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Schedule of cash and cash equivalents (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2021
Sep. 30, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
Cash   R$ 2,193,508 R$ 2,439,072
Cash equivalents R$ 7,528,820   7,576,625
United States of America, Dollars      
IfrsStatementLineItems [Line Items]      
Cash 946,790   1,185,208
United States of America, Dollars | Fixed Term Deposit [Member]      
IfrsStatementLineItems [Line Items]      
Cash equivalents 62,043   198,878
United States of America, Dollars | Overnight [Member]      
IfrsStatementLineItems [Line Items]      
Cash equivalents 701,386   1,220,232
Saudi Arabia, Riyals      
IfrsStatementLineItems [Line Items]      
Cash 312,728   250,879
Brazilian Reais [Member]      
IfrsStatementLineItems [Line Items]      
Cash 185,941   112,181
Cash equivalents 4,454,855   3,667,132
Brazilian Reais [Member] | Investment funds [member]      
IfrsStatementLineItems [Line Items]      
Cash equivalents 3,641   4,684
Brazilian Reais [Member] | Bank deposit certificates [Member]      
IfrsStatementLineItems [Line Items]      
Cash equivalents 4,451,214   3,662,448
Euro Member Countries, Euro      
IfrsStatementLineItems [Line Items]      
Cash 103,630   54,687
Turkey, New Lira      
IfrsStatementLineItems [Line Items]      
Cash 42,899   347,740
Others Currencies [Member]      
IfrsStatementLineItems [Line Items]      
Cash 601,520   488,377
Cash equivalents 880,457   1,470,421
Others Currencies [Member] | Fixed Term Deposit [Member]      
IfrsStatementLineItems [Line Items]      
Cash equivalents R$ 117,028   R$ 51,311