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21 Loans and Financing (Details 1) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about borrowings [line items]      
Loans and financing R$ 3,188,531 R$ 3,142,383 R$ 4,047,307
Loans and financing, percent 100.00% 100.00%  
Foreign Currency [member]      
Disclosure of detailed information about borrowings [line items]      
Loans and financing R$ 140,337 R$ 108,983  
Loans and financing, percent 4.40% 3.47%  
Foreign Currency [member] | United States of America, Dollars      
Disclosure of detailed information about borrowings [line items]      
Loans and financing R$ 140,337 R$ 108,983  
Loans and financing, percent 4.40% 3.47%  
Local Currency [member]      
Disclosure of detailed information about borrowings [line items]      
Loans and financing R$ 3,048,194 R$ 3,033,400  
Loans and financing, percent 95.60% 96.53%  
Local Currency [member] | TJLP      
Disclosure of detailed information about borrowings [line items]      
Loans and financing R$ 2,090,340 R$ 2,271,187  
Loans and financing, percent 65.58% 72.30%  
Local Currency [member] | CDI      
Disclosure of detailed information about borrowings [line items]      
Loans and financing R$ 638,431 R$ 676,720  
Loans and financing, percent 20.02% 21.54%  
Local Currency [member] | TR      
Disclosure of detailed information about borrowings [line items]      
Loans and financing R$ 2,202  
Loans and financing, percent 0.07%  
Local Currency [member] | IPCA      
Disclosure of detailed information about borrowings [line items]      
Loans and financing R$ 270,749 R$ 8,288  
Loans and financing, percent 8.49% 0.26%  
Local Currency [member] | Without indexer (annual fixed rate)      
Disclosure of detailed information about borrowings [line items]      
Loans and financing R$ 48,674 R$ 75,003  
Loans and financing, percent 1.51% 2.36%