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Investments in Associates - Summary of Cash Flows (Detail) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of subsidiaries [line items] |  |  |
Net increase in cash and cash equivalents | R$ 2,019,747 | R$ 4,820,036 | R$ 4,607,769
Effect of exchange rate fluctuations on cash held | 511,465 | 350,608 | 242,707
Cash and cash equivalents at beginning of year | 13,642,918 | 8,472,274 | 3,621,798
Cash and cash equivalents at end of year | 16,174,130 | 13,642,918 | 8,472,274
Compass Gás e Energia [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Net cash (used in) from operating activities | (44,974) | (18,046) |
Net cash from (used in) investing activities | (26,764) | 776,872 |
Net cash (used in) from financing activities | 1,265,679 | (525,030) |
Net increase in cash and cash equivalents | 1,193,941 | 233,796 |
Effect of exchange rate fluctuations on cash held | (13,898) | (982) |
Cash and cash equivalents at beginning of year | 232,819 | 5 | 5
Cash and cash equivalents at end of year | 1,412,862 | 232,819 | 5
Comgas [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Net cash (used in) from operating activities | 2,539,222 | 2,111,551 | 2,512,303
Net cash from (used in) investing activities | (1,025,104) | (1,768,298) | 202,037
Net cash (used in) from financing activities | (2,202,275) | 198,890 | (2,233,548)
Net increase in cash and cash equivalents | (688,157) | 542,143 | 480,792
Effect of exchange rate fluctuations on cash held | (30,741) | (15,005) |
Cash and cash equivalents at beginning of year | 1,610,548 | 1,083,410 | 602,618
Cash and cash equivalents at end of year | 891,650 | 1,610,548 | 1,083,410
CLI [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Net cash (used in) from operating activities | 95,461 | 71,654 | 82,946
Net cash from (used in) investing activities | 77,742 | (38,910) | (10,140)
Net cash (used in) from financing activities | (13,766) | 14,874 | 291,898
Net increase in cash and cash equivalents | 159,437 | 47,618 | 364,704
Effect of exchange rate fluctuations on cash held | 109,642 | 125,268 | (44,971)
Cash and cash equivalents at beginning of year | 492,619 | 319,733 |
Cash and cash equivalents at end of year | 761,698 | 492,619 | 319,733
Rumo S.A. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Net cash (used in) from operating activities | (15,679) | 463,170 | 197,313
Net cash from (used in) investing activities | (1,469,750) | (6,632,353) | (929,861)
Net cash (used in) from financing activities | 714,115 | 7,037,144 | 1,432,659
Net increase in cash and cash equivalents | (771,314) | 867,961 | 700,111
Effect of exchange rate fluctuations on cash held | (5,551) |  |
Cash and cash equivalents at beginning of year | 1,568,667 | 700,706 | 595
Cash and cash equivalents at end of year | 791,802 | 1,568,667 | 700,706
Cosan Investimentos [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Net cash (used in) from operating activities | 21,690 |  |
Net cash from (used in) investing activities | 49,227 |  |
Net cash (used in) from financing activities | (15,650) |  |
Net increase in cash and cash equivalents | 55,267 |  |
Effect of exchange rate fluctuations on cash held |  |  |
Cash and cash equivalents at beginning of year |  |  |
Cash and cash equivalents at end of year | R$ 55,267 |  |

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- Definition The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2021-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_45&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2021-01-01 -Paragraph B13 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2021-en-r&anchor=para_B13_a&doctype=Appendix&subtype=B -URIDate 2021-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 54 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_54_i&doctype=Standard -URIDate 2021-03-24 + Details
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