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22 Debentures (Details 1)
R$ in Thousands
Dec. 31, 2020
BRL (R$)
Disclosure of detailed information about borrowings [line items]  
Gross debt R$ 4,935,558
Transaction cost (59,488)
Net debt 4,876,070
2021 [member]  
Disclosure of detailed information about borrowings [line items]  
Gross debt 2,035,503
Transaction cost (18,969)
Net debt 2,016,534
2022 [member]  
Disclosure of detailed information about borrowings [line items]  
Gross debt 1,173,340
Transaction cost (12,064)
Net debt 1,161,276
2023 [member]  
Disclosure of detailed information about borrowings [line items]  
Gross debt 504,759
Transaction cost (6,982)
Net debt 497,777
2024 [member]  
Disclosure of detailed information about borrowings [line items]  
Gross debt 499,422
Transaction cost (5,298)
Net debt 494,124
2025 [member]  
Disclosure of detailed information about borrowings [line items]  
Gross debt 234,477
Transaction cost (3,756)
Net debt 230,721
After 2026 [Member]  
Disclosure of detailed information about borrowings [line items]  
Gross debt 488,057
Transaction cost (12,419)
Net debt R$ 475,638