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Property, plant and equipment - PPE held as collateral and Impairment (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about property, plant and equipment [abstract]    
Property, plant and equipment, pledged as security R$ 229,260 R$ 141,821
Discount rate applied to cash flow projections 11.80%  
Growth rate used to extrapolate cash flow projections 3.80%