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Property, plant and equipment, intangible assets, goodwill, right-of-use assets and contract assets - Summary of Combined carrying amounts of goodwill allocated to each cash-generating unit (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of information for cash-generating units [line items]    
Growth rates (as a percent) 3.00% 3.30%
Assumptions    
Risk-free fee (T-Note 10y) (as a percent) 1.46%  
Market risk premium (as a percent) 5.63%  
BR    
Assumptions    
Inflation (as a percent) 3.00%  
Country risk premium (as a percent) 3.68%  
Tax rate (as a percent) 34.00%  
US    
Assumptions    
Inflation (as a percent) 2.16%  
UK    
Assumptions    
Inflation (as a percent) 2.04%  
Country risk premium (as a percent) 0.51%  
Tax rate (as a percent) 19.00%  
ARG    
Assumptions    
Country risk premium (as a percent) 10.21%  
Tax rate (as a percent) 30.00%  
Bottom of range [member]    
Disclosure of information for cash-generating units [line items]    
Discount rates (as a percent) 8.30% 8.30%
Top of range [member]    
Disclosure of information for cash-generating units [line items]    
Discount rates (as a percent) 12.20% 9.30%
Cash-generating units [member]    
Disclosure of information for cash-generating units [line items]    
Goodwill R$ 1,132,817 R$ 1,077,758
Cash generating unit – Moove    
Disclosure of information for cash-generating units [line items]    
Goodwill 916,742 882,373
Cash generating unit – Compass    
Disclosure of information for cash-generating units [line items]    
Goodwill 94,891 94,891
Cash generating unit – Logística    
Disclosure of information for cash-generating units [line items]    
Goodwill 100,451 100,451
Cash generating unit – Cosan – Other Business    
Disclosure of information for cash-generating units [line items]    
Goodwill R$ 20,733 R$ 43