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30. Segment Information (Details 2) - BRL (R$) R$ in Thousands	Dec. 31, 2017	Dec. 31, 2016
SummaryOfSegmentInformationLineItems [Line Items]
Fixed and intangible assets	R$ 709,302	R$ 440,769
United States
SummaryOfSegmentInformationLineItems [Line Items]
Fixed and intangible assets	511,912	264,478
Mexico
SummaryOfSegmentInformationLineItems [Line Items]
Fixed and intangible assets	109,034	103,051
Uruguay
SummaryOfSegmentInformationLineItems [Line Items]
Fixed and intangible assets	65,876	67,251
Venezuela
SummaryOfSegmentInformationLineItems [Line Items]
Fixed and intangible assets	R$ 22,480	R$ 5,989

X

- Definition

Fixed and intangible assets.

+ References

No definition available.

+ Details

Name:	UGP_FixedAndIntangibleAssets
Namespace Prefix:	UGP_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	UGP_SummaryOfSegmentInformationLineItems
Namespace Prefix:	UGP_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_GeographicalAreasAxis=UGP_UnitedStatesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_GeographicalAreasAxis=UGP_MexicoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_GeographicalAreasAxis=UGP_UruguayMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_GeographicalAreasAxis=UGP_VenezuelaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: