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27 Right-of-use asset and lease liability (Details 4) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of quantitative information about right-of-use assets [line items]      
Lease liabilities R$ 138,361 R$ 96,604 R$ 118,022
Right to use assets 132,521    
Depreciation expense R$ 51,489 R$ 34,205  
Lease liabilities, percent 12.04%    
Right to use assets, percent 9.30%    
Financial expense, percent 12.68%    
Depreciation expense, percent 8.41%    
Balance in Accordance with IFRS 16 [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Lease liabilities R$ 138,361    
Right to use assets 132,521    
Financial expense 9,510    
Depreciation expense 45,090    
Inflation projected balance [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Lease liabilities 155,015    
Right to use assets 144,842    
Financial expense 10,716    
Depreciation expense R$ 48,883