v3.25.1
INVESTMENT IN JOINT VENTURES - Additional Information (Detail) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of joint ventures [line items]    
Capital increase R$ 12,337 R$ 47,300
Cosan Nove Participações S.A. [member]    
Disclosure of joint ventures [line items]    
Percentage of ownership interest 66.16%  
Cosan Nove Participações S.A. [member] | Direct    
Disclosure of joint ventures [line items]    
Percentage of ownership interest 73.09% 73.09%
Rumo S.A. [member] | Direct    
Disclosure of joint ventures [line items]    
Percentage of ownership interest [1] 30.40% 30.42%
Raizen S A [Member]    
Disclosure of joint ventures [line items]    
Ownership interest percentage in joint venture 30.87%  
Capital increase
Raizen S A [Member] | Direct    
Disclosure of joint ventures [line items]    
Ownership interest percentage in joint venture 5.01%  
Raizen S A [Member] | Indirect    
Disclosure of joint ventures [line items]    
Ownership interest percentage in joint venture 25.86%  
Raizen S A [Member] | Cosan Nove Participações S.A. [member] | Indirect    
Disclosure of joint ventures [line items]    
Ownership interest percentage in joint venture 39.09%  
Radar Gestão de Investimentos S.A. [Member]    
Disclosure of joint ventures [line items]    
Ownership interest percentage in joint venture 50.00%  
Capital increase R$ 12,337
Radar Gestão de Investimentos S.A. [Member] | Direct    
Disclosure of joint ventures [line items]    
Ownership interest percentage in joint venture 50.00%  
Capital increase R$ 12,337  
Radar Gestão de Investimentos S.A. [Member] | Indirect    
Disclosure of joint ventures [line items]    
Ownership interest percentage in joint venture  
[1] The Company is the largest shareholder. In addition, the Company has decision-making power over the relevant activities of this entity and has the right to appoint a majority of the members of the board of directors in accordance with the shareholders' agreement entered with certain other shareholders of the entity.