v3.26.1
FAIR VALUE MEASUREMENTS (Details) - EBP 002 - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
EBP, Investment, Fair Value and NAV [Line Items]      
Total investments $ 155,157,331 $ 133,919,803  
Redemption, notice period 5 days 5 days  
Fair Value, Inputs, Level 1, Level 2, and Level 3      
EBP, Investment, Fair Value and NAV [Line Items]      
Total investments $ 153,236,548 $ 131,743,458  
Level 1      
EBP, Investment, Fair Value and NAV [Line Items]      
Total investments 153,236,548 131,743,458  
Money market fund      
EBP, Investment, Fair Value and NAV [Line Items]      
Total investments 1,667,814 1,916,826  
Money market fund | Fair Value, Inputs, Level 1, Level 2, and Level 3      
EBP, Investment, Fair Value and NAV [Line Items]      
Total investments 1,667,814 1,916,826  
Money market fund | Level 1      
EBP, Investment, Fair Value and NAV [Line Items]      
Total investments 1,667,814 1,916,826  
Mutual funds      
EBP, Investment, Fair Value and NAV [Line Items]      
Total investments 142,541,848 120,806,330  
Mutual funds | Fair Value, Inputs, Level 1, Level 2, and Level 3      
EBP, Investment, Fair Value and NAV [Line Items]      
Total investments 142,541,848 120,806,330  
Mutual funds | Level 1      
EBP, Investment, Fair Value and NAV [Line Items]      
Total investments 142,541,848 120,806,330  
Tredegar Corporation common stock      
EBP, Investment, Fair Value and NAV [Line Items]      
Total investments 4,125,772 4,915,044 $ 3,800,985
Tredegar Corporation common stock | Fair Value, Inputs, Level 1, Level 2, and Level 3      
EBP, Investment, Fair Value and NAV [Line Items]      
Total investments 4,125,772 4,915,044  
Tredegar Corporation common stock | Level 1      
EBP, Investment, Fair Value and NAV [Line Items]      
Total investments 4,125,772 4,915,044  
Self-directed brokerage account      
EBP, Investment, Fair Value and NAV [Line Items]      
Total investments 4,901,114 4,105,258  
Self-directed brokerage account | Fair Value, Inputs, Level 1, Level 2, and Level 3      
EBP, Investment, Fair Value and NAV [Line Items]      
Total investments 4,901,114 4,105,258  
Self-directed brokerage account | Level 1      
EBP, Investment, Fair Value and NAV [Line Items]      
Total investments 4,901,114 4,105,258  
Common collective trust      
EBP, Investment, Fair Value and NAV [Line Items]      
Total investments 1,920,783 2,176,345  
Common collective trust | Investments measured at NAV      
EBP, Investment, Fair Value and NAV [Line Items]      
Total investments $ 1,920,783 $ 2,176,345