Non-deductible expenses 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. 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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 Income tax (benefit) expense at federal statutory rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Accounts payable Accounts Payable, Current Unremitted earnings from foreign operations 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) Right-of-use leased assets 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 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] Aug-21 Aug-22 [Member] Aug-22 Deferred income taxes Increase Decrease In Net Deferred Taxes Increase decrease in net deferred taxes. 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[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 Income Tax Beneficiary [Domain] Income Tax Beneficiary [Domain] Income Tax Beneficiary [Domain] Overwrap films Overwrap films [Member] Overwrap films Effect of exchange rate changes on cash Effect of Exchange Rate on Cash and Cash Equivalents Income Statement Location [Axis] Income Statement Location [Axis] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding 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] Research and development tax credit Effective Income Tax Rate Reconciliation, Tax 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Inventories Inventory Disclosure [Text Block] Goodwill Impairment Disclosure [Abstract] Goodwill Impairment Disclosure [Abstract] Goodwill Impairment Disclosure [Abstract] Foreign Currency Forwards Foreign Currency Forwards And Options [Member] Foreign currency forwards an options member. 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Less accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Diluted: Earnings Per Share, Diluted [Abstract] Increase in cash & cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Hedging Relationship [Domain] Hedging Relationship [Domain] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Amount Effective Income Tax Rate Reconciliation, Amount [Abstract] Other Nonoperating Income (Expense), Net - Other Other Nonoperating Income (Expense), Net - Other Other Nonoperating Income (Expense), Net - Other Basic Weighted average shares outstanding used to compute basic earnings per share Weighted Average Number of Shares Outstanding, Basic Unrealized foreign currency translation adjustment (net of tax benefit of $294 in 2021 and net of tax benefit of $19 in 2020) Foreign currency translation adjustment (net of tax benefit of $294) Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Other Nonrecurring Expense Other Nonrecurring Expense Other assets Disposal Group, Including Discontinued Operation, Assets, Noncurrent Cash Flow Hedging [Member] Cash Flow Derivative Hedges Cash Flow Hedging [Member] Equity Method Investment, Ownership Percentage Equity Method Investment, Ownership Percentage May-21 May-22 [Member] May-22 Revenues Revenues Class of Stock [Axis] Class of Stock [Axis] Derivative, Description of Hedged Item Schedule of Derivative Instruments [Table Text Block] Income tax expense (benefit) Income taxes from continuing operations Income Tax Expense (Benefit) Income tax expense (benefit) at effective income tax rate Income Tax Expense (Benefit) Cash, cash equivalents, and restricted cash at beginning of period Cash, cash equivalents, and restricted cash at end of period Cash, cash equivalents, and restricted cash at beginning of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Accrued expenses Accrued Liabilities, Current Aluminum Extrusions Subtotal [Member] Aluminum Extrusions Subtotal [Member] Aluminum Extrusions Subtotal [Member] Earnings Per Share, Diluted Earnings Per Share, Diluted Local Phone Number Local Phone Number Impairment [Abstract] Impairment [Abstract] Impairment [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Commitment Under Cash Flow Hedges, Mass Commitment Under Cash Flow Hedges, Mass Commitment Under Cash Flow Hedges, Mass Trust for Savings Restoration Plan Trust For Saving Restoration Plan [Member] Trust For Saving Restoration Plan. Earnings before interest and taxes (EBIT) Earnings before interest and taxes (EBIT) Earnings before interest and taxes (EBIT) Derivative [Line Items] Derivative [Line Items] Gain (Loss) on Derivative Financial Instruments Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] Depreciation Depreciation Entity Address, Address Line One Entity Address, Address Line One Foreign tax incentives Effective Income Tax Rate Reconciliation, Tax Credit, Amount Energy [Domain] Energy [Domain] Entity Emerging Growth Company Entity Emerging Growth Company EBITDA Projection [Domain] EBITDA Projection [Domain] EBITDA Projection Issued upon exercise of stock options Stock Issued During Period, Value, Stock Options Exercised Disposal Group, Including Discontinued Operation, Other Accrued Expense Disposal Group, Including Discontinued Operation, Other Accrued Expense Disposal Group, Including Discontinued Operation, Other Accrued Expense Derivative Liability, Fair Value, Gross Liability Liability derivatives: Fair Value Derivative Liability, Fair Value, Gross Liability Asset impairments and costs associated with exit and disposal activities, net of adjustments Asset Impairment And Costs Associated With Exit And Disposal Activities - impairment Line Amounts charged against earnings for incurred and estimated one-time, nonrecurring costs assoicated with asset impariments and exit and disposal activities. Unremitted earnings from foreign operations Effective Income Tax Rate Reconciliation Unremitted Earnings From Foreign Operations The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by the difference between statutory income tax rates in foreign jurisdictions and the domestic federal statutory income tax rate on foreign earnings that are not expected to be permanently reinvested in the foreign country. 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