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Trade receivables (Details 2) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Trade Receivables      
Balance at beginning of the year R$ 1,377,209 R$ 1,428,517 R$ 1,280,088
Constitution/(reversal) of losses 41,793 21,103 209,360
Recoveries (170,793) (72,411) (60,931)
Balance at the end of the year R$ 1,248,209 R$ 1,377,209 R$ 1,428,517