Basis Of Presentation	3 Months Ended
Basis Of Presentation	Mar. 31, 2023
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, 2023, the condensed consolidated results of operations for the three months ended March 31, 2023 and 2022, the condensed consolidated cash flows for the three months ended March 31, 2023 and 2022, and the condensed consolidated changes in shareholders’ equity for the three months ended March 31, 2023 and 2022, 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 2023 and 2022 for this segment references 13-week periods ended March 26, 2023 and March 27, 2022, 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. There was no intercompany funding with Aluminum Extrusions between March 26, 2023 and March 31, 2023. The condensed consolidated financial statements as of December 31, 2022 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, 2022 (“2022 Form 10-K”) but does not include all disclosures required by GAAP. These financial statements should be read in conjunction with the consolidated financial statements and related notes included in the 2022 Form 10-K. The results of operations for the three months ended March 31, 2023, are not necessarily indicative of the results to be expected for the full year. Impairment of Goodwill and Long-Lived Assets The Company assesses goodwill for impairment when events or circumstances indicate that the carrying value may not be recoverable, or, at a minimum, on an annual basis (December 1st of each year). In addition, the Company reviews long-lived assets for possible impairment when events indicate that an impairment may exist. As of March 31, 2023, the Company’s reporting units with goodwill were Surface Protection in PE Films and Futura in Aluminum Extrusions. No events or circumstances were identified during the first quarter of 2023 that indicate that it is not more likely than not that the fair values of each reporting unit was less than its carrying amount. The valuation of both goodwill and long-lived assets depends on a variety of factors, including macroeconomic conditions, industry and market considerations, cost factors and overall financial performance. Failure to successfully achieve projections could result in future impairments. Furthermore, impairment to the Surface Protection reporting unit, which is also the asset group, may be caused by factors outside the Company’s control, such as increasing competitive pricing pressures, weak consumer electronic market demand, lower than expected sales and profit growth rates, and various other factors. Consumer demand for electronics has significantly softened, causing manufacturers in the supply chain to experience reduced capacity utilization and inventory corrections. In addition, these market conditions are adversely impacting mix through reduced sales to Surface Protection’s highest value-added customers and products. Given the uncertain demand for Surface Protections products, it is reasonably possible that the cash flow estimates used in deriving such impairment valuations may change in the future. As of March 31, 2023, the Surface Protection reporting unit had goodwill of $57.3 million and long-lived identifiable assets of $28.5 million. Accounting Standards Adopted No Accounting Standard Updates issued by the Financial Accounting Standards Board were adopted during the first quarter of 2023.