FINANCIAL ASSETS AND LIABILITIES - Loans, borrowings and debentures - Additional information (Detail) - BRL (R$) R$ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Disclosure of detailed information about borrowings [line items] | ||
| Unused line of credit | R$ 1,510,231 | R$ 2,102,756 |
| MLH [member] | ||
| Disclosure of detailed information about borrowings [line items] | ||
| Balance of bank guarantees contracted | R$ 16,061 | 31,931 |
| Cosan Lubrificantes S.R.L [member] | MLH [member] | ||
| Disclosure of detailed information about borrowings [line items] | ||
| Bank guarantee rate | 0.18% | |
| Firstrate Banks [Member] | MLH [member] | ||
| Disclosure of detailed information about borrowings [line items] | ||
| Bank guarantee rate | 3.90% | |
| Secured | Rumo S.A. [member] | ||
| Disclosure of detailed information about borrowings [line items] | ||
| Balance of bank guarantees contracted | R$ 2,655,231 | R$ 3,120,034 |
| Secured | Rumo S.A. [member] | Weighted average | ||
| Disclosure of detailed information about borrowings [line items] | ||
| Bank guarantee rate | 0.67% | |