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10 Trade receivables (Details 1) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Summary of trade receivables [Line Items]    
Current R$ 1,793,104 R$ 1,762,606
Past-due 1,815,501 1,632,436
Total 3,608,605 3,395,042
Up to 30 days [member]    
Summary of trade receivables [Line Items]    
Past-due 340,760 330,488
From 31 to 60 days [member]    
Summary of trade receivables [Line Items]    
Past-due 177,103 164,913
From 61 to 90 days [member]    
Summary of trade receivables [Line Items]    
Past-due 120,488 86,765
From 91 to 120 days [member]    
Summary of trade receivables [Line Items]    
Past-due 88,323 58,971
From 121 to 180 days [member]    
Summary of trade receivables [Line Items]    
Past-due 113,060 81,003
From 181 to 360 days [member]    
Summary of trade receivables [Line Items]    
Past-due 82,365 33,206
Over 360 days [member]    
Summary of trade receivables [Line Items]    
Past-due R$ 893,402 R$ 877,090