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Schedule of debt levels and net debt (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2021
Sep. 30, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
Derivative financial instruments liabilities, Current R$ 327,443   R$ 384,969
Derivative financial instruments liabilities, non current 41,861   727
Derivative financial instruments liabilities 369,304   385,696
Cash and cash equivalents 7,528,820   7,576,625
Current restricted cash and cash equivalents 24,963   1
Non-current restricted cash and cash equivalents 1   24,357
Liquidity risk [member]      
IfrsStatementLineItems [Line Items]      
Foreign currency loans and borrowings, current (2,166,249)    
Foreign currency loans and borrowings, non current (14,177,303)    
Foreign currency loans and borrowings (16,343,552)   (15,739,134)
Local currency loans and borrowings, current (1,036,819)    
Local currency loans and borrowings, non current (8,075,659)    
Local currency loans and borrowings (9,112,478)   (6,665,292)
Derivative financial instruments liabilities, Current (192,892)    
Derivative financial instruments liabilities, non current (31,057)    
Derivative financial instruments liabilities (223,949)   (7,706)
Gross debt, Current (3,395,960)    
Gross debt, non current (22,284,019)    
Gross debt (25,679,979)   (22,412,132)
Cash and cash equivalents, current 7,528,820    
Cash and cash equivalents, non current    
Cash and cash equivalents 7,528,820   7,576,625
MarketableSecurities, current 346,855    
Marketable securities, non current 447,413    
Marketable securities 794,268   658,735
Current restricted cash and cash equivalents 24,963    
Non-current restricted cash and cash equivalents   R$ 1  
Restricted cash and cash equivalents   R$ 24,964 24,358
Gross debt, current 7,900,638    
Gross debt, non current 447,414    
Gross debt 8,348,052   8,259,718
Net debt current 4,504,678    
Net debt, non current (21,836,605)    
Net debt R$ (17,331,927)   R$ (14,152,414)