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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.