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Business combinations - Schedule of the provisional balances of assets acquired and liabilities assumed on the acquisition date (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Oct. 01, 2022
Sep. 12, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Comprised by          
Contingent consideration to be settled     R$ 89,640    
Net cash outflow resulting from the acquisition          
Total     R$ 5,985 R$ 0 R$ 0
Ultragaz Comercial Ltda [member] | Stella GD Intermediação de Geração Distribuída de Energia Ltda [member]          
Assets          
Cash and cash equivalents R$ 1,586        
Receivables 17        
Other receivables 119        
Property, plant and equipment 515        
Intangible assets 902        
Goodwill based on expected future profitability 99,679        
Liabilities          
Trade payables 14        
Salaries and related charges 217        
Taxes payable 9        
Other payables 5,378        
Acquisition value 97,200        
Comprised by          
Cash 7,560        
Contingent consideration to be settled 89,640        
Total consideration 97,200        
Net cash outflow resulting from the acquisition          
Consideration in cash 7,560 R$ 7,600      
Cash and cash equivalents acquired (1,586)        
Total R$ 5,974