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Recoverable taxes - Roll-forward of provision for loss (Details) - BRL (R$)
R$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Recoverable Taxes [Abstract]    
Opening Balance R$ 1,581,961 R$ 1,452,435
Increase in Provision for Impairment of Value Added Tax on Sales and Services Credits (201,049) (316,741)
Decrease In Provision For Impairment Of Value Added Tax On Sales And Services Credits Due To Recovery Of Credits 117,109 186,014
Provision For Impairment Of Value Added Tax On Sales And Services Credits, Write-Off 1,201
Closing Balance R$ 1,665,901 R$ 1,581,961