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Trade accounts receivables - Roll-forward of the expected credit losses (Details) - BRL (R$)
R$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]    
Opening Balance R$ 97,934 R$ 95,053
Closing Balance 104,209 97,934
Trade accounts receivable    
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]    
Opening Balance 30,300 31,962
(Provisions)/Reversals, net (103,502) (2,585)
Utilisation Allowance Account For Credit Losses Financial Assetss 8,145 5,790
Increase Decrease In Allowance Account For Credi tLosses Financial Assets (4,141) 1,543
Closing Balance R$ 121,516 R$ 30,300