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6 Cash and cash equivalents (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash and cash equivalents [abstract]        
Cash and bank deposits R$ 57,729 R$ 13,092    
Cash equivalents (a) 987,313 930,117    
Cash and cash equivalents R$ 1,045,042 R$ 943,209 R$ 62,260 R$ 25,490