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9. Trade receivables (Details 2) - BRL (R$)
R$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
SummaryOfTradeReceivablesLineItems [Line Items]    
Current R$ 1,449,927 R$ 1,434,097
Past-due 1,701,931 1,522,381
Total 3,151,858 2,956,478
Up to 30 days    
SummaryOfTradeReceivablesLineItems [Line Items]    
Past-due 330,310 287,173
From 31 to 60 days    
SummaryOfTradeReceivablesLineItems [Line Items]    
Past-due 145,153 100,383
From 61 to 90 days    
SummaryOfTradeReceivablesLineItems [Line Items]    
Past-due 83,679 56,386
From 91 to 120 days    
SummaryOfTradeReceivablesLineItems [Line Items]    
Past-due 54,486 34,685
From 121 to 180 days    
SummaryOfTradeReceivablesLineItems [Line Items]    
Past-due 89,740 70,609
From 181 to 360 days    
SummaryOfTradeReceivablesLineItems [Line Items]    
Past-due 44,856 47,241
Over 360 days    
SummaryOfTradeReceivablesLineItems [Line Items]    
Past-due R$ 953,707 R$ 925,904