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Shareholders' equity (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Amounts recognised as of acquisition date for each major class of assets acquired and liabilities assumed [abstract]    
Identifiable assets acquired (liabilities assumed)   R$ (373,153)
Consideration transferred, acquisition-date fair value   733,604
Determining goodwill from expected future profitability    
Consideration transferred, acquisition-date fair value   733,604
Goodwill recognised as of acquisition date   R$ 213,123
Inversiones Disal Emergencias S.A.    
Amounts recognised as of acquisition date for each major class of assets acquired and liabilities assumed [abstract]    
Cash and cash equivalents recognised as of acquisition date R$ (1,005)  
Other assets 25,650  
Other liabilities (323)  
Identifiable assets acquired (liabilities assumed) (26,332)  
Consideration transferred, acquisition-date fair value 144,430  
Cash flow on acquisitions of companies with shareholders 143,425  
Determining goodwill from expected future profitability    
Consideration transferred, acquisition-date fair value 144,430  
Goodwill recognised as of acquisition date R$ 118,098  
Percentage of voting equity interests acquired 100.00%