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Financial instruments - Fair Value Maturity Schedule (Details) - BRL (R$) R$ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Disclosure of detailed information about financial instruments [line items] |  |
Fair value in R$ | R$ 493,113 | R$ (6,567,720)
2025 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Fair value in R$ | 176,214 | (1,753,846)
2026 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Fair value in R$ | 448,898 | (1,699,768)
2027 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Fair value in R$ | 741,124 | (36,905)
2028 onwards |  |
Disclosure of detailed information about financial instruments [line items] |  |
Fair value in R$ | R$ (873,123) | R$ (3,077,201)

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