v3.25.1
INVESTMENTS IN SUBSIDIARIES AND ASSOCIATES - Summary of Information in Associates of Company and Company's Ownership (Detail) - BRL (R$)
R$ in Thousands
 1 Months Ended 12 Months Ended
Apr. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of investments accounted for using equity method [line items]        
Beginning balance   R$ 17,611,369    
Interest in earnings of associates   (1,719,031) R$ (350,399) R$ (418,897)
Ending balance   R$ 10,678,566 17,611,369  
Rhall Terminais Ltda. [member]        
Disclosure of investments accounted for using equity method [line items]        
Shares issued by the investee   28,580    
Shares held by Cosan   8,574    
Cosan ownership interest   30.00%    
Termag - Terminal Marítimo de Guarujá S.A. [member]        
Disclosure of investments accounted for using equity method [line items]        
Shares issued by the investee   500,000    
Shares held by Cosan   99,250    
Cosan ownership interest   19.85%    
TGG - Terminal de Granéis do Guarujá S.A. [member]        
Disclosure of investments accounted for using equity method [line items]        
Shares issued by the investee   500,000    
Shares held by Cosan   50,000    
Cosan ownership interest   10.00%    
CLI SUL SA [Member]        
Disclosure of investments accounted for using equity method [line items]        
Shares issued by the investee   543,750,625    
Shares held by Cosan   108,750,125    
Cosan ownership interest   20.00%    
Terminal Multimodal de Grãos e Fertilizantes S.A [member]        
Disclosure of investments accounted for using equity method [line items]        
Shares issued by the investee   60,005,000    
Shares held by Cosan   30,002,500    
Cosan ownership interest   50.00%    
Companhia de Gás de Santa Catarina - Scgás [member]        
Disclosure of investments accounted for using equity method [line items]        
Shares issued by the investee   10,749,497    
Shares held by Cosan   4,407,293    
Cosan ownership interest   41.00%    
CEG Rio S.A. [member]        
Disclosure of investments accounted for using equity method [line items]        
Shares issued by the investee   1,995,022,625    
Shares held by Cosan   746,251,086    
Cosan ownership interest   37.41%    
Companhia de Gás de Mato Grosso do Sul - Msgás [member]        
Disclosure of investments accounted for using equity method [line items]        
Shares issued by the investee   61,610,000    
Shares held by Cosan   30,188,900    
Cosan ownership interest   49.00%    
Vale SA [Member]        
Disclosure of investments accounted for using equity method [line items]        
Shares issued by the investee [1]   4,539,007,580    
Shares held by Cosan [1]   177,342,515    
Cosan ownership interest 4.15% 4.15% [1]    
Associates [member]        
Disclosure of investments accounted for using equity method [line items]        
Beginning balance   R$ 17,611,369 2,913,943  
Interest in earnings of associates   1,719,031 350,399  
Discontinued operation     45,419  
Impairment in associate   (4,672,396)    
Dividends   (1,175,775) (273,346)  
Capital reduction     (99,040)  
Reclassification to held for sale   (60,792) (892,854)  
Write-off related to sale of shareholding   (2,462,833)    
Business Combination [2]   (413,271)    
Capital increase   30,000    
Reclassification of financial assets     16,274,081  
Other   103,233 (707,233)  
Ending balance   10,678,566 17,611,369 2,913,943
Dividend receivable   107,872 [3] 35,836 [4]  
Associates [member] | Rhall Terminais Ltda. [member]        
Disclosure of investments accounted for using equity method [line items]        
Beginning balance   6,170 5,654  
Interest in earnings of associates   2,335 1,716  
Discontinued operation      
Impairment in associate      
Dividends   (1,208) (1,200)  
Capital reduction      
Reclassification to held for sale    
Write-off related to sale of shareholding      
Business Combination [2]      
Reclassification of financial assets      
Other    
Ending balance   7,297 6,170 5,654
Dividend receivable   [3] [4]  
Associates [member] | Termag - Terminal Marítimo de Guarujá S.A. [member]        
Disclosure of investments accounted for using equity method [line items]        
Beginning balance   6,018 8,464  
Interest in earnings of associates   (1,721) (2,446)  
Discontinued operation      
Impairment in associate      
Dividends    
Capital reduction      
Reclassification to held for sale    
Write-off related to sale of shareholding      
Business Combination [2]      
Reclassification of financial assets      
Other    
Ending balance   4,297 6,018 8,464
Dividend receivable   [3] [4]  
Associates [member] | TGG - Terminal de Granéis do Guarujá S.A. [member]        
