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Employee benefits plans - Roll-forward of actuarial liability (Details) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of defined benefit plans [line items]    
Opening Balance R$ 833,683 R$ 691,424
Interest on actuarial liabilities 73,853 67,272
Current service cost 1,997 1,959
Actuarial loss – experience (125) 57,765
Actuarial loss (gain) – financial assumptions 137,649 70,762
Benefits paid directly by entity (50,199) (55,499)
Closing Balance R$ 721,560 R$ 833,683