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Debt And Credit Agreements (Narrative) (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 06, 2021	Dec. 31, 2023	Dec. 27, 2023	Aug. 03, 2023	Aug. 02, 2023	Dec. 31, 2022
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity			$ 180,000		$ 375,000
Line of Credit, Maximum Borrowing Capacity after Modification		$ 180,000		$ 200,000
Line of Credit, Maximum Borrowing Capacity after ABL Adjustment Date		125,000
Available credit under the Credit Agreement		22,900
Short-Term Debt		126,322				$ 0
Letters of Credit Outstanding, Amount		13,100
Debt Issuance Costs, Gross		$ 2,600
Debt Instrument, Basis Spread on Variable Rate		5.99%
Cash Dominion Availability after ABL Adjustment Date		12.50%
Minimum Liquidity under ABL Facility		$ 10,000
Minimum Availability before ABL Adjustment Date		10.00%
Minimum Availability after ABL Adjustment Date		20.00%
Debt Instrument, Interest Rate, Stated Percentage		5.36%
Debt Instrument, Periodic Payment, Principal		$ 1,700
Terphane Brazil Loan
Line of Credit Facility [Line Items]
Other Borrowings		20,000
Tredegar Intercompany
Line of Credit Facility [Line Items]
Other Borrowings		$ 20,000
Line of Credit | Adjusted Base Rate
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	3.50%
Line of Credit | Alternate Base Rate
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.50%

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Cash Dominion Availability after ABL Adjustment Date

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Line of Credit, Maximum Borrowing Capacity after ABL Adjustment Date

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Line of Credit, Maximum Borrowing Capacity after Modification

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Minimum Availability before ABL Adjustment Date

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- Definition

Minimum Liquidity under ABL Facility

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of the required periodic payments applied to principal.

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- Definition

Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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- Definition

The carrying amount as of the balance sheet date for the aggregate of other miscellaneous borrowings owed by the reporting entity.

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- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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