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Document and Entity Information
Jun. 29, 2022
Cover [Abstract]  
Entity Registrant Name TREDEGAR CORP
Amendment Flag false
Entity Central Index Key 0000850429
Document Type 8-K
Document Period End Date Jun. 29, 2022
Entity Incorporation State Country Code VA
Entity File Number 1-10258
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
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common
Trading Symbol TG
Security Exchange Name NYSE
Entity Emerging Growth Company false