Disclosure of investments accounted for using equity method [line items]        
Beginning balance   15,960 17,468  
Interest in earnings of associates   7,463 8,826  
Discontinued operation      
Impairment in associate      
Dividends   (7,000) (10,334)  
Capital reduction      
Reclassification to held for sale    
Write-off related to sale of shareholding      
Business Combination [2]      
Reclassification of financial assets      
Other    
Ending balance   16,423 15,960 17,468
Dividend receivable   [3] [4]  
Associates [member] | CLI SUL SA [Member]        
Disclosure of investments accounted for using equity method [line items]        
Beginning balance   217,738    
Interest in earnings of associates   17,953    
Dividends   (12,900)    
Business Combination [2]      
Other      
Ending balance   222,791 217,738  
Dividend receivable [3]      
Associates [member] | Elevacoes Portuarias S.A. [member]        
Disclosure of investments accounted for using equity method [line items]        
Beginning balance   217,738 296,746  
Interest in earnings of associates     38,992  
Discontinued operation      
Dividends     (18,960)  
Capital reduction     (99,040)  
Reclassification to held for sale      
Reclassification of financial assets      
Other      
Ending balance     217,738 296,746
Dividend receivable [4]      
Associates [member] | Terminal XXXIX S.A. [member]        
Disclosure of investments accounted for using equity method [line items]        
Beginning balance   66,415 53,136  
Interest in earnings of associates   14,247 28,247  
Discontinued operation      
Impairment in associate      
Dividends   (19,870) (14,968)  
Capital reduction      
Reclassification to held for sale   (60,792)  
Write-off related to sale of shareholding      
Business Combination [2]      
Reclassification of financial assets      
Other    
Ending balance   66,415 53,136
Dividend receivable   [3] [4]  
Associates [member] | Terminal Multimodal de Grãos e Fertilizantes S.A [member]        
Disclosure of investments accounted for using equity method [line items]        
Beginning balance      
Interest in earnings of associates   78    
Dividends   (20)    
Reclassification to held for sale      
Write-off related to sale of shareholding      
Business Combination [2]      
Capital increase   30,000    
Other      
Ending balance   30,058  
Dividend receivable [3]   17    
Associates [member] | Companhia Paranaense de Gás - Compagás [member]        
Disclosure of investments accounted for using equity method [line items]        
Beginning balance   403,532 424,837  
Interest in earnings of associates   27,656 36,300  
Discontinued operation      
Impairment in associate      
Dividends   (18,209) (57,956)  
Capital reduction      
Reclassification to held for sale    
Write-off related to sale of shareholding      
Business Combination [2]   (413,271)    
Reclassification of financial assets      
Other   292 351  
Ending balance   403,532 424,837
Dividend receivable   [3] 5,636 [4]  
Associates [member] | Companhia de Gás de Santa Catarina - Scgás [member]        
Disclosure of investments accounted for using equity method [line items]        
Beginning balance   640,332 627,829  
Interest in earnings of associates   46,179 37,028  
Discontinued operation      
Impairment in associate      
Dividends   (32,824) (24,525)  
Capital reduction      
Reclassification to held for sale    
Write-off related to sale of shareholding      
Business Combination [2]      
Reclassification of financial assets      
Other    
Ending balance   653,687 640,332 627,829
Dividend receivable   5,495 [3] 6,957 [4]  
Associates [member] | CEG Rio S.A. [member]        
Disclosure of investments accounted for using equity method [line items]        
Beginning balance   288,386 274,480  
Interest in earnings of associates   66,796 84,822  
Discontinued operation      
Impairment in associate      
Dividends   (18,390) (70,916)  
Capital reduction      
Reclassification to held for sale    
Write-off related to sale of shareholding      
Business Combination [2]      
Reclassification of financial assets      
Other    
Ending balance   336,792 288,386 274,480
Dividend receivable   16,426 [3] 20,708 [4]  
Associates [member] | Companhia de Gás de Mato Grosso do Sul - Msgás [member]        
Disclosure of investments accounted for using equity method [line items]        
Beginning balance   297,874 291,543  
Interest in earnings of associates   13,856 20,828  
Discontinued operation      
Impairment in associate      
Dividends   (24,254) (14,497)  
Capital reduction      
Reclassification to held for sale    
Write-off related to sale of shareholding      
Business Combination [2]      
