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31 Other operating income (expenses), net (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other Operating Income Expenses Net      
Other operating income, net R$ 70,288 R$ 75,667 R$ 93,089
Other operating expenses 37,368 (94,415) (64,498)
Other operating income (expenses), net R$ 107,656 R$ (18,748) R$ 28,591