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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
	Jan. 02, 2017	Dec. 31, 2018	Dec. 31, 2017
Disclosure of contract assets [line items]
Initial balance	R$ 1,392,895	R$ 1,502,360	R$ 1,438,084
Additions	514,291	390,177	529,732
Amortization	(463,490)	(371,825)	(463,049)
Transfer	(5,612)	(2,235)	(2,407)
Final balance	1,438,084	1,518,477	1,502,360
Current	448,316	484,473	456,213
Non-current	989,768	1,034,004	1,046,147
Increase (decrease) due to application of IFRS 15 [member]
Disclosure of contract assets [line items]
Initial balance	R$ 1,392,895	R$ 1,502,360	1,438,084
Final balance			R$ 1,502,360

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 2018-01-01
-Paragraph 105
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_105&doctype=Standard
-URIDate 2018-03-16

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2018-01-01
-Paragraph 116
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_116_a&doctype=Standard
-URIDate 2018-03-16

+ 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 2018-01-01
-Paragraph 105
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_105&doctype=Standard
-URIDate 2018-03-16

+ 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 2018-01-01
-Paragraph 105
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_105&doctype=Standard
-URIDate 2018-03-16

+ 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

Name:	ugp_AmortizationOfContractAssetsRelatingToContractsWithCustomers
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

Name:	ugp_IncreaseDecreaseContractAssetsRelatingToContractsWithCustomers
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

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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: