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Equity - Disclosure - Equity - Summary of Balances and Changes in Dividends Payable (Detail) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Shareholders equity details [abstract]
Beginning balance		R$ 338,845
Provisions	R$ 329,106	756,952
Payments	(596,436)	(808,603)
Expired dividends		(3,170)	R$ (3,029)
Ending balance	R$ 16,694	R$ 284,024

X

- Definition

Current dividend payables beginning balance.

+ References

No definition available.

+ Details

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Balance Type:	credit
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X

- Definition

Current dividend payables ending balance.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Dividend payments.

+ References

No definition available.

+ Details

Name:	ugp_DividendPayments
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Balance Type:	debit
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- Definition

Dividend provision amount.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of expired dividends.

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

Shareholders equity details.

+ References

No definition available.

+ Details

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Balance Type:	na
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