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Recoverable taxes - Summary (Details) - BRL (R$)
R$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of Tax Receivables and Payables [Line Items]      
IRPJ/CSLL – prepayments and withheld taxes R$ 572,825 R$ 227,464  
PIS/COFINS – on acquisitions of property, plant and equipment (1) 76,007 187,126  
PIS/COFINS – operations 707,848 789,667  
PIS/COFINS – exclusions from ICMS (2) 343,981 405,407  
ICMS – on acquisitions of property, plant and equipment (3) 469,771 471,825  
ICMS – operations (4) 1,807,873 1,654,162  
Reintegra program (5) 75,234 70,610  
Other taxes and contributions 133,407 64,444  
Provision for loss on ICMS credits (6) (1,733,630) (1,581,961) R$ (1,452,435)
Tax Assets 2,453,316 2,288,744  
Recoverable taxes 1,488,160 1,109,619  
Recoverable taxes R$ 965,156 R$ 1,179,125