Recoverable taxes - Roll-forward of provision for loss (Details) - BRL (R$) R$ in Thousands |
9 Months Ended | 12 Months Ended |
|---|---|---|
Sep. 30, 2025 |
Dec. 31, 2024 |
|
| Recoverable Taxes [Abstract] | ||
| Opening Balance | R$ 1,581,961 | R$ 1,452,435 |
| Increase in Provision for Impairment of Value Added Tax on Sales and Services Credits | (302,420) | (316,741) |
| Decrease In Provision For Impairment Of Value Added Tax On Sales And Services Credits Due To Recovery Of Credits | 150,751 | 186,014 |
| Provision For Impairment Of Value Added Tax On Sales And Services Credits, Write-Off | 1,201 | |
| Closing Balance | R$ 1,733,630 | R$ 1,581,961 |