INVESTMENTS IN SUBSIDIARIES AND ASSOCIATES - Schedule of impairment loss and recoverability test of investments in affiliates with significant influence (Details) - BRL (R$) R$ in Thousands |
12 Months Ended | ||||
|---|---|---|---|---|---|
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
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| Disclosure of assets and liabilities held for sale and discontinued operation [line items] | |||||
| Recoverable value | R$ 10,678,566 | R$ 17,611,369 | |||
| Impairment in associate | R$ (4,672,396) | ||||
| Vale SA [Member] | |||||
| Disclosure of assets and liabilities held for sale and discontinued operation [line items] | |||||
| Quantity held by Cosan on December 31, 2024 | [1] | 177,342,515 | |||
| Affiliates with significant influence [member] | Vale SA [Member] | |||||
| Disclosure of assets and liabilities held for sale and discontinued operation [line items] | |||||
| Quantity held by Cosan on December 31, 2024 | 177,342,515 | ||||
| Recoverable value | R$ 9,112,136 | ||||
| Book value | 13,784,532 | ||||
| Impairment in associate | R$ (4,672,396) | ||||
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