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21. Deferred Revenue (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
SummaryOfDeferredRevenueLineItems [Line Items]    
Deferred revenue R$ 31,309 R$ 34,810
Current 18,413 22,300
Non-current 12,896 12,510
Franchising upfront fee    
SummaryOfDeferredRevenueLineItems [Line Items]    
Deferred revenue 19,537 18,620
Loyalty program Km de Vantagens    
SummaryOfDeferredRevenueLineItems [Line Items]    
Deferred revenue 9,134 13,062
Loyalty program Clube Extrafarma    
SummaryOfDeferredRevenueLineItems [Line Items]    
Deferred revenue R$ 2,638 R$ 3,128