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Summarized financial position of derivative financial instruments: (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]    
Derivative financial instruments assets R$ 145,355 R$ 377,990
Derivative financial instruments assets, Current 134,551 377,756
Derivative financial instruments assets, non current 10,804 234
Derivative financial instruments laibilities (369,304) (385,696)
Derivative financial instruments laibilities, Current (327,443) (384,969)
Derivative financial instruments laibilities, non current (41,861) (727)
Cash Flow Hedges Derivative Instruments [Member] | Currency Risk 1 [Member]    
IfrsStatementLineItems [Line Items]    
Derivative financial instruments assets 27,617 177,208
Derivative financial instruments laibilities (37,959) (81,650)
Cash Flow Hedges Derivative Instruments [Member] | Commodity price risk [member]    
IfrsStatementLineItems [Line Items]    
Derivative financial instruments assets 105,228 125,304
Derivative financial instruments laibilities (57,608) (269,361)
Not Designated Cash Flow Hedges [Member] | Currency Risk 1 [Member]    
IfrsStatementLineItems [Line Items]    
Derivative financial instruments assets 2,053 75,478
Derivative financial instruments laibilities R$ (233,172) (20,036)
Not Designated Cash Flow Hedges [Member] | Interest Rate Derivatives [Member]    
IfrsStatementLineItems [Line Items]    
Derivative financial instruments assets   10,457
Derivative financial instruments laibilities   R$ (14,649)