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Investments in Associates - Summary of Non-controlling Interests in Subsidiaries (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Statement of financial statements [line items]      
Beginning balance R$ 15,558,784    
Interest in earnings of subsidiaries 1,822,161 R$ 3,695,493 R$ (3,836,639)
Ending balance 14,129,085 15,558,784  
Subsidiaries [member]      
Statement of financial statements [line items]      
Beginning balance 15,558,784 10,838,616  
Interest in earnings of subsidiaries 384,320 628,812  
Sales or purchase of interests 1,835,552 4,061,797  
Other comprehensive income 88,086 119,531  
Dividends (164,908) (96,538)  
Capital increase (decrease) 2,252,306 6,666  
Other 2,131,407 (100)  
Predecessor adjustments (4,109,186)    
Ending balance R$ 14,129,085 15,558,784 10,838,616
Compass Gás e Energia [member]      
Statement of financial statements [line items]      
Shares issued by the subsidiary 714,190,095    
Shares held by non-controlling shareholders 85,702,404    
Non-controlling interest 12.00%    
Compass Gás e Energia [member] | Subsidiaries [member]      
Statement of financial statements [line items]      
Beginning balance R$ 32,880  
Interest in earnings of subsidiaries 74,390 7,848  
Sales or purchase of interests 1,505,311 30,431  
Other comprehensive income 7,698 552  
Dividends (97,187) (5,986)  
Capital increase (decrease) 2,250,015  
Other 1,053 35  
Predecessor adjustments    
Ending balance R$ 761,432 32,880
Comgas [member]      
Statement of financial statements [line items]      
Shares issued by the subsidiary 132,520,587    
Shares held by non-controlling shareholders 1,139,210    
Non-controlling interest 0.86%    
Comgas [member] | Subsidiaries [member]      
Statement of financial statements [line items]      
Beginning balance R$ 24,729 24,569  
Interest in earnings of subsidiaries 17,524 9,200  
Sales or purchase of interests  
Other comprehensive income 625 484  
Dividends (14,184) (9,535)  
Capital increase (decrease)  
Other 228 11  
Predecessor adjustments    
Ending balance R$ 28,466 24,729 24,569
Cosan Lubes [member]      
Statement of financial statements [line items]      
Shares issued by the subsidiary 34,963,764    
Shares held by non-controlling shareholders 10,489,129    
Non-controlling interest 30.00%    
Payly [Member]      
Statement of financial statements [line items]      
Shares issued by the subsidiary 78,527,201    
Shares held by non-controlling shareholders 19,631,324    
Non-controlling interest 25.00%    
Rumo S.A. [member]      
Statement of financial statements [line items]      
Shares issued by the subsidiary 1,854,158,791    
Shares held by non-controlling shareholders 1,291,629,301    
Non-controlling interest 69.65%    
Cosan Limited Partners Brasil Consultoria Ltda [Member]      
Statement of financial statements [line items]      
Shares issued by the subsidiary 160,000    
Shares held by non-controlling shareholders 4,000    
Non-controlling interest 2.50%    
Sinlog Tecnologia em Logistica SA [Member]      
Statement of financial statements [line items]      
Shares issued by the subsidiary 86,370    
Shares held by non-controlling shareholders 23,967    
Non-controlling interest 27.75%    
TTA [Member]      
Statement of financial statements [line items]      
Shares issued by the subsidiary 10,521    
Shares held by non-controlling shareholders    
Non-controlling interest    
Radar II Propriedades Agricolas S.A. [member]      
Statement of financial statements [line items]      
Shares issued by the subsidiary 81,440,221    
Shares held by non-controlling shareholders 40,720,111    
Non-controlling interest 50.00%    
Radar Propriedades Agricolas S.A. [member]      
Statement of financial statements [line items]      
Shares issued by the subsidiary 1,266,986    
Shares held by non-controlling shareholders 633,493    
Non-controlling interest 50.00%    
Nova Agrícola Ponte Alta S.A. [member]      
Statement of financial statements [line items]      
Shares issued by the subsidiary 160,693,378    
Shares held by non-controlling shareholders 80,346,689    
Non-controlling interest 50.00%    
Terras da Ponta Alta S.A. [member]      
