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Employee benefits and private pension plan - Sensitivity analysis (Detail)
R$ in Thousands
Dec. 31, 2024
BRL (R$)
Discount rate [Member]  
Disclosure of defined benefit plans [line items]  
Change in assumptions 1.00%
Decrease in liability R$ 19,736
Change in assumptions 1.00%
Increase in liability R$ 23,953
Salary growth rate [member]  
Disclosure of defined benefit plans [line items]  
Change in assumptions 1.00%
Decrease in liability R$ 284
Change in assumptions 1.00%
Increase in liability R$ 304
Medical services growth rate [Member]  
Disclosure of defined benefit plans [line items]  
Change in assumptions 1.00%
Decrease in liability R$ 18,385
Change in assumptions 1.00%
Increase in liability R$ 22,185