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Share-based Payment - Summary of Share-based Payment Arrangements (Detail) - shares
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
 [1]
Dec. 31, 2019
 [1]
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Number of share options granted 11,531,359 3,131,000  
Number of share options granted 28,984,479    
Exercised /canceled /transferred (13,391,968)    
Number Of Outstanding Share options 15,592,511 10,536,790 11,478,287
Cosan S.A. [member] | Stock grant programs [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Number of share options granted 9,946,886    
Exercised /canceled /transferred (2,145,646)    
Number Of Outstanding Share options 7,801,240    
Cosan S.A. [member] | Stock grant programs [member] | April 27, 2017 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Type of award / Grant date April 27, 2017    
Company Cosan S.A.    
Expected life (years) 5 years    
Number of share options granted 1,096,000    
Exercised /canceled /transferred (954,028)    
Number Of Outstanding Share options 141,972    
Cosan S.A. [member] | Stock grant programs [member] | July 31, 2017 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Type of award / Grant date July 31, 2017    
Company Cosan S.A.    
Expected life (years) 5 years    
Number of share options granted 1,192,428    
Exercised /canceled /transferred (396,848)    
Number Of Outstanding Share options 795,580    
Cosan S.A. [member] | Stock grant programs [member] | July 31, 2018 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Type of award / Grant date July 31, 2018    
Company Cosan S.A.    
Expected life (years) 5 years    
Number of share options granted 842,408    
Exercised /canceled /transferred (107,576)    
Number Of Outstanding Share options 734,832    
Cosan S.A. [member] | Stock grant programs [member] | July 31, 2019 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Type of award / Grant date July 31, 2019    
Company Cosan S.A.    
Expected life (years) 5 years    
Number of share options granted 229,020    
Exercised /canceled /transferred (20,080)    
Number Of Outstanding Share options 208,940    
Cosan S.A. [member] | Stock grant programs [member] | July 31, 2020 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Type of award / Grant date July 31, 2020    
Company Cosan S.A.    
Expected life (years) 5 years    
Number of share options granted 68,972    
Exercised /canceled /transferred (6,704)    
Number Of Outstanding Share options 62,268    
Cosan S.A. [member] | Stock grant programs [member] | July 31, 2021      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Type of award / Grant date July 31, 2021    
Company Cosan S.A.    
Expected life (years) 3 years    
Number of share options granted 424,839    
Exercised /canceled /transferred    
Number Of Outstanding Share options 424,839    
Cosan S.A. [member] | Stock grant programs [member] | September 10, 2021 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Type of award / Grant date September 10, 2021    
Company Cosan S.A.    
Expected life (years) 4 years    
Number of share options granted 5,283,275    
Exercised /canceled /transferred (660,410)    
Number Of Outstanding Share options 4,622,865    
Cosan S.A. [member] | Stock grant programs [member] | October 11, 2021 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Type of award / Grant date October 11, 2021    
Company Cosan S.A.    
Expected life (years) 5 years    
Number of share options granted 809,944    
Exercised /canceled /transferred    
Number Of Outstanding Share options 809,944    
Cosan S.A. [member] | Stock Grant Modification [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Number of share options granted 6,470,410    
Exercised /canceled /transferred (6,470,410)    
Number Of Outstanding Share options    
Cosan S.A. [member] | Stock Grant Modification [member] | August 18, 2011 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Type of award / Grant date August 18, 2011    
Company Cosan S.A.    
Number of share options granted 6,006,504    
Exercised /canceled /transferred (6,006,504)    
Number Of Outstanding Share options    
Cosan S.A. [member] | Stock Grant Modification [member] | August 31, 2015 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Type of award / Grant date August 31, 2015    
Company Cosan S.A.    
Number of share options granted 463,906    
Exercised /canceled /transferred (463,906)    
Number Of Outstanding Share options    
Comgas [member] | Stock grant programs [member] | July 31, 2019 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Type of award / Grant date July 31, 2019    
Company Comgás    
Expected life (years) 5 years    
Number of share options granted 83,683    
Exercised /canceled /transferred (14,794)    
Number Of Outstanding Share options 68,889    
Comgas [member] | Stock grant programs [member] | April 20, 2017 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Type of award / Grant date April 20, 2017    
Company Comgás    
Expected life (years) 5 years    
Number of share options granted 61,300    
Exercised /canceled /transferred (61,300)    
Number Of Outstanding Share options    
Comgas [member] | Stock grant programs [member] | August 12, 2017 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Type of award / Grant date August 12, 2017    
Company Comgás    
Expected life (years) 5 years    
Number of share options granted 97,780    
Exercised /canceled /transferred (97,780)    
Number Of Outstanding Share options    
Comgas [member] | Stock grant programs [member] | August 1, 2018 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Type of award / Grant date August 1, 2018    
Company Comgás    
Expected life (years) 5 years    
Number of share options granted 96,787    
Exercised /canceled /transferred (17,761)    
Number Of Outstanding Share options 79,026    
Comgas [member] | Cash Settled Transactions [Member] | November 1st, 2021 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Type of award / Grant date November 1<sup><span style="vertical-align: super; font-size: 8pt;">st</span></sup>, <span>2021</span>    
Company Comgás    
Expected life (years) 3 years    
Number of share options granted 172,251    
Exercised /canceled /transferred    
Number Of Outstanding Share options 172,251    
Compass Gas E Energia S A [Member] | Stock grant programs [member] | February 01, 2020 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Type of award / Grant date February 1, 2020    
Company Compass Gás e Energia    
Expected life (years) 5 years    
Number of share options granted 1,858,969    
Exercised /canceled /transferred (1,858,969)    
Number Of Outstanding Share options    
Compass Gas E Energia S A [Member] | Cash Settled Transactions [Member] | August 1st, 2021 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Type of award / Grant date August 1<sup><span style="vertical-align: super; font-size: 8pt;">st</span></sup>, <span>2021</span>    
Company Compass Gás e Energia    
Expected life (years) 2 years    
Number of share options granted 26,625    
Exercised /canceled /transferred    
Number Of Outstanding Share options 26,625    
Compass Gas E Energia S A [Member] | Cash Settled Transactions [Member] | August 1st, 2021, Two [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Type of award / Grant date August 1<sup><span style="vertical-align: super; font-size: 8pt;">st</span></sup>, <span>2021</span>    
Company Compass Gás e Energia    
Expected life (years) 3 years    
Number of share options granted 152,770    
Exercised /canceled /transferred    
Number Of Outstanding Share options 152,770    
Compass Gas E Energia S A [Member] | Cash Settled Transactions [Member] | November 1st, 2021 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Type of award / Grant date November 1<sup><sup><span style="vertical-align: super;">st</span></sup></sup>, <span>2021</span>    
Company Compass Gás e Energia    
Expected life (years) 3 years    
Number of share options granted 1,474,367    
Exercised /canceled /transferred    
Number Of Outstanding Share options 1,474,367    
Comgas and Compass Gas e Energia [member] | Stock grant programs [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Number of share options granted 2,198,519    
Exercised /canceled /transferred (2,050,604)    
Number Of Outstanding Share options 147,915    
Rumo S.A. [member] | Stock grant programs [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Number of share options granted 8,157,131    
Exercised /canceled /transferred (2,725,308)    
Number Of Outstanding Share options 5,431,823    
Rumo S.A. [member] | Stock grant programs [member] | August 1, 2018 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Type of award / Grant date August 1, 2018    
Company Rumo    
Expected life (years) 5 years    
Number of share options granted 1,149,544    
Exercised /canceled /transferred (308,417)    
Number Of Outstanding Share options 841,127    
Rumo S.A. [member] | Stock grant programs [member] | January 2, 2017 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Type of award / Grant date January 2, 2017    
Company Rumo    
Expected life (years) 5 years    
Number of share options granted 1,476,000    
Exercised /canceled /transferred (1,476,000)    
Number Of Outstanding Share options    
Rumo S.A. [member] | Stock grant programs [member] | September 1, 2017 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Type of award / Grant date September 1, 2017    
Company Rumo    
Expected life (years) 5 years    
Number of share options granted 870,900    
Exercised /canceled /transferred (255,250)    
Number Of Outstanding Share options 615,650    
Rumo S.A. [member] | Stock grant programs [member] | August 15, 2019 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Type of award / Grant date August 15, 2019    
Company Rumo    
Expected life (years) 5 years    
Number of share options granted 843,152    
Exercised /canceled /transferred (147,214)    
Number Of Outstanding Share options 695,938    
Rumo S.A. [member] | Stock grant programs [member] | November 11, 2020 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Type of award / Grant date November 11, 2020    
Company Rumo    
Expected life (years) 5 years    
Number of share options granted 776,142    
Exercised /canceled /transferred (115,303)    
Number Of Outstanding Share options 660,839    
Rumo S.A. [member] | Stock grant programs [member] | May 05, 2021 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Type of award / Grant date May 05, 2021    
Company Rumo    
Expected life (years) 5 years    
Number of share options granted 1,481,000    
Exercised /canceled /transferred (414,702)    
Number Of Outstanding Share options 1,066,298    
Rumo S.A. [member] | Stock grant programs [member] | September 15, 2021 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Type of award / Grant date September 15, 2021    
Company Rumo    
Expected life (years) 3 years    
Number of share options granted 1,560,393    
Exercised /canceled /transferred (8,422)    
Number Of Outstanding Share options 1,551,971    
Moove [member] | Cash Settled Transactions [Member] | July 31, 2019 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Type of award / Grant date July 31, 2019    
Company Moove    
Expected life (years) 5 years    
Number of share options granted 132,670    
Exercised /canceled /transferred    
Number Of Outstanding Share options 132,670    
Moove [member] | Cash Settled Transactions [Member] | July 31, 2020 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Type of award / Grant date July 31, 2020    
Company Moove    
Expected life (years) 5 years    
Number of share options granted 106,952    
Exercised /canceled /transferred    
Number Of Outstanding Share options 106,952    
Moove [member] | Cash Settled Transactions [Member] | July 31, 2021      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Type of award / Grant date July 31, 2021    
Company Moove    
Expected life (years) 3 years    
Number of share options granted 80,729    
Exercised /canceled /transferred    
Number Of Outstanding Share options 80,729    
Compas Comercializacao [Member] | Cash Settled Transactions [Member] | August 1st, 2021 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Type of award / Grant date August 1<sup><span style="vertical-align: super; font-size: 8pt;">st</span></sup>, <span>2021</span>    
Company Compass Comercialização    
Expected life (years) 2 years    
Number of share options granted 31,535    
Exercised /canceled /transferred    
Number Of Outstanding Share options 31,535    
TRSP [Member] | Cash Settled Transactions [Member] | August 1st, 2021 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Type of award / Grant date August 1<sup><span style="vertical-align: super; font-size: 8pt;">st</span></sup>, <span>2021</span>    
Company TRSP    
Expected life (years) 3 years    
Number of share options granted 33,634    
Exercised /canceled /transferred    
Number Of Outstanding Share options 33,634    
Moove Compass Gas E Energia Compass Comercializacao TRSP and Comgas [Member] | Cash Settled Transactions [Member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Number of share options granted 2,211,533    
Exercised /canceled /transferred    
Number Of Outstanding Share options 2,211,533    
Bottom of range [member] | Cosan S.A. [member] | Stock Grant Modification [member] | August 18, 2011 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Expected life (years) 1 year    
Bottom of range [member] | Cosan S.A. [member] | Stock Grant Modification [member] | August 31, 2015 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Expected life (years) 5 years    
Top of range [member] | Cosan S.A. [member] | Stock Grant Modification [member] | August 18, 2011 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Expected life (years) 12 years    
Top of range [member] | Cosan S.A. [member] | Stock Grant Modification [member] | August 31, 2015 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Expected life (years) 7 years    
[1] On May 6, 2021, the Company split the issued shares, in the proportion of 1:4, without changing the share capital. The split of shares was approved at the Annual and Extraordinary General Meeting on April 30, 2021.