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5. Trade Receivables and Reseller Financing (Details 1) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
SummaryOfTradeReceivablesLineItems [Line Items]    
Trade receivables, gross of allowance for doubtful accounts R$ 4,962,689 R$ 3,962,739
Current    
SummaryOfTradeReceivablesLineItems [Line Items]    
Trade receivables, gross of allowance for doubtful accounts 4,102,549 3,326,934
Less than 30 days    
SummaryOfTradeReceivablesLineItems [Line Items]    
Trade receivables, gross of allowance for doubtful accounts 200,939 167,790
31 - 60 days    
SummaryOfTradeReceivablesLineItems [Line Items]    
Trade receivables, gross of allowance for doubtful accounts 46,491 44,152
61 - 90 days    
SummaryOfTradeReceivablesLineItems [Line Items]    
Trade receivables, gross of allowance for doubtful accounts 48,197 23,738
91 - 180 days    
SummaryOfTradeReceivablesLineItems [Line Items]    
Trade receivables, gross of allowance for doubtful accounts 87,812 60,150
More than 180 days    
SummaryOfTradeReceivablesLineItems [Line Items]    
Trade receivables, gross of allowance for doubtful accounts R$ 476,701 R$ 339,975