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Deferred Revenue - Additional Information (Detail) - store	Dec. 31, 2020	Dec. 31, 2019
am/pm [member]
Summary of deferred revenue [line items]
Number of stores	58	63
Jet Oil [member]
Summary of deferred revenue [line items]
Number of stores	45	46

X

- Definition

Number Of Stores1

+ References

No definition available.

+ Details

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Namespace Prefix:	ugp_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Summary of deferred revenue.

+ References

No definition available.

+ Details

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Namespace Prefix:	ugp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_ProductsAndServicesAxis=ugp_AmPmMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ProductsAndServicesAxis=ugp_JetOilMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: