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Intangible assets (Details 3 - Textuals) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Aug. 10, 2021
Dec. 31, 2017
Dec. 31, 2015
Dec. 31, 2014
Intangible assets              
Impairment of intangible assets R$ 21,895 R$ 0 R$ 0        
Dextra Technologies S.A.              
Intangible assets              
Goodwill arising from acquisition       R$ 595,721      
Comrade Inc.              
Intangible assets              
Goodwill arising from acquisition   10,969     R$ 19,644    
CI&T IN Software Ltda.              
Intangible assets              
Goodwill arising from acquisition             R$ 2,871
CI&T Japan Inc.              
Intangible assets              
Goodwill arising from acquisition   R$ 730       R$ 1,233  
Non-compete agreement | Dextra Technologies S.A.              
Intangible assets              
Residual amount of intangible assets 1,171            
Internally developed | Software | Dextra Technologies S.A.              
Intangible assets              
Write-off R$ 20,723