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 |