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Management of financial risks and financial instruments - Summary of sensitivity analysis (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Disclosure of sensitivity analysis [Line Items]    
Sensitivity analysis increase decrease in one percent R$ (1,341) R$ (6,515)
Sensitivity analysis increase decrease in twenty five percent (167,453) (128,867)
Sensitivity analysis increase decrease in fifty percent (389,862) (283,088)
Pre-fixed interest rate [Member] | Pre-fixed interest rate in Reais [Member]    
Disclosure of sensitivity analysis [Line Items]    
Sensitivity analysis increase decrease in one percent (180) (117)
Sensitivity analysis increase decrease in twenty five percent (224,381) (8,285)
Sensitivity analysis increase decrease in fifty percent (408,016) 50,065
Exchange coupons [Member] | Foreign currencies coupon rate [Member]    
Disclosure of sensitivity analysis [Line Items]    
Sensitivity analysis increase decrease in one percent (45) (28)
Sensitivity analysis increase decrease in twenty five percent (14,686) (6,905)
Sensitivity analysis increase decrease in fifty percent (40,330) (15,497)
Foreign currencies [Member] | Exchange rate [Member]    
Disclosure of sensitivity analysis [Line Items]    
Sensitivity analysis increase decrease in one percent (46) (124)
Sensitivity analysis increase decrease in twenty five percent 82,143 64,512
Sensitivity analysis increase decrease in fifty percent 49,374 148,169
Price index [Member] | Inflation coupon rate [Member]    
Disclosure of sensitivity analysis [Line Items]    
Sensitivity analysis increase decrease in one percent (303) (68)
Sensitivity analysis increase decrease in twenty five percent (48,538) (11,606)
Sensitivity analysis increase decrease in fifty percent (80,711) (24,563)
Shares [Member] | Shares prices [Member]    
Disclosure of sensitivity analysis [Line Items]    
Sensitivity analysis increase decrease in one percent (406) (5,858)
Sensitivity analysis increase decrease in twenty five percent 58,825 (162,112)
Sensitivity analysis increase decrease in fifty percent 150,146 (458,841)
Commodities [Member] | Commodities price [Member]    
Disclosure of sensitivity analysis [Line Items]    
Sensitivity analysis increase decrease in one percent (361) (320)
Sensitivity analysis increase decrease in twenty five percent (20,816) (4,471)
Sensitivity analysis increase decrease in fifty percent R$ (60,325) R$ 17,579