rate reconciliation social contribution on income. Accounts and other receivables Increase (Decrease) in Accounts and Other Receivables Increase (Decrease) in Accounts and Other Receivables Payments of Debt Issuance Costs Payments of Debt Issuance Costs Capital Expenditure, Discontinued Operations Capital Expenditure, Discontinued Operations Total current liabilities Liabilities, Current Reclassification out of Accumulated Other Comprehensive Income [Member] Reclassification Out Of Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income [Member] Prepaid expenses and other Prepaid Expense and Other Assets, Current Variable Rate [Domain] Variable Rate [Domain] Variable Rate [Axis] Variable Rate [Axis] Aluminum Futures Contracts [Member] Aluminum Futures Contracts Aluminum Futures Contracts [Member] Aluminum futures contracts. Commitments and Contingencies Commitments and Contingencies Repurchase of employee common stock for tax withholdings Share-based Payment Arrangement, Decrease for Tax Withholding Obligation Assets Assets [Abstract] Income taxes payable Taxes Payable, Current Entity Address, State or Province Entity Address, State or Province Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Accounts payable Accounts Payable, Current Deferred Tax Benefit Expense Valuation Allowance Adj Capital Loss Carryforwards Deferred Tax Benefit Expense Valuation Allowance Adj Capital Loss Carryforwards Deferred tax expense (benefit) related to a valuation allowance associated with previously recorded capital losses on certain investments Effective Income Tax Rate Reconciliation Unremitted Earnings From Foreign Operations, Amount Effective Income Tax Rate Reconciliation Unremitted Earnings From Foreign Operations, Amount Effective Income Tax Rate Reconciliation Unremitted Earnings From Foreign Operations, Amount Effective Income Tax Rate Reconciliation Unremitted Earnings From Foreign Operations, Amount Comprehensive Income (Loss) Note [Text Block] Comprehensive Income (Loss) Note [Text Block] Retained earnings Retained Earnings (Accumulated Deficit) Operating Lease, Right-of-Use Asset Operating Lease, Right-of-Use Asset Tredegar common stock purchased by trust for savings restoration plan Tredegar Common Stock Purchased by Trust for Savings Restoration Plan Tredegar Common Stock Purchased By Trust For Savings Restoration Plan Jul-21 Jul-21 [Member] Jul-21 EBITDA Multiple Method for Fair Value Estimate [Member] EBITDA Multiple Method for Fair Value Estimate [Member] EBITDA Multiple Method for Fair Value Estimate [Member] DCF Method for Fair Value Estimate [Member] DCF Method for Fair Value Estimate [Member] DCF Method for Fair Value Estimate [Member] Deferred income taxes Increase Decrease In Net Deferred Taxes Increase decrease in net deferred taxes. Customer [Axis] Customer [Axis] CANADA CANADA Feb-20 [Member] [Member] Feb-20 [Member] [Member] Feb-20 [Member] [Member] Continuing operations Income (Loss) from Continuing Operations, Per Diluted Share Hedging Designation [Domain] Hedging Designation [Domain] Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share Discontinued operations Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax [Abstract] Other Comprehensive Income (Loss), Net of Tax [Abstract] Automotive [Member] Automotive [Member] Automotive [Member] [Member] Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Basis Of Presentation [Abstract] Basis Of Presentation [Abstract] Basis Of Presentation [Abstract] Other non-current liabilities Other Liabilities, Noncurrent Deferred Income Tax Assets, Net Deferred Income Tax Assets, Net Proceeds from the sale of assets and other Payments for (Proceeds from) Other Investing Activities Costs and expenses: Cost of Revenue [Abstract] Sep-19 [Member] Sep-19 [Member] Sep-19 [Member] BRAZIL Brazil BRAZIL Jan-21 Jan-21 [Member] Jan-21 Inventories Total Inventory, Net Aug-20 [Member] [Member] Aug-20 [Member] [Member] Aug-20 [Member] [Member] Amortization Of Prior Service Costs And Net Gains Loss Actuarial gain (loss) and prior service costs, before taxes Amortization of prior service costs, (gains) losses and net transition asset Amortization Of Prior Service Costs And Net Gains Loss Amortization Of Prior Service Costs And Net Gains Loss Geographical [Domain] Geographical [Domain] Alleghany and Bath County, Virginia [Member] Alleghany and Bath County, Virginia [Member] Alleghany and Bath County, Virginia Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Axis] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Feb-21 Feb-21 [Member] Feb-21 Statement [Line Items] Statement [Line Items] Class of Stock [Domain] Class of Stock [Domain] (Gain) loss on investment in kaléo accounted for under the fair value