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Loans and Debentures - Summary of Collateral to Financial Institutions (Detail) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Oxiteno [member]
Statement [line items]
Maximum amount of future payments related to these collaterals	R$ 2,753	R$ 2,750
Maturities of up to	4 months	3 months
Fair value of collaterals	R$ 68	R$ 68
IPP [member]
Statement [line items]
Maximum amount of future payments related to these collaterals	R$ 81,344
Maturities of up to	60 months
Fair value of collaterals	R$ 1,237

X

- Definition

Collateral future payments maturity period.

+ References

No definition available.

+ Details

Name:	ugp_CollateralFuturePaymentsMaturityPeriod
Namespace Prefix:	ugp_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Guarantee liabilities.

+ References

No definition available.

+ Details

Name:	ugp_GuaranteeLiabilities
Namespace Prefix:	ugp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Maximum potential amount of future payments on Guarantees

+ References

No definition available.

+ Details

Name:	ugp_MaximumPotentialAmountOfFuturePaymentsOnGuarantees
Namespace Prefix:	ugp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- 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
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=ugp_IpirangaProdutosdePetroleoSAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: