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7. Recoverable Taxes (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
SummaryOfRecoverableTaxesLineItems [Line Items]    
Recoverable taxes R$ 1,194,826 R$ 724,389
Current 881,584 541,772
Non-current 313,242 182,617
ICMS    
SummaryOfRecoverableTaxesLineItems [Line Items]    
Recoverable taxes 580,630 459,255
Provision for ICMS losses(1)    
SummaryOfRecoverableTaxesLineItems [Line Items]    
Recoverable taxes (72,076) (68,683)
PIS and COFINS    
SummaryOfRecoverableTaxesLineItems [Line Items]    
Recoverable taxes 348,333 109,552
IRPJ and CSLL    
SummaryOfRecoverableTaxesLineItems [Line Items]    
Recoverable taxes 295,172 195,276
Value-Added Tax    
SummaryOfRecoverableTaxesLineItems [Line Items]    
Recoverable taxes 27,180 22,121
Others    
SummaryOfRecoverableTaxesLineItems [Line Items]    
Recoverable taxes R$ 15,587 R$ 6,868