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Investments in Associates - Summary of Financial Position (Detail) - BRL (R$) R$ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Current |  |  |  |
Assets | R$ 27,293,183 | R$ 23,434,868 |  |
Liabilities | (12,957,036) | (12,546,994) |  |
Net current assets | (14,336,147) | (10,887,874) |  |
Non-current |  |  |  |
Assets | 70,548,840 | 60,278,697 |  |
Liabilities | (56,014,965) | (50,347,704) |  |
Total shareholders' equity | 28,870,022 | 20,818,867 | R$ 16,240,481 | R$ 17,969,356
Compass Gás e Energia [member] |  |  |  |
Current |  |  |  |
Assets | 1,929,639 | 402,007 |  |
Liabilities | (28,374) | (25,404) |  |
Net current assets | 1,901,265 | 376,603 |  |
Non-current |  |  |  |
Assets | 4,453,679 | 2,944,593 |  |
Liabilities | (10,296) |  |  |
Net non-current assets | 4,443,383 | 2,944,593 |  |
Total shareholders' equity | 6,344,648 | 3,321,196 |  |
Comgas [member] |  |  |  |
Current |  |  |  |
Assets | 4,148,735 | 4,225,788 |  |
Liabilities | (4,538,385) | (3,610,144) |  |
Net current assets | (389,650) | 615,644 |  |
Non-current |  |  |  |
Assets | 8,122,763 | 6,391,096 |  |
Liabilities | (6,627,895) | (6,416,687) |  |
Net non-current assets | 1,494,868 | (25,591) |  |
Total shareholders' equity | 1,105,218 | 590,035 |  |
CLI [Member] |  |  |  |
Current |  |  |  |
Assets | 1,327,472 | 1,047,938 |  |
Liabilities | (755,995) | (616,427) |  |
Net current assets | 571,477 | 431,511 |  |
Non-current |  |  |  |
Assets | 1,946,181 | 1,893,901 |  |
Liabilities | (229,802) | (360,077) |  |
Net non-current assets | 1,716,379 | 1,533,824 |  |
Total shareholders' equity | 2,287,856 | 1,965,335 |  |
Rumo S.A. [member] |  |  |  |
Current |  |  |  |
Assets | 1,161,027 | 1,996,914 |  |
Liabilities | (760,522) | (841,519) |  |
Net current assets | 400,505 | 1,155,395 |  |
Non-current |  |  |  |
Assets | 21,568,088 | 19,624,672 |  |
Liabilities | (7,173,172) | (5,796,462) |  |
Net non-current assets | 14,394,916 | 13,828,210 |  |
Total shareholders' equity | 14,795,421 | 14,983,605 |  |
Cosan Investimentos [member] |  |  |  |
Current |  |  |  |
Assets | 147,662 |  |  |
Liabilities | (50,038) |  |  |
Net current assets | 97,624 |  |  |
Non-current |  |  |  |
Assets | 4,337,142 |  |  |
Liabilities | (196,562) |  |  |
Net non-current assets | 4,140,580 |  |  |
Total shareholders' equity | R$ 4,238,204 |  |  |

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