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Inventories - Roll-forward of estimated losses (Details) - BRL (R$)
R$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Inventories [Line Items]    
Opening Balance R$ 97,934 R$ 95,053
Additional allowance recognised in profit or loss, allowance account for credit losses 30,683 83,705
Reversal Allowance Account For Credit Losses Financial Assets 6,652 6,352
Utilisation Allowance Account For Credit Losses Financial Assets 17,756 74,472
Closing Balance R$ 104,209 R$ 97,934