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Loans, financing and debentures - Fundraising cost (Details) - BRL (R$)
R$ in Thousands
 9 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Total    
Disclosure of detailed information about borrowings [line items]    
Cost R$ 1,118,492  
Amortization 602,446  
Balance to be amortized 516,046 R$ 468,488
Bonds    
Disclosure of detailed information about borrowings [line items]    
Cost 422,881  
Amortization 278,737  
Balance to be amortized 144,144 168,450
CRA and NCE    
Disclosure of detailed information about borrowings [line items]    
Cost 65,177  
Amortization  
Balance to be amortized 65,177
Export credits (“export prepayments”)    
Disclosure of detailed information about borrowings [line items]    
Cost 274,830  
Amortization 199,711  
Balance to be amortized 75,119 63,080
Debentures [Member]    
Disclosure of detailed information about borrowings [line items]    
Cost 159,675  
Amortization 40,385  
Balance to be amortized 119,290 125,663
BNDES    
Disclosure of detailed information about borrowings [line items]    
Cost 94,116  
Amortization 58,129  
Balance to be amortized 35,987 25,777
IFC - International Finance Corporation    
Disclosure of detailed information about borrowings [line items]    
Cost 81,956  
Amortization 23,528  
Balance to be amortized 58,428 78,719
Others    
Disclosure of detailed information about borrowings [line items]    
Cost 19,857  
Amortization 1,956  
Balance to be amortized R$ 17,901 R$ 6,799