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Equity - Disclosure - Equity - Summary of Balances and Changes in Consolidated Dividends Payable (Detail) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Shareholders equity details [abstract]
Beginning balance		R$ 320,883
Provisions	R$ 756,952	961,241
Payments	(808,603)	(940,250)
Expired dividends	(3,170)	(3,029)	R$ (9,868)
Ending balance	R$ 284,024	R$ 338,845

X

- Definition

Current dividend payables beginning balance.

+ References

No definition available.

+ Details

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

X

- Definition

Current dividend payables ending balance.

+ References

No definition available.

+ Details

Name:	ugp_CurrentDividendPayablesEndingBalance
Namespace Prefix:	ugp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Dividend payments.

+ References

No definition available.

+ Details

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

X

- Definition

Dividend provision amount.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of expired dividends.

+ References

No definition available.

+ Details

Name:	ugp_ExpiredDividends
Namespace Prefix:	ugp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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