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Provisions and contingent liabilities - Additional information (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Aug. 01, 2022
Apr. 01, 2022
Dec. 01, 2017
Disclosure of contingent liabilities [line items]          
Escrow deposits made under preliminary injunction R$ 600,259 R$ 569,415      
Possible contingency 4,013,392 3,601,865      
Contingent liabilities for tax matters and social security 3,148,222 2,656,479      
IPIContingency 185,388 182,446      
Legal Proceedings Related To Icms 1,380,424 1,376,199      
ICMS credits 149,061 201,408      
Reversal of alleged non-payment 196,693 178,825      
Reversal of inventory differences 282,254 302,143      
Reversal of conditioned fruition of fiscal incentive 193,912 193,785      
Offset claims and credit dis-allowances 1,394,010 759,469      
Amortization of goodwill paid on acquisition of subsidiary 251,789 233,805      
Contingent liabilities for civil, environmental and regulatory claims 624,653 690,052      
Penalty on Ultragaz 36,935 35,617      
Contingent liabilities for labor matters 240,515 255,334      
Surcharge on non-essential products 271,518 246,336      
Adjustment On Escrow Deposits R$ 62,217 R$ 26,969      
Subsidiary IPP [member]          
Disclosure of contingent liabilities [line items]          
Surcharge rate on non-essential products 2.00% 2.00%      
Subsidiary IPP [member] | Receivables Investment Fund (“FIDC”)          
Disclosure of contingent liabilities [line items]          
Percentage of receivables from an action for damages as contingent asset   90.00%      
Action for damages as a contingent asset, initial fixed amount recognized   R$ 140,000      
Action for damages as a contingent asset, amount received   60,000      
Action for damages as contingent asset, remaining portion will be received   80,000      
Cia Ultragaz [member]          
Disclosure of contingent liabilities [line items]          
Contingent liabilities for civil, environmental and regulatory claims R$ 113,756 255,290      
Discontinued operations | Oxiteno S. A. Industria e Comercio [member]          
Disclosure of contingent liabilities [line items]          
Provision for indemnities       R$ 168,568  
Provision for indemnities related to labor claims       92,823  
Provision for indemnities related to civil claims       17,584  
Provision for indemnities related to tax claims       R$ 58,160  
Discontinued operations | Extrafarma [member]          
Disclosure of contingent liabilities [line items]          
Provision for indemnities     R$ 35,075    
Provision for indemnities related to labor claims     16,259    
Provision for indemnities related to civil claims     6,420    
Provision for indemnities related to tax claims     R$ 12,395    
Chevron and subsidiary IPP [member]          
Disclosure of contingent liabilities [line items]          
Liability provisions 29,022 26,010      
Contingent liabilities for labor matters 3,030        
Contingent liabilities for tax assessments on sales 25,777        
Chevron and subsidiary IPP [member] | Subsidiary IPP [member]          
Disclosure of contingent liabilities [line items]          
Liability provisions R$ 95,905 R$ 100,548     R$ 198,900