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Commitments - Insurance coverage (Detail) - 12 months ended Dec. 31, 2019 R$ in Millions, $ in Millions | BRL (R$) | USD ($)
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Oxiteno [member] |  |
Summary of contract commitments [line items] |  |
Maximum compensation value | R$ 4,603 | $ 1,142
Ipiranga [member] |  |
Summary of contract commitments [line items] |  |
Maximum compensation value | 1,025 |
Ultracargo [member] |  |
Summary of contract commitments [line items] |  |
Maximum compensation value | 949 |
Ultragaz [member] |  |
Summary of contract commitments [line items] |  |
Maximum compensation value | 266 |
Extrafarma [member] |  |
Summary of contract commitments [line items] |  |
Maximum compensation value | R$ 160 |

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- Definition The amount of income arising from insurance contracts. [Refer: Types of insurance contracts [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 4 -IssueDate 2019-01-01 -Paragraph 37 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2019-en-b&anchor=para_37_b&doctype=Standard&book=b -URIDate 2019-03-27 + Details
Name: | ifrs-full_IncomeArisingFromInsuranceContracts
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Summary of contract commitments. + References No definition available. + Details
Name: | ugp_SummaryOfContractCommitmentsLineItems
Namespace Prefix: | ugp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | ifrs-full_SegmentsAxis=ugp_IpirangaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_SegmentsAxis=ugp_UltracargoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_SegmentsAxis=ugp_UltragazMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_SegmentsAxis=ugp_ExtrafarmaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |