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Contractual Assets with Customers - Exclusive Rights - Summary of Contractual Assets with Customers Exclusive Rights Balance and Changes (Detail) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of contract assets [line items]
Initial balance	R$ 1,465,989	R$ 1,518,477	R$ 1,502,360
Additions	549,085	330,068	390,177
Amortization	(289,436)	(355,250)	(371,825)
Transfer	(19,307)	(27,306)	(2,235)
Final balance	1,706,331	R$ 1,465,989	R$ 1,518,477
Current	478,908
Non-current	R$ 1,227,423

X

- Definition

The amount of an entity’s right to consideration in exchange for goods or services that the entity has transferred to a customer, when that right is conditioned on something other than the passage of time (for example, the entity’s future performance).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2019-01-01
-Paragraph 105
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2019-en-r&anchor=para_105&doctype=Standard
-URIDate 2019-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2019-01-01
-Paragraph 116
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2019-en-r&anchor=para_116_a&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_ContractAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of current contract assets. [Refer: Contract assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2019-01-01
-Paragraph 105
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2019-en-r&anchor=para_105&doctype=Standard
-URIDate 2019-03-27

+ Details

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

X

- Definition

The amount of non-current contract assets. [Refer: Contract assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2019-01-01
-Paragraph 105
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2019-en-r&anchor=para_105&doctype=Standard
-URIDate 2019-03-27

+ Details

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

X

- Definition

Amortization of contract assets relating to contracts with customers

+ References

No definition available.

+ Details

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

X

- Definition

Disclosure of contract assets.

+ References

No definition available.

+ Details

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

X

- Definition

Increase decrease contract assets relating to contracts with customers

+ References

No definition available.

+ Details

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

X

- Definition

Transfer of contract assets relating to contracts with customers

+ References

No definition available.

+ Details

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