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Equity - Dividends and Allocation of Net Income (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2018
Shareholders equity details [abstract]
Legal reserve as percentage of net income	5.00%

X

- Definition

Legal reserve as percentage of net income

+ References

No definition available.

+ Details

Name:	ugp_LegalReserveAsPercentageOfNetIncome
Namespace Prefix:	ugp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Shareholders equity details.

+ References

No definition available.

+ Details

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