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13. Intangible Assets (Details 1) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
SummaryOfIntangibleAssetsLineItems [Line Items]
Goodwill	R$ 1,578,157	R$ 1,454,484
Extrafarma
SummaryOfIntangibleAssetsLineItems [Line Items]
Goodwill	R$ 661,553	661,553
Segment	Extrafarma
Ipiranga
SummaryOfIntangibleAssetsLineItems [Line Items]
Goodwill	R$ 276,724	276,724
Segment	Ipiranga
UniaoTerminais
SummaryOfIntangibleAssetsLineItems [Line Items]
Goodwill	R$ 211,089	211,089
Segment	Ultracargo
CBLSA
SummaryOfIntangibleAssetsLineItems [Line Items]
Goodwill	R$ 123,673	0
Segment	Ipiranga
Texaco
SummaryOfIntangibleAssetsLineItems [Line Items]
Goodwill	R$ 177,759	177,759
Segment	Ipiranga
Oxiteno Uruguay
SummaryOfIntangibleAssetsLineItems [Line Items]
Goodwill	R$ 44,856	44,856
Segment	Oxiteno
Temmar
SummaryOfIntangibleAssetsLineItems [Line Items]
Goodwill	R$ 43,781	43,781
Segment	Ultracargo
DNP
SummaryOfIntangibleAssetsLineItems [Line Items]
Goodwill	R$ 24,736	24,736
Segment	Ipiranga
Repsol
SummaryOfIntangibleAssetsLineItems [Line Items]
Goodwill	R$ 13,403	13,403
Segment	Ultragaz
Others
SummaryOfIntangibleAssetsLineItems [Line Items]
Goodwill	R$ 583	R$ 583
Segment	Oxiteno

X

- Definition

An entity shall disclose the carrying amount of goodwill allocated to the unit (group of units).

+ References

No definition available.

+ Details

Name:	UGP_AcquisitionsThroughBusinessCombinationsGoodwill
Namespace Prefix:	UGP_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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

X

- Details

Name:	ifrs-full_SegmentsAxis=UGP_ExtrafarmaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SegmentsAxis=UGP_IpirangaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SegmentsAxis=UGP_UniaoTerminaisMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SegmentsAxis=UGP_CBLSAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SegmentsAxis=UGP_TexacoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SegmentsAxis=UGP_OxitenoUruguayMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SegmentsAxis=UGP_TemmarMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SegmentsAxis=UGP_DNPMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SegmentsAxis=UGP_RepsolMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SegmentsAxis=UGP_OtherSegmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: