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Risks and Financial Instruments - Assets and liabilities in foreign currencies (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Liabilities in foreign currency |  |
Financing in foreign currency, gross of transaction costs and discount | R$ (5,515.6) | R$ (4,416.2)
Payables arising from imports, net of advances to foreign suppliers | (567.7) | (173.1)
Liabilities in foreign currency | (6,083.3) | (4,589.3)
Foreign currency hedging instruments | 2,483.0 | 1,777.6
Net liability position - Total | (1,726.1) | (1,430.4)
Net asset (liability) position - Income statement effect | 282.7 | (26.1)
Net liability position - Equity effect | (2,008.8) | (1,404.3)
Cash, cash equivalents and financial investments in foreign currency (except hedging instruments) | 254.2 | 236.4
Foreign trade receivables, net of allowance for doubtful accounts and advances to foreign customers | 235.1 | 214.9
Other net assets in foreign (except cash, cash equivalents, financial investments, trade receivables, financing, and payables) | 1,384.9 | 930.0
Assets in foreign currency | R$ 1,874.2 | R$ 1,381.3

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- Definition Assets in foreign currency. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Investment that provides a return in the form of fixed periodic payments and the eventual return of principal at maturity. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Disclosure of further information and subclassifications of Financing, classified in a manner appropriate to the entity's policies and operations. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition The gains (losses) on Foreign currency hedging instruments. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount due from Foreign trade receivables, net of allowance for doubtful accounts and advances to foreign customers. + References No definition available. + Details
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- Definition Liabilities in foreign currency. + References No definition available. + Details
Name: | ugp_LiabilitiesInForeignCurrency
Namespace Prefix: | ugp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Liabilities in foreign currency abstract. + References No definition available. + Details
Name: | ugp_LiabilitiesInForeignCurrencyAbstract
Namespace Prefix: | ugp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Net asset (liability) position - Income statement effect. + References No definition available. + Details
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Namespace Prefix: | ugp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Net asset (liability) position - Shareholders' equity effect. + References No definition available. + Details
Name: | ugp_NetAssetLiabilityPositionShareholdersEquityEffect
Namespace Prefix: | ugp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Net asset (liability) position - Total. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Other net assets in foreign except cash cash equivalents financial investments trade receivables financing and payables. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition The amount of current trade payables for foreign suppliers arising from imports, net of advances to foreign suppliers. + References No definition available. + Details
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Namespace Prefix: | ugp_
Data Type: | xbrli:monetaryItemType
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Period Type: | instant