Basis Of Presentation	3 Months Ended
Basis Of Presentation	Mar. 31, 2024
Basis Of Presentation [Abstract]
Basis Of Presentation	In the opinion of management, the accompanying condensed consolidated financial statements of Tredegar Corporation and its subsidiaries (“Tredegar,” “the Company,” “we,” “us” or “our”) contain all adjustments necessary to state fairly, in all material respects, Tredegar’s condensed consolidated financial position as of March 31, 2024, the condensed consolidated results of operations for the three months ended March 31, 2024 and 2023, the condensed consolidated cash flows for the three months ended March 31, 2024 and 2023, and the condensed consolidated changes in shareholders’ equity for the three months ended March 31, 2024 and 2023, in accordance with U.S. generally accepted accounting principles (“GAAP”). All such adjustments, unless otherwise detailed in the notes to the condensed consolidated financial statements, are deemed to be of a normal, recurring nature. The Company operates on a calendar fiscal year except for the Aluminum Extrusions segment, which operates on a 52/53-week fiscal year basis. As such, the fiscal first quarter for 2024 and 2023 for this segment references 13-week periods ended March 31, 2024 and March 26, 2023, respectively. The Company does not believe the impact of reporting the results of this segment as stated above is material to the consolidated financial results. The Company may fund or receive cash from the Aluminum Extrusions segment based on Aluminum Extrusion’s cash flows from operations during the intervening period from Aluminum Extrusion’s fiscal quarter end and the Company’s fiscal quarter end. The condensed consolidated financial statements as of December 31, 2023 that is included herein was derived from the audited consolidated financial statements provided in the Company’s Annual Report on Form 10-K for the year ended December 31, 2023 (“2023 Form 10-K”) but does not include all disclosures required by GAAP. These financial statements should be read in conjunction with the audited consolidated financial statements and related notes included in the 2023 Form 10-K. The results of operations for the three months ended March 31, 2024, are not necessarily indicative of the results to be expected for the full year. Sale of Flexible Packaging Films On September 1, 2023, the Company announced that it had entered into a definitive agreement to sell its Flexible Packaging Films business (also referred to as "Terphane") to Oben Group (the “Contingent Terphane Sale”). Completion of the sale is contingent upon the satisfaction of customary closing conditions, including the receipt of certain competition filing approvals by authorities in Brazil and Colombia. On October 27, 2023, the Company filed the requisite competition forms with the Administrative Council for Economic Defense (“CADE”) in Brazil. The regulatory review process is ongoing and in line with the Company’s expectations. CADE’s maximum deadline for completing its review is no later than November 18, 2024. The merger review regarding the transaction was cleared by the Colombian authority in early February 2024. Closure of PE Films Technical Center In August 2023, the Company adopted a plan to close the PE Films technical center in Richmond, VA and reduce its efforts to develop and sell films supporting the semiconductor market. Future research & development activities for PE Films will be performed at the production facility in Pottsville, PA. PE Films continues to have new business opportunities primarily relating to surface protection films that protect components of flat panel and flexible displays. All activities ceased at the PE Films technical center in Richmond, VA as of the end of the first quarter of 2024. The Company recognized expense incurred through March 31, 2024 associated with the exit activities of $0.2 million for building closure costs. In addition, the Company recognized a non-cash loss on the lease abandonment ($0.3 million). Supply Chain Financing As of March 31, 2024 and December 31, 2023, $8.8 million and $15.8 million, respectively, of the Company’s accounts payable were financed by participating suppliers through third-party financial institutions. Accounting standards not yet adopted