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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

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