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Financial instruments - Fair Value Maturity Schedule (Details) - BRL (R$)
R$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
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)