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14. FINANCIAL INSTRUMENTS (Details 10) - Foreign exchange risk [member]
R$ in Thousands
12 Months Ended
Dec. 31, 2020
BRL (R$)
Disclosure of detailed information about financial instruments [line items]  
Appreciation asset position R$ 501,066
Appreciation liability position (606,430)
Fair value market amoount receivable / payable (105,364)
Impact on financial income (expenses) R$ (115,815)
Exchange rate swap dollar x euro [member]  
Disclosure of detailed information about financial instruments [line items]  
Maturity 04/26/2021 to 06/08/2021
Functional Currency Dollar
Notional amount R$ 17,377
Appreciation asset position 90,315
Appreciation liability position (93,823)
Fair value market amoount receivable / payable (3,508)
Impact on financial income (expenses) R$ (4,749)
Exchange rate swap Dollar x Euro [member]  
Disclosure of detailed information about financial instruments [line items]  
Maturity 01/06/2021 a 06/11/2021
Functional Currency Dollar
Notional amount R$ 23,320
Appreciation asset position 121,207
Appreciation liability position (125,528)
Fair value market amoount receivable / payable (4,321)
Impact on financial income (expenses) (4,321)
Total dollar-to-euro swap [member]  
Disclosure of detailed information about financial instruments [line items]  
Notional amount 40,697
Appreciation asset position 211,522
Appreciation liability position (219,351)
Fair value market amoount receivable / payable (7,829)
Impact on financial income (expenses) R$ (9,070)
Exchange rate swap GBP x euro [member]  
Disclosure of detailed information about financial instruments [line items]  
Maturity Settled
Functional Currency GBP
Notional amount R$ 3,956
Impact on financial income (expenses) (602)
Total Swap GBP x Euro [member]  
Disclosure of detailed information about financial instruments [line items]  
Notional amount 3,956
Impact on financial income (expenses) R$ (602)
Exchange rate swap CDI x dollar [member]  
Disclosure of detailed information about financial instruments [line items]  
Maturity 2/10/2023
Functional Currency Dollar
Notional amount R$ (67,000)
Appreciation asset position 289,544
Appreciation liability position (387,079)
Fair value market amoount receivable / payable (97,535)
Impact on financial income (expenses) (106,143)
Total Swap CDI x dollar [member]  
Disclosure of detailed information about financial instruments [line items]  
Notional amount (67,000)
Appreciation asset position 289,544
Appreciation liability position (387,079)
Fair value market amoount receivable / payable (97,535)
Impact on financial income (expenses) R$ (106,143)