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Shareholders equity - Other reserves (Details) - BRL (R$)
R$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Disclosure of classes of share capital [line items]        
Equity at beginning of period     R$ 32,415,575 R$ 44,810,300
Exchange rate variations on conversion of financial information of the subsidiaries abroad R$ (33,755) R$ (33,607) (139,559) (11,335)
Equity at end of period 45,258,425 41,601,758 45,258,425 41,601,758
Other reserves        
Disclosure of classes of share capital [line items]        
Equity at beginning of period     1,348,796 1,538,296
Equity at end of period R$ 944,961 R$ 1,322,487 R$ 944,961 R$ 1,322,487