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Document And Entity Information (Details)	12 Months Ended
	Dec. 31, 2021
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Entity Registrant Name	TREDEGAR CORPORATION
Amendment Flag	false
Entity Central Index Key	0000850429
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Auditor Firm ID	185
Auditor Location	Richmond, Virginia
Auditor Name	KPMG LLP
Document Period End Date	Dec. 31, 2021
Document Fiscal Year Focus	2021

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