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14. Loans, Debentures, and Finance Leases (Details Narrative) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Loans Debentures And Finance Leases Details Narrative
Financing collateral	R$ 66,337	R$ 56,570
Promissory notes guarantees	9,587,971	7,069,482
Letters of credit for commercial and legal proceedings	237,537	215,988
Raw material guarantees	81,046	59,316
Maximum amount of future payments related to these collaterals	8,224	30,764
Fair value of collaterals recognized in current liabilities	R$ 205	R$ 743

X

- References

No definition available.

+ Details

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Namespace Prefix:	UGP_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	UGP_LettersOfCreditForCommercialAndLegalProceedings
Namespace Prefix:	UGP_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

Name:	UGP_PromissoryNotesGuarantees
Namespace Prefix:	UGP_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	UGP_RawMaterialGuarantees
Namespace Prefix:	UGP_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The fair value of collateral sold or repledged that was permitted to be sold or repledged in the absence of default by the owner of the collateral. [Refer: At fair value [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2016-01-13
-Paragraph 15
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2016-03-30&anchor=para_15_b&doctype=Standard
-URIDate 2016-03-31

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Balance Type:	debit
Period Type:	instant