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Provisions and contingent liabilities - Additional information (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Oct. 21, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 01, 2017
Disclosure of contingent liabilities [line items]          
Unused provision reversed, other provisions   R$ 28,612      
Decrease through provision for tax matters reversed, escrow deposits R$ 621,009        
IPIContingency   194,508 R$ 185,388    
Legal Proceedings Related To Icms   1,357,445 1,380,424    
ICMS credits   94,640 149,061    
Reversal of alleged non-payment   154,914 196,693    
Reversal of inventory differences   279,448 282,254    
Reversal of conditioned fruition of fiscal incentive   191,549 193,912    
Offset claims and credit dis-allowances   2,049,421 1,394,010    
Amortization of goodwill paid on acquisition of subsidiary   266,619 251,789    
Surcharge on non-essential products   223,691 271,518    
Adjustment On Escrow Deposits   R$ 45,336 62,217 R$ 26,969  
Subsidiary IPP [member]          
Disclosure of contingent liabilities [line items]          
Surcharge rate on non-essential products   2.00%      
Cia Ultragaz [member]          
Disclosure of contingent liabilities [line items]          
Contingent liabilities for civil, environmental and regulatory claims   R$ 187,460 113,756    
Discontinued operations | Oxiteno S. A. Industria e Comercio [member]          
Disclosure of contingent liabilities [line items]          
Provision for indemnities   174,408 168,567    
Provision for indemnities related to labor claims   95,274 92,823    
Provision for indemnities related to civil claims   26,074 17,584    
Provision for indemnities related to tax claims   53,060 58,160    
Discontinued operations | Extrafarma [member]          
Disclosure of contingent liabilities [line items]          
Provision for indemnities   32,400 35,074    
Provision for indemnities related to labor claims   12,074 16,259    
Provision for indemnities related to civil claims   7,007 6,420    
Provision for indemnities related to tax claims   13,319 12,395    
Chevron and subsidiary IPP [member]          
Disclosure of contingent liabilities [line items]          
Liability provisions   36,146 29,022    
Contingent liabilities for labor matters   3,545 3,020    
Contingent liabilities for tax assessments on sales   32,380 25,777    
Chevron and subsidiary IPP [member] | Subsidiary IPP [member]          
Disclosure of contingent liabilities [line items]          
Liability provisions   R$ 89,952 R$ 95,905   R$ 198,900