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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, 2020	Dec. 31, 2019	Dec. 31, 2018
Shareholders equity details [abstract]
Beginning balance			R$ 284,024
Provisions	R$ 710,206	R$ 329,106
Payments	(284,767)	(596,436)
Ending balance	R$ 442,133	R$ 16,694
Expired dividends			R$ (3,170)

X

- Definition

Current dividend payables beginning balance.

+ References

No definition available.

+ Details

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Namespace Prefix:	ugp_
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Balance Type:	credit
Period Type:	duration

X

- Definition

Current dividend payables ending balance.

+ References

No definition available.

+ Details

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Namespace Prefix:	ugp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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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.

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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
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Shareholders equity details.

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No definition available.

+ Details

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Namespace Prefix:	ugp_
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Balance Type:	na
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