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19. Provision for Asset Retirement Obligation - Fuel Tanks (Details) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Provision For Asset Retirement Obligation - Fuel Tanks Details
Initial balance	R$ 77,564	R$ 74,716	R$ 70,802
Additions (new tanks)	537	483	625
Expense with tanks removed	(15,432)	(2,785)	(3,949)
Accretion expense	2,105	5,150	7,238
Final balance	64,774	77,564	74,716
Current	4,799	4,563	5,232
Noncurrent	R$ 59,975	R$ 73,001	R$ 69,484

X

- Definition

Additions to Provision For Asset Retirement Obligation.

+ References

No definition available.

+ Details

Name:	UGP_AdditionProvisionAssetRetirementObligation
Namespace Prefix:	UGP_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Provision for legal obligations associated with the retirement of long-lived assets that result from the acquisition, construction, development and/or the normal operation of such assets.

+ References

No definition available.

+ Details

Name:	UGP_CurrentProvisionAssetRetirementObligation
Namespace Prefix:	UGP_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Provision for legal obligations associated with the retirement of long-lived assets that result from the acquisition, construction, development and/or the normal operation of such assets.

+ References

No definition available.

+ Details

Name:	UGP_NoncurrentProvisionAssetRetirementObligation
Namespace Prefix:	UGP_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Balance of Provision For Asset Retirement Obligation - Fuel Tanks Details. An entity shall disclose information about the assumptions it makes about the future, and other major sources of estimation uncertainty at the end of the reporting period, that have a significant risk of resulting in a material adjustment to the carrying amounts of assets and liabilities within the next financial year.

+ References

No definition available.

+ Details

Name:	UGP_ProvisionAssetRetirementObligation
Namespace Prefix:	UGP_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Accretion expense due to asset Retirement Obligation.

+ References

No definition available.

+ Details

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

X

- Definition

Expense with tanks removed due to asset Retirement Obligation.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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