13. Intangible Assets (Details 2) - BRL (R$) R$ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Intangible Assets Details 2
Inventories and cost of products and services sold	R$ 29,344	R$ 14,593	R$ 11,522
Selling and marketing	484,609	492,973	436,253
General and administrative	57,758	47,358	42,689
Total, amortization	R$ 571,711	R$ 554,924	R$ 490,464

The amount of amortisation expense recognized as General and administrative.

No definition available.

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

- References

No definition available.

+ Details

Name:	UGP_IntangibleAssetsDetails2Abstract
Namespace Prefix:	UGP_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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

- 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

- 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 2016-01-13
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_112_c&doctype=Standard
-URIDate 2016-03-31

+ Details

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