method Gain (loss) on investment in kaléo accounted for under fair value method Unrealized Gain (Loss) on Investments Borrowings Proceeds from Long-term Lines of Credit Contract with Customer, Duration [Domain] Contract with Customer, Duration [Domain] Measurement Input Type [Domain] Measurement Input Type [Domain] Statement [Table] Statement [Table] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Carrying value Investment Owned, at Fair Value Schedule of Trade Name Accelerated Amortization [Table Text Block] Schedule of Trade Name Accelerated Amortization [Table Text Block] [Table Text Block] for Schedule of Trade Name Accelerated Amortization [Table] Other Comprehensive Income, Other, Net of Tax Other Comprehensive Income, Other, Net of Tax Interest cost Defined Benefit Plan, Interest Cost Statistical Measurement [Axis] Statistical Measurement [Axis] Disposal Group, Including Discontinued Operation, Gross Profit (Loss) Disposal Group, Including Discontinued Operation, Gross Profit (Loss) Common stock, no par value Common Stock, No Par Value Type of Restructuring [Domain] Type of Restructuring [Domain] Debt principal payments Repayments of Long-term Lines of Credit Industry Sector [Axis] Industry Sector [Axis] Sep-20 [Member] [Member] Sep-20 [Member] [Member] Sep-20 [Member] [Member] INDIA INDIA Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Percent Foreign tax incentives Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Percent Retirement Plan Tax Status [Domain] Retirement Plan Tax Status [Domain] Retirement Plan Name [Domain] Retirement Plan Name [Domain] Foreign Tax Credit - Brazil Foreign Tax Credit - Brazil Foreign Tax Credit - Brazil effective income tax rate reconciliation, valuation allowance due to foreign losses effective income tax rate reconciliation, valuation allowance due to foreign losses effective income tax rate reconciliation, valuation allowance due to foreign losses HUNGARY HUNGARY Retirement Plan Funding Status [Domain] Defined Benefit Plan, Funding Status [Domain] Dec-19 [Member] Dec-19 [Member] Dec-19 [Member] Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Percent Domestic production activities deduction Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Percent Apr-20 [Member] [Member] Apr-20 [Member] [Member] Apr-20 [Member] [Member] Latin America [Member] Latin America [Member] Brazil One-time Tax Credit PIS/COFINS Receivable Brazil One-time Tax Credit PIS/COFINS Receivable Brazil One-time Tax Credit PIS/COFINS Receivable Accounts Receivable, before Allowance for Credit Loss Accounts Receivable, before Allowance for Credit Loss EBITDA Plant Shutdowns, Asset Impairments, Restructuring And Other Gains or losses associated with plant shutdowns, asset impairments and restructurings, gains or losses from the sale of assets, goodwill impairment losses and other non-recurring items which are not associated with the ongoing operations of a segment. Investment Income, Dividend Investment Income, Dividend Disposal Group, Including Discontinued Operation, Revenue Disposal Group, Including Discontinued Operation, Revenue Other Nonoperating Income (Expense), Net - Total Other Nonoperating Income (Expense), Net - Total Other Nonoperating Income (Expense), Net - Total Selling, General and Administrative Expenses [Member] Selling, General and Administrative Expenses [Member] Effective Income Tax Rate Reconciliation Operating Loss Carryforwards Valuation Allowance For Foreign Country Valuation allowance for foreign operating loss carry-forwards Effective Income Tax Rate Reconciliation Operating Loss Carryforwards Valuation Allowance For Foreign Country The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by the operating loss carry-forward valuation allowances for foreign countries. Type of Borrower [Axis] Type of Borrower [Axis] Amendment Flag Amendment Flag Percentage of Coverage Using Cash Flow Hedges Percentage of Coverage Using Cash Flow Hedges Percentage of Coverage Using Cash Flow Hedges Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Operating Leases, Future Minimum Payments Due Operating Leases, Future Minimum Payments Due Total cash invested in private company Tax Basis of Investments, Cost for Income Tax Purposes Income taxes recoverable/payable Increase (Decrease) in Income Taxes Payable, Net of Income Taxes Receivable Accounts Receivable, Change in Method, Credit Loss Expense (Reversal) Accounts Receivable, Change in Method, Credit Loss Expense (Reversal) Disposal Group, Including Discontinued Operation, Costs of Goods Sold Disposal Group, Including Discontinued Operation, Costs of Goods Sold Goodwill, Impairment Loss, Net of Tax Goodwill, Impairment Loss, Net of Tax Foreign Currency Exchange Rate, Translation Foreign Currency Exchange Rate, Translation Net Cash Provided by (Used in) Operating Activities Net Cash Provided by (Used in) Operating Activities Billing Status, Type [Axis] Billing Status, Type [Axis] Effective Tax Rate Reconciliation Worthless Stock Effective Tax Rate Reconciliation Worthless Stock Effective Tax Rate Reconciliation Worthless Stock Residential Building And Construction [Member] Residential Building And Construction [Member] Residential Building And Construction [Member] Entity Central Index Key Entity Central Index Key General corporate General Corporate Assets General corporate assets. 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] Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent Common Stock, Shares Held in Employee Trust, Shares Common Stock, Shares Held in Employee Trust, Shares Derivative Instrument [Axis] Derivative Instrument [Axis] Operations Outside United States [Member] Operations Outside United States [Member] Operations Outside The United States [Member] Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Brazilian Tax Holiday Incentive Period Brazilian Tax Holiday Incentive Period Brazilian Tax Holiday Incentive Period Income Taxes Receivable, Current Income Taxes Receivable, Current Contract with Customer, Sales Channel [Domain] Contract with Customer, Sales Channel [Domain] Geographical [Axis] Geographical [Axis] Schedule of Trade Name Accelerated Amortization [Table] Schedule of Trade Name Accelerated Amortization [Table] Schedule of Trade Name Accelerated Amortization [Table] Contract with Customer, Duration [Axis] Contract with Customer, Duration [Axis] Effective Income Tax Rate Reconciliation, Deduction, Percent Effective Income Tax Rate Reconciliation, Deduction, Percent Segments [Domain] Segments [Domain] Segment [Domain] Segments [Domain] Film Products Foreign Currency Contract Forward Contract Film Products Foreign Currency Contract Forward Contract [Member] Film Products Foreign Currency Contract Forward Contract [Member] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Weighting of EBITDA Multiple Method versus DCF Method Weighting of EBITDA Multiple Method versus DCF Method Weighting of EBITDA Multiple Method versus DCF Method Nov-18 [Member] Nov-18 [Member] Nov-18 [Member] Income Tax Beneficiary [Domain] Income Tax Beneficiary [Domain] Income Tax Beneficiary [Domain] Effect of exchange rate changes on cash Effect of Exchange Rate on Cash and Cash Equivalents Income Statement Location [Axis] Income Statement Location [Axis] Accounts and other receivables, allowance for doubtful accounts and sales returns Accounts Receivable, Allowance for Credit Loss, Current Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Current Effective Tax Rate Excluding Social Contribution On Income Current Effective Tax Rate Excluding Social Contribution On Income Current Effective Tax Rate Excluding Social Contribution On Income Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Percent Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Percent Income Statement Location [Domain] Income Statement and Other Comprehensive Income (Loss) Location [Domain] Income Statement Location [Domain] Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount Jun-19 [Member] Jun-19 [Member] Jun-19 [Member] Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Selling, general and administrative Selling, General and Administrative Expense Mar-21 Mar-21 [Member] Mar-21 Derivative, Notional Amount Derivative, Notional Amount Amortization of identifiable intangibles Amortization of Intangible Assets Operating profit from ongoing operations Income Loss From Ongoing Operations Operating income for the period associated with the ongoing operations of the segment and excluding gains or losses associated with plant shutdowns, asset impairments and restructurings, gains or losses from the sale of assets and other items and goodwill impairment charges. Apr-19 [Member] Apr-19 [Member] Apr-19 [Member] Net asset (liability), Fair Value Net asset (liability), Fair Value Derivative, Fair Value, Net Foreign Currency Forward Contracts [Member] Foreign Currency Forward Contracts Foreign Currency Forward Contracts [Member] Foreign Currency Forward Contracts [Member] Other assets Other Assets, Noncurrent Cash Flow Hedge Maturity Date [Axis] Cash Flow Hedge Maturity Date [Axis] Cash Flow Hedge Maturity Date [Axis] Segment Reporting Segment Reporting Disclosure [Text Block] Receivables, Net, Current Receivables, Net, Current Net income (loss) from continuing operations Income from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Total assets Assets Scenario [Axis] Scenario [Axis] Schedule Of Reclassifications Of Balances Out Of Accumulated Other Comprehensive Income (Loss) Into Net Income Schedule Of Reclassifications Of Balances Out Of Accumulated Other Comprehensive Income (Loss) Into Net Income [Table Text Block] Schedule Of Reclassifications Of Balances Out Of Accumulated Other Comprehensive Income (Loss) Into Net Income [Table Text Block] Title of 12(b) Security Title of 12(b) Security Increase In Value Of kaléo Investment Held Abroad, Percentage Increase In Value Of kaléo Investment Held Abroad, Percentage Increase In Value Of kaléo Investment Held Abroad, Percentage Retirement Plan Sponsor Location [Axis] Retirement Plan Sponsor Location [Axis] Contract with Customer, Basis of Pricing [Axis] Contract with Customer, Basis of Pricing [Axis] Disposal Group, Including Discontinued Operation, Operating Income (Loss) Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax Industry of Counterparty, Type [Axis] Industry of Counterparty, Type [Axis] Jun-21 Jun-21 [Member] Jun-21 Geographic Distribution [Axis] Geographic Distribution [Axis] Investments, Debt and Equity Securities [Abstract] Cost of Sales [Member] Cost of Sales [Member] Cost Of Sales Cost of Sales [Member] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Axis] ASC 840 2018 Minimum Lease Payments Table [Abstract] ASC 840 2018 Minimum Lease Payments Table [Abstract] ASC 840 2018 Minimum Lease Payments Table [Abstract] Disposal Group, Including Discontinued Operation, Deferred Assets Disposal Group, Including Discontinued Operation, Deferred Assets Disposal Group, Including Discontinued Operation, Deferred Assets Reduction of right-of-use lease asset Amortization of Leased Asset Mergers, Acquisitions and Dispositions Disclosures Mergers, Acquisitions and Dispositions Disclosures [Text Block] Depreciation, Depletion and Amortization Depreciation, Depletion and Amortization Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Amount Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Amount Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] Product and Service [Axis] Product and Service [Axis] Total liabilities Liabilities Total net sales Sales Net Sales Aggregrate revenue during the period from the sales of goods in the normal course of business, after deducting returns, allowances, discounts, and charges for outbound freight. Unrealized Gain (Loss) on Investments - kaleo Unrealized Gain (Loss) on Investments - kaleo Unrealized Gain (Loss) on Investments - kaleo Sales [Member] Sales [Member] Apr-21 Apr-21 [Member] Apr-21 Investments and Other Noncurrent Assets Investments and Other Noncurrent Assets [Text Block] Retirement Plan Tax Status [Axis] Retirement Plan Tax Status [Axis] Disposal Group, Including Discontinued Operation, Prepaid and Other Assets, Current Disposal Group, Including Discontinued Operation, Prepaid and Other Assets, Current Other Restructuring [Member] Other Restructuring [Member] Retirement Plan Type [Axis] Retirement Plan Type [Axis] Jan-20 [Member] [Member] Jan-20 [Member] [Member] Jan-20 [Member] [Member] Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] Lessee, Operating Lease, Liability, Undiscounted Excess Amount Lessee, Operating Lease, Liability, Undiscounted Excess Amount Effective Income Tax Rate Reconciliation Deduction For Foreign Investment Adjustments Effective Income Tax Rate Reconciliation Deduction For Foreign Investment Adjustments Effective Income Tax Rate Reconciliation Deduction For Foreign Investment Adjustments Effective Income Tax Rate Reconciliation Deduction For Foreign Investment Adjustments Disposal Group, Including Discontinued Operation, Assets Disposal Group, Including Discontinued Operation, Carrying Value of Assets before Valuation Allowance Disposal Group, Including Discontinued Operation, Carrying Value of Assets before Valuation Allowance Position [Domain] Position [Domain] Electrical [Member] Electrical [Member] Electrical [Member] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Inventories Increase (Decrease) in Inventories Increase (Decrease) in Inventories Legal Entity Type of Counterparty [Domain] Legal Entity Type of Counterparty [Domain] Earnings before interest, taxes, depreciation and amortization (EBITDA) Earnings before interest, taxes, depreciation and amortization (EBITDA) Earnings before interest, taxes, depreciation and amortization (EBITDA) AACOA Aacoa [Member] AACOA [Member] Mar-19 [Member] Mar-19 [Member] Mar-19 [Member] Raw materials Inventory, Raw Materials, Net of Reserves Current Effective Tax Rate Reconciliation Social Contribution On Income Current Effective Tax Rate Reconciliation Social Contribution On Income Current Effective Tax Rate Reconciliation Social Contribution On Income Disposal Group, Including Discontinued Operation, Accrued Expenses Disposal Group, Including Discontinued Operation, Accrued Expenses Disposal Group, Including Discontinued Operation, Accrued Expenses Timing of Transfer of Good or Service [Domain] Timing of Transfer of Good or Service [Domain] Common Stock, Dividends, Per Share, Cash Paid Common Stock, Dividends, Per Share, Cash Paid Effective Income Tax Rate Reconciliation Capital Loss Carryforwards Valuation Allowance, Amount Effective Income Tax Rate Reconciliation Capital Loss Carryforwards Valuation Allowance, Amount Effective Income Tax Rate Reconciliation Capital Loss Carryforwards Valuation Allowance, Amount Schedule of Other Nonoperating Income (Expense) [Table Text Block] Schedule of Other Nonoperating Income (Expense) [Table Text Block] Other, net Other Operating Activities, Cash Flow Statement Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Payment for Contingent Consideration Liability, Investing Activities Payment for Contingent Consideration Liability, Investing Activities Accounts Receivable, before Allowance for Credit Loss, Current Accounts Receivable, before Allowance for Credit Loss, Current Continuing operations Income (Loss) from Continuing Operations, Per Basic Share Surface Protection Films [Member] Surface Protection Films [Member] Surface Protection Films [Member] Effective Income Tax Rate Reconciliation, Deduction, Dividends, Amount Effective Income Tax Rate Reconciliation, Deduction, Dividends, Amount Aug-21 Aug-21 [Member] Aug-21 Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate Depreciation and Amortization, Discontinued Operations Depreciation and Amortization, Discontinued Operations Other Receivables Other Receivables Common stock, shares outstanding Common Stock, Shares, Outstanding Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Schedule Of Pretax Effect On Net Income (Loss) And Other Comprehensive Income (Loss) Of Derivative Instruments Classified As Cash Flow Hedges Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) [Table Text Block] Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Income (loss) from continuing operations before income taxes Income (loss) from continuing operations before income taxes Income before income taxes Income from continuing operations before income taxes Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Adjustments for noncash items: Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Research and development Research and Development Expense Cash Flow Hedge Maturity Date [Domain] Cash Flow Hedge Maturity Date [Domain] [Domain] for Cash Flow Hedge Maturity Date [Axis] Other Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Films For Other Markets [Member] Films For Other Markets [Member] Films For Other Markets [Member] Disposal Group, Including Discontinued Operation, Operating Expense Disposal Group, Including Discontinued Operation, Operating Expense Income Taxes [Table] Income Taxes [Table] Income Taxes [Table] Acquisition, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Concentration Risk Type [Axis] Concentration Risk Type [Axis] Incremental dilutive shares attributable to stock options and restricted stock Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Property, plant and equipment, at cost Property, Plant and Equipment, Gross kaleo [Member] kaleo kaleo [Member] kaleo [Member] Assets Held-for-sale, Not Part of Disposal Group Assets Held-for-sale, Not Part of Disposal Group Schedule Of Segment Reporting Information By Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Effective Income Tax Rate Reconciliation Deduction For Divestiture Of Subsidiary Stock Effective Income Tax Rate Reconciliation Deduction For Divestiture Of Subsidiary Stock Effective income tax rate reconciliation deduction for divestiture of subsidiary stock. Effective Income Tax Rate Reconciliation, Deduction, Amount Effective Income Tax Rate Reconciliation, Deduction, Amount Effective Income Tax Rate Reconciliation, Deduction, Amount Effective Income Tax Rate Reconciliation, Deduction, Amount Income Statement [Abstract] Income Statement [Abstract] Gain (Loss) on Disposition of Assets Gain (Loss) on Disposition of Assets Liability, Pension and Other Postretirement and Postemployment Benefits, Noncurrent Liability, Pension and Other Postretirement and Postemployment Benefits, Noncurrent Operating Lease, Liability, Noncurrent Operating Lease, Liability, Noncurrent Prepaid expenses and other Increase (Decrease) in Prepaid Expense and Other Assets Increase (Decrease) in Prepaid Expense and Other Assets Operating Leases, Rent Expense Operating Leases, Rent Expense Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Amount of pretax gain (loss) recognized in other