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Intangible Assets - Amortization expenses (Detail) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Intangible assets details 2 [abstract]
Inventories and cost of products and services sold	R$ 11,183	R$ 15,044	R$ 2,165
Selling and marketing	3,872	8,920	11,689
General and administrative	105,437	75,370	57,369
Total, amortization	R$ 120,492	R$ 99,334	R$ 71,223

X

- Definition

The amount of amortisation expense. Amortisation is the systematic allocation of depreciable amounts of intangible assets over their useful lives.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2019-03-27

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of amortisation expense recognized as General and administrative.

+ References

No definition available.

+ Details

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Namespace Prefix:	ugp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Intangible assets details 2.

+ References

No definition available.

+ Details

Name:	ugp_IntangibleAssetsDetails2Abstract
Namespace Prefix:	ugp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of amortisation expense recognized as Inventories and cost of products and services sold.

+ References

No definition available.

+ Details

Name:	ugp_InventoriesAndCostOfProductsAndServicesSoldAmortisation
Namespace Prefix:	ugp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of amortisation expense recognized as Selling and marketing.

+ References

No definition available.

+ Details

Name:	ugp_SellingAndMarketingAmortisation
Namespace Prefix:	ugp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration