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Marketable securities (Details) - BRL (R$) R$ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Disclosure of financial assets [line items] |  |
Marketable Securities | R$ 8,051,784 | R$ 13,363,511
Current | 7,734,686 | 12,971,547
Non-Current | 317,098 | 391,964
Country of domicile |  |
Disclosure of financial assets [line items] |  |
Marketable Securities | 7,244,521 | 13,293,256
Foreign countries |  |
Disclosure of financial assets [line items] |  |
Marketable Securities | R$ 807,263 | 70,255
Private Funds | CDI |  |
Disclosure of financial assets [line items] |  |
Percentage of basis used to calculate interest rate | 99.50% |
Private Funds | Country of domicile |  |
Disclosure of financial assets [line items] |  |
Marketable Securities | R$ 430,023 | 552,635
Private Securities | CDI/IPCA |  |
Disclosure of financial assets [line items] |  |
Percentage of basis used to calculate interest rate | 6.10% |
Private Securities | Country of domicile |  |
Disclosure of financial assets [line items] |  |
Marketable Securities | R$ 1,255,594 | 1,203,776
Private Securities (CDBs) | CDI |  |
Disclosure of financial assets [line items] |  |
Percentage of basis used to calculate interest rate | 101.80% |
Private Securities (CDBs) | Country of domicile |  |
Disclosure of financial assets [line items] |  |
Marketable Securities | R$ 4,603,030 | 11,144,881
CDBs - Escrow Account | CDI |  |
Disclosure of financial assets [line items] |  |
Percentage of basis used to calculate interest rate | 102.30% |
CDBs - Escrow Account | Country of domicile |  |
Disclosure of financial assets [line items] |  |
Marketable Securities | R$ 317,098 | 391,964
Time Deposits | Foreign countries |  |
Disclosure of financial assets [line items] |  |
Marketable Securities | R$ 802,906 |
Time Deposits | Foreign countries | Fixed |  |
Disclosure of financial assets [line items] |  |
Average yield p.a. % | 4.97% |
Other | Foreign countries |  |
Disclosure of financial assets [line items] |  |
Marketable Securities | R$ 4,357 | R$ 70,255
Other (Restricted financial investment) | CDI |  |
Disclosure of financial assets [line items] |  |
Percentage of basis used to calculate interest rate | 99.94% |
Other (Restricted financial investment) | Country of domicile |  |
Disclosure of financial assets [line items] |  |
Marketable Securities | R$ 24,729 |
Public Securities - Instituto de Crédito Oficial (ICO) | Fixed |  |
Disclosure of financial assets [line items] |  |
Percentage of basis used to calculate interest rate | 12.64% |
Public Securities - Instituto de Crédito Oficial (ICO) | Country of domicile |  |
Disclosure of financial assets [line items] |  |
Marketable Securities | R$ 614,047 |

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