Statement of financial statements [line items]      
Shares issued by the subsidiary 16,066,329    
Shares held by non-controlling shareholders 8,033,165    
Non-controlling interest 50.00%    
Nova Santa Bárbara Agrícola S.A. [member]      
Statement of financial statements [line items]      
Shares issued by the subsidiary 32,336,994    
Shares held by non-controlling shareholders 16,168,497    
Non-controlling interest 50.00%    
Nova Amaralina S.A. [member]      
Statement of financial statements [line items]      
Shares issued by the subsidiary 30,603,159    
Shares held by non-controlling shareholders 15,301,580    
Non-controlling interest 50.00%    
Paineira Propriedades Agrícolas S.A. [member]      
Statement of financial statements [line items]      
Shares issued by the subsidiary 132,667,061    
Shares held by non-controlling shareholders 66,333,531    
Non-controlling interest 50.00%    
Manacá Propriedades Agrícolas S.A. [member]      
Statement of financial statements [line items]      
Shares issued by the subsidiary 128,977,921    
Shares held by non-controlling shareholders 64,488,961    
Non-controlling interest 50.00%    
Castanheira Propriedades Agrícolas S.A. [member]      
Statement of financial statements [line items]      
Shares issued by the subsidiary 83,850,838    
Shares held by non-controlling shareholders 41,925,419    
Non-controlling interest 50.00%    
Cosan S.A. [member] | Subsidiaries [member]      
Statement of financial statements [line items]      
Beginning balance R$ 3,492,829 3,604,875  
Interest in earnings of subsidiaries 69,890 336,885  
Sales or purchase of interests (407,177)  
Other comprehensive income 115,049 28,573  
Dividends (68,120)  
Capital increase (decrease)  
Other 1,023 (2,207)  
Predecessor adjustments (3,448,693)    
Ending balance 3,492,829 3,604,875
Cosan Logistica [member] | Subsidiaries [member]      
Statement of financial statements [line items]      
Beginning balance 658,158 630,185  
Interest in earnings of subsidiaries 4,898 12,966  
Sales or purchase of interests 14,006  
Other comprehensive income 358 1,006  
Dividends (5)  
Capital increase (decrease)  
Other  
Predecessor adjustments (663,414)    
Ending balance 658,158 630,185
CLI [Member] | Subsidiaries [member]      
Statement of financial statements [line items]      
Beginning balance 582,284 470,498  
Interest in earnings of subsidiaries 87,823 44,816  
Sales or purchase of interests  
Other comprehensive income 13,037 66,970  
Dividends  
Capital increase (decrease)  
Other  
Predecessor adjustments    
Ending balance 683,144 582,284 470,498
Rumo [member] | Subsidiaries [member]      
Statement of financial statements [line items]      
Beginning balance 10,709,017 6,058,973  
Interest in earnings of subsidiaries 107,690 212,463  
Sales or purchase of interests 318,323 4,424,537  
Other comprehensive income 5,358 15,786  
Dividends (27,989) (2,742)  
Capital increase (decrease)  
Other (15,748)  
Predecessor adjustments 2,570    
Ending balance 10,494,071 10,709,017 6,058,973
Logispot Armazens Gerais S A [member] | Subsidiaries [member]      
Statement of financial statements [line items]      
Beginning balance 35,513 34,218  
Interest in earnings of subsidiaries 2,225 1,879  
Sales or purchase of interests  
Other comprehensive income  
Dividends (4,032) (584)  
Capital increase (decrease)  
Other  
Predecessor adjustments    
Ending balance 33,706 35,513 34,218
Radar [member] | Subsidiaries [member]      
Statement of financial statements [line items]      
Beginning balance    
Interest in earnings of subsidiaries 22,502    
Sales or purchase of interests    
Other comprehensive income 900    
Dividends (19,854)    
Capital increase (decrease)    
Other 54    
Predecessor adjustments    
Ending balance 2,119,102  
Other investments [member] | Subsidiaries [member]      
Statement of financial statements [line items]      
Beginning balance 23,374 15,298  
Interest in earnings of subsidiaries 2,622 2,755  
Sales or purchase of interests 11,918  
Other comprehensive income 1,013 6,160  
Dividends (1,662) (9,566)  
Capital increase (decrease) 2,291 6,666  
Other 363 2,061  
Predecessor adjustments 351    
Ending balance R$ 9,164 R$ 23,374 R$ 15,298