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Loans, financing, debentures and hedge derivative financial instruments - Summary of Collateral to Financial Institutions (Detail) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
IPP [member] |  |
Statement [line items] |  |
Maximum amount of future payments related to these collaterals | R$ 330,944 | R$ 81,344
Maturities of up to | 46 months | 60 months
Fair value of collaterals | R$ 5,496 | R$ 1,237
Oxiteno [member] |  |
Statement [line items] |  |
Maximum amount of future payments related to these collaterals |  | R$ 2,753
Maturities of up to |  | 4 months
Fair value of collaterals |  | R$ 68

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- Definition Collateral future payments maturity period. + References No definition available. + Details
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Namespace Prefix: | ugp_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Guarantee liabilities. + References No definition available. + Details
Name: | ugp_GuaranteeLiabilities
Namespace Prefix: | ugp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Maximum potential amount of future payments on Guarantees + References No definition available. + Details
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Namespace Prefix: | ugp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | ugp_StatementLineItems
Namespace Prefix: | ugp_
Data Type: | xbrli:stringItemType
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=ugp_OxitenoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |