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Investments in Joint Ventures - Summary of Changes to Investments in Joint Ventures (Detail) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of joint ventures [line items] |  |  |  |
Beginning balance | R$ 7,988,208 |  |  |
Interest in earnings of joint ventures | 4,590,631 |  | R$ 583,001 | R$ 1,131,406
Ending balance | R$ 10,936,663 |  | 7,988,208 |
Reorganization [Member] |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Shares issued by the joint venture | 1,447,807,814 |  |  |
Shares held by Cosan | 105,246,282 |  |  |
Proportion of ownership interest in joint venture | 6.00% |  |  |
Beginning balance |  |  |  |
Interest in earnings of joint ventures | 4,215,116 | [1] |  |
Other comprehensive (losses) income | (73,416) |  |  |
Interest on capital | (122,480) | [2] |  |
Corporate reorganization | 3,204,832 |  |  |
Dividends | 17,742 | [2] |  |
Ending balance | R$ 7,241,794 |  |  |
Raizen Combustiveis S A [member] |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Proportion of ownership interest in joint venture | 50.00% |  |  |
Raizen Combustiveis S A [member] | Before Reorganization [Member] |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Shares issued by the joint venture | 1,661,418,472 |  |  |
Shares held by Cosan | 830,709,236 |  |  |
Proportion of ownership interest in joint venture | 50.00% |  |  |
Beginning balance | R$ 3,847,506 |  | 3,212,601 |
Interest in earnings of joint ventures | 448,124 | [1] | 332,240 |
Other comprehensive (losses) income | 215,787 |  | 376,053 |
Interest on capital | (100,318) | [2] | (73,388) |
Corporate reorganization |  |  |  |
Dividends | (716,230) | [2] |  |
Ending balance | R$ 3,694,869 |  | 3,847,506 | 3,212,601
Raizen Energia S A [member] | Before Reorganization [Member] |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Shares issued by the joint venture | 7,243,283,198 |  |  |
Shares held by Cosan | 3,621,641,599 |  |  |
Proportion of ownership interest in joint venture | 50.00% |  |  |
Beginning balance | R$ 4,140,702 |  | 4,336,359 |
Interest in earnings of joint ventures | (72,609) | [1] | 250,761 |
Other comprehensive (losses) income | (491,548) |  | (446,001) |
Interest on capital |  | [2] |  |
Corporate reorganization | (3,204,832) |  |  |
Dividends | (371,713) | [2] | (417) |
Ending balance |  |  | 4,140,702 | 4,336,359
Raizen S A [Member] |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Shares issued by the joint venture | 10,352,509,484 |  |  |
Shares held by Cosan | 4,557,597,117 |  |  |
Proportion of ownership interest in joint venture | 44.02% |  |  |
Beginning balance | R$ 7,988,208 |  | 7,548,960 |
Interest in earnings of joint ventures | 4,590,631 | [1] | 583,001 |
Other comprehensive (losses) income | (349,177) |  | (69,948) |
Interest on capital | (222,798) | [2] | (73,388) |
Corporate reorganization |  |  |  |
Dividends | (1,070,201) | [2] | (417) |
Ending balance | R$ 10,936,663 |  | R$ 7,988,208 | R$ 7,548,960
[1] | As disclosed in Note 2, the conclusion of Raízen's IPO and the acquisition of Biosev resulted in two capitalizations in Raízen's equity of R$6,599,987 and R$2,347,281, respectively. Such capitalizations resulted in a dilution of Cosan S.A.'s interest in Raízen without the loss of shared control, keeping the investment classified as a joint venture. The following are the gains and losses recognized for the period:
[2] | Proposed amount in the period, of which R$819,729 were paid.

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