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Related Parties - Changes of Number of Shares Granted (Detail) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Related parties details 3 [abstract]
Share granted, beginning	1,700,128	2,366,796
Cancellation of granted shares due to termination of executive employment		(433,332)
Shares vested and transferred	(475,604)	(233,336)
Share granted, ending	1,224,524	1,700,128

X

- Definition

Cancellation of granted shares due to termination of executive employment.

+ References

No definition available.

+ Details

Name:	ugp_CancellationOfGrantedSharesDueToTerminationOfExecutiveEmployment
Namespace Prefix:	ugp_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Related parties details 3.

+ References

No definition available.

+ Details

Name:	ugp_RelatedPartiesDetails3Abstract
Namespace Prefix:	ugp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Share options granted in sharebased payment arrangement.

+ References

No definition available.

+ Details

Name:	ugp_ShareOptionsGrantedInSharebasedPaymentArrangement
Namespace Prefix:	ugp_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of shares vested and transferred in a share-based payment arrangement.

+ References

No definition available.

+ Details

Name:	ugp_SharesVestedTransferredDuringPeriodSharebasedPaymentArrangement
Namespace Prefix:	ugp_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration