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4. Cash and Cash Equivalents and Financial Investments (Details) - BRL (R$) R$ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash And Cash Equivalents And Financial Investments Details
Cash and bank deposits in local currency	R$ 73,128	R$ 47,177
Cash and bank deposits in foreign currency	74,798	66,141
Financial investments considered cash equivalents in local currency, fixed income securities	4,821,605	3,837,807
Financial investments considered cash equivalents in foreign currency, fixed income securities	32,473	323,033
Total cash and cash equivalents	R$ 5,002,004	R$ 4,274,158	R$ 2,702,893	R$ 2,827,369

X

- Definition

The amount of cash on hand and bank deposits in foreign currency.

+ References

No definition available.

+ Details

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Balance Type:	credit
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X

- Definition

The amount of cash on hand and bank deposits in local currency.

+ References

No definition available.

+ Details

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Namespace Prefix:	UGP_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- References

No definition available.

+ Details

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X

- Definition

Investment that provides a return in the form of fixed periodic payments and the eventual return of principal at maturity.

+ References

No definition available.

+ Details

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Namespace Prefix:	UGP_
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X

- Definition

Investment in local currency that provides a return in the form of fixed periodic payments and the eventual return of principal at maturity.

+ References

No definition available.

+ Details

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Namespace Prefix:	UGP_
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X

- Definition

The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 7
-IssueDate 2016-01-13
-Paragraph 45
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2016-03-30&anchor=para_45&doctype=Standard
-URIDate 2016-03-31

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2016-01-13
-Paragraph B13
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2016-03-30&anchor=para_B13_a&doctype=Appendix&seq=2
-URIDate 2016-03-31

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2016-01-13
-Paragraph 54
-Subparagraph i
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_54_i&doctype=Standard
-URIDate 2016-03-31

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