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21 Loans and Financing (Details 1) - BRL (R$)
R$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about borrowings [line items]      
Loans and financing R$ 3,142,383 R$ 4,047,307 R$ 3,759,505
Loans and financing, percent 100.00% 100.00%  
Foreign Currency [Member]      
Disclosure of detailed information about borrowings [line items]      
Loans and financing R$ 108,983 R$ 104,751  
Loans and financing, percent 3.47% 2.59%  
Foreign Currency [Member] | United States of America, Dollars      
Disclosure of detailed information about borrowings [line items]      
Loans and financing R$ 108,983 R$ 104,751  
Loans and financing, percent 3.47% 2.59%  
Local Currency [Member]      
Disclosure of detailed information about borrowings [line items]      
Loans and financing R$ 3,033,400 R$ 3,942,556  
Loans and financing, percent 96.53% 97.41%  
Local Currency [Member] | CDI      
Disclosure of detailed information about borrowings [line items]      
Loans and financing R$ 676,720 R$ 1,410,479  
Loans and financing, percent 21.54% 34.85%  
Local Currency [Member] | TJLP      
Disclosure of detailed information about borrowings [line items]      
Loans and financing R$ 2,271,187 R$ 2,245,786  
Loans and financing, percent 72.30% 55.49%  
Local Currency [Member] | TR      
Disclosure of detailed information about borrowings [line items]      
Loans and financing R$ 2,202 R$ 4,842  
Loans and financing, percent 0.07% 0.12%  
Local Currency [Member] | IPCA      
Disclosure of detailed information about borrowings [line items]      
Loans and financing R$ 8,288 R$ 11,992  
Loans and financing, percent 0.26% 0.30%  
Local Currency [Member] | Without indexer (annual fixed rate)      
Disclosure of detailed information about borrowings [line items]      
Loans and financing R$ 75,003 R$ 269,457  
Loans and financing, percent 2.36% 6.65%