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Cover - USD ($)
 12 Months Ended
Dec. 31, 2023
Mar. 08, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2023    
Entity File Number 1-10258    
Entity Registrant Name TREDEGAR CORPORATION    
Entity Address, State or Province VA    
Entity Tax Identification Number 54-1497771    
Entity Address, Address Line One 1100 Boulders Parkway,    
Entity Address, City or Town Richmond,    
Entity Address, State or Province VA    
Entity Address, Postal Zip Code 23225    
City Area Code 804    
Local Phone Number 330-1000    
Title of 12(b) Security Common Stock    
Trading Symbol TG    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 278,307,771
Entity Common Stock, Shares Outstanding   34,430,769  
Documents Incorporated by Reference
Portions of the Tredegar Corporation Proxy Statement for the 2024 Annual Meeting of Shareholders (the “Proxy Statement”) are incorporated by reference into Part III of this Form 10-K.
    
Amendment Flag false    
Entity Central Index Key 0000850429    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2023    
Entity Small Business false    
Entity Emerging Growth Company false    
Document Fiscal Period Focus (Q1,Q2,Q3,FY) FY