comprehensive income (loss) Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax Cash Provided by (Used in) Operating Activities, Discontinued Operations Cash Provided by (Used in) Operating Activities, Discontinued Operations PE Films [Member] PE Films PE Films [Member] PE Films Member. Research and development tax credit Effective Income Tax Rate Reconciliation, Tax Credit, Research, Percent Effective Income Tax Rate Reconciliation, Tax Contingency, Percent Income tax contingency accruals and tax settlements Effective Income Tax Rate Reconciliation, Tax Contingency, Percent Current assets: Assets, Current [Abstract] Shares used to compute earnings (loss) per share: Shares Used To Compute Earnings Loss Per Share [Abstract] Shares Used To Compute Earnings Loss Per Share. Interest income Investment Income, Interest Cash, Cash Equivalents and Restricted Cash Reconciliation Table [Abstract] Cash, Cash Equivalents and Restricted Cash Reconciliation Table [Abstract] Cash, Cash Equivalents and Restricted Cash Reconciliation Table [Abstract] Brazilian [Member] Brazilian [Member] Brazilian [Member] Income Tax Authority [Domain] Income Tax Authority [Domain] Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Percent Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Percent Effective Income Tax Rate Reconciliation Federal Statutory Tax Rate Excluding Social Contribution On Income Effective Income Tax Rate Reconciliation Federal Statutory Tax Rate Excluding Social Contribution On Income Effective Income Tax Rate Reconciliation Federal Statutory Tax Rate Excluding Social Contribution On Income Subsegments [Domain] Subsegments [Domain] Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive Income (Loss), Net of Tax, Attributable to Parent Disposal Group, Including Discontinued Operation, Asset Impairment Disposal Group, Including Discontinued Operation, Asset Impairment Disposal Group, Including Discontinued Operation, Asset Impairment Schedule Of Effective Income Tax Rate For Continuing Operations Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Exports From United States [Member] Exports From United States [Member] Exports From The United States [Member] Collateral Held [Axis] Collateral Held [Axis] Film Products Subtotal [Member] Film Products Subtotal [Member] Film Products Subtotal [Member] Scenario [Domain] Scenario [Domain] Counterparty Name [Domain] Counterparty Name [Domain] Capital expenditures Payments to Acquire Property, Plant, and Equipment Legal Entity [Axis] Legal Entity [Axis] Legal Entity [Axis] City Area Code City Area Code Consolidation Items [Domain] Consolidation Items [Domain] NETHERLANDS NETHERLANDS Cost-method Investments, Other than Temporary Impairment Cost-method Investments, Other than Temporary Impairment Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount Income Tax Authority [Axis] Income Tax Authority [Axis] Oct-19 [Member] Oct-19 [Member] Oct-19 [Member] Document Period End Date Document Period End Date Harbinger Capital Partners Special Situations Fund Harbinger Capital Partners Special Situations Fund [Member] Harbinger Capital Partners Special Situations Fund Operating Leases, Rent Expense Operating Leases, Rent Expense Short-term Lease Payments Disaggregation of Revenue [Table Text Block] Disaggregation of Revenue [Table Text Block] Amounts reclassified from accumulated other comprehensive income (loss) Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Hedging Designation [Axis] Hedging Designation [Axis] Amortization of prior service costs and net gains or losses, tax Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Aug-19 [Member] Aug-19 [Member] Aug-19 [Member] Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] Goodwill, Impaired, Accumulated Impairment Loss Goodwill, Impaired, Accumulated Impairment Loss Schedule of Inventory, Current Schedule of Inventory, Current [Table Text Block] Entity [Domain] Entity [Domain] Entity [Domain] Payment, Tax Withholding, Share-based Payment Arrangement Payment, Tax Withholding, Share-based Payment Arrangement Derivatives Designated As Hedging Instruments [Member] Designated as Hedging Instrument [Member] Measurement Input Type [Axis] Measurement Input Type [Axis] Businesss Combination Settlement of Escrow Account Businesss Combination Settlement of Escrow Account Businesss Combination Settlement of Escrow Account Income Tax Holiday, Income Tax Benefits Per Share Income Tax Holiday, Income Tax Benefits Per Share Sep-21 Sep-21 [Member] Sep-21 Foreign Currency Forwwards And Options [Member] Foreign Currency Forwards And Options Foreign Currency Forwwards And Options [Member] Foreign Currency Forwwards And Options. 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