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Trade accounts receivables - Breakdown of balances (Details) - Trade accounts receivable - BRL (R$) R$ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
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Trade Accounts Receivables [Line Items] |  |
Current financial assets | R$ 7,287,028 | R$ 9,132,860
Factoring of receivables [member] |  |
Trade Accounts Receivables [Line Items] |  |
Current financial assets | 5,698,878 | 6,821,539
Expected credit losses |  |
Trade Accounts Receivables [Line Items] |  |
Current financial assets | (68,436) | (30,300)
Country of domicile | Accumulated cost | Third party |  |
Trade Accounts Receivables [Line Items] |  |
Current financial assets | 1,688,852 | 1,989,455
Country of domicile | Accumulated cost | Total for all related parties |  |
Trade Accounts Receivables [Line Items] |  |
Current financial assets | 81,018 | 83,343
Foreign countries | Accumulated cost | Third party |  |
Trade Accounts Receivables [Line Items] |  |
Current financial assets | 5,585,594 | 7,090,160
Foreign countries | Accumulated cost | Total for all related parties |  |
Trade Accounts Receivables [Line Items] |  |
Current financial assets |  | R$ 202

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