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27 Right-of-use asset and lease liability (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Right of Use Asset And Lease Liability [Abstract]    
Initial adoption on beginning R$ 96,604 R$ 118,022
Additions 103,571 9,353
Remeasurement Adjustment 1,406 3,884
Charges 10,528 9,675
Amortization - principal (51,761) (30,946)
Payment - charges (7,577) (9,130)
Baixas   (4,254)
Write-offs (2,670)  
Reclassification (11,740)  
Initial adoption on end 138,361 R$ 96,604
Current 41,193  
Noncurrent R$ 97,168