Reclassification of financial assets      
Other    
Ending balance   287,476 297,874 291,543
Dividend receivable   [3] 2,496 [4]  
Associates [member] | Companhia Pernambucana de Gás - Copergás [member]        
Disclosure of investments accounted for using equity method [line items]        
Beginning balance   415,301  
Interest in earnings of associates      
Discontinued operation     5,921  
Dividends     (19,238)  
Capital reduction      
Reclassification to held for sale     (401,984)  
Reclassification of financial assets      
Other      
Ending balance     415,301
Dividend receivable [4]      
Associates [member] | Norgás S.A. [member]        
Disclosure of investments accounted for using equity method [line items]        
Beginning balance      
Interest in earnings of associates      
Dividends      
Reclassification to held for sale      
Write-off related to sale of shareholding      
Business Combination [2]      
Other      
Ending balance    
Dividend receivable [3]   7,425    
Associates [member] | Sergipe Gás S.A. - SERGÁS [member]        
Disclosure of investments accounted for using equity method [line items]        
Beginning balance   69,430  
Interest in earnings of associates      
Discontinued operation     3,230  
Dividends     (5,466)  
Capital reduction      
Reclassification to held for sale     (67,194)  
Reclassification of financial assets      
Other      
Ending balance     69,430
Dividend receivable [4]      
Associates [member] | Companhia de Gás do Ceará - Cegás [member]        
Disclosure of investments accounted for using equity method [line items]        
Beginning balance   184,537  
Interest in earnings of associates      
Discontinued operation     11,573  
Dividends     (13,676)  
Capital reduction      
Reclassification to held for sale     (183,880)  
Reclassification of financial assets      
Other     1,446  
Ending balance     184,537
Dividend receivable [4]      
Associates [member] | Companhia Potiguar de Gás - Potigas [member]        
Disclosure of investments accounted for using equity method [line items]        
Beginning balance   168,887  
Interest in earnings of associates      
Discontinued operation     14,371  
Dividends     (13,118)  
Capital reduction      
Reclassification to held for sale     (170,140)  
Reclassification of financial assets      
Other      
Ending balance     168,887
Dividend receivable [4]      
Associates [member] | Gás de Alagoas S.A. - ALGÁS [member]        
Disclosure of investments accounted for using equity method [line items]        
Beginning balance   68,448  
Interest in earnings of associates      
Discontinued operation     10,324  
Dividends     (8,492)  
Capital reduction      
Reclassification to held for sale     (69,656)  
Reclassification of financial assets      
Other     (624)  
Ending balance     68,448
Dividend receivable [4]      
Associates [member] | Vale SA [Member]        
Disclosure of investments accounted for using equity method [line items]        
Beginning balance   15,662,485  
Interest in earnings of associates   1,524,327 96,075  
Discontinued operation      
Impairment in associate   (4,672,396)    
Dividends   (1,041,100)  
Capital reduction      
Reclassification to held for sale    
Write-off related to sale of shareholding   (2,462,833)    
Business Combination [2]      
Reclassification of financial assets     16,274,081  
Other   101,653 (707,671)  
Ending balance   9,112,136 15,662,485
Dividend receivable   78,509 [3] [4]  
Associates [member] | Other investments [member]        
Disclosure of investments accounted for using equity method [line items]        
Beginning balance   6,459 7,183  
Interest in earnings of associates   (138) 11  
Discontinued operation      
Impairment in associate      
Dividends    
Capital reduction      
Reclassification to held for sale    
Write-off related to sale of shareholding      
Business Combination [2]      
Reclassification of financial assets      
Other   1,288 (735)  
Ending balance   7,609 6,459 R$ 7,183
Dividend receivable   [3] R$ 39 [4]  
[1] In April 2024, Cosan sold 33,524,185 Vale shares, reducing its stake by 0.78%. The figure of 4.15% refers to the percentage holding, excluding treasury shares, for calculating equity equivalence and receiving dividends.
[2] As disclosed in note 9.2, the subsidiary Compass acquired a 51% stake and control of Compagas and is no longer considered an associate.
[3] Dividends receivable by the parent companies of the subsidiaries disclosed in the table, which are consolidated in Cosan S.A.
[4] Dividends receivable by the parent companies of the subsidiaries disclosed in the table, which are consolidated in Cosan S.A.