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21 Loans and Financing (Details 2) - BRL (R$)
R$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about borrowings [line items]    
Gross debt R$ 3,168,710 R$ 4,079,383
Transaction cost (26,327) (32,076)
Net debt 3,142,383 R$ 4,047,307
Noncurrent Installments [Member]    
Disclosure of detailed information about borrowings [line items]    
Gross debt 2,909,950  
Transaction cost (23,088)  
Net debt 2,886,862  
Noncurrent Installments [Member] | 2021 [Member]    
Disclosure of detailed information about borrowings [line items]    
Gross debt 706,500  
Transaction cost (2,781)  
Net debt 703,719  
Noncurrent Installments [Member] | 2022 [Member]    
Disclosure of detailed information about borrowings [line items]    
Gross debt 319,580  
Transaction cost (2,061)  
Net debt 317,519  
Noncurrent Installments [Member] | 2023 [Member]    
Disclosure of detailed information about borrowings [line items]    
Gross debt 191,584  
Transaction cost (1,618)  
Net debt 189,966  
Noncurrent Installments [Member] | 2024 [Member]    
Disclosure of detailed information about borrowings [line items]    
Gross debt 295,366  
Transaction cost (1,625)  
Net debt 293,741  
Noncurrent Installments [Member] | 2025 [Member]    
Disclosure of detailed information about borrowings [line items]    
Gross debt 185,009  
Transaction cost (1,622)  
Net debt 183,387  
Noncurrent Installments [Member] | After 2025 [Member]    
Disclosure of detailed information about borrowings [line items]    
Gross debt 1,211,911  
Transaction cost (13,381)  
Net debt R$ 1,198,530