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General information about financial statements (Details) - item
Dec. 31, 2025
Sep. 30, 2025
BRAZIL | Fibria    
Company's Operations [Line Items]    
Number of Ports   4
BRAZIL    
Company's Operations [Line Items]    
Number of Technology Centers   4,000
Number of Distribution Centers   29
BRAZIL | Suzano Industrial    
Company's Operations [Line Items]    
Number of Industrial Units 14  
State of Sao Paulo | Suzano Industrial    
Company's Operations [Line Items]    
Number of Industrial Units 2