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Investment - Summary of provision for short-term liabilities (Detail) R$ in Thousands	12 Months Ended
	Dec. 31, 2020 BRL (R$)
Disclosure of joint ventures [abstract]
Balance as of December 31, 2019	R$ 0
Transfer to provision for short-term liabilities	2,096
Balance as of December 31, 2020	R$ 2,096

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- References

No definition available.

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Namespace Prefix:	ifrs-full_
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Balance Type:	na
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- Definition

The amount of non-current provision for short-term liabilities of joint venture.

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No definition available.

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Namespace Prefix:	ugp_
Data Type:	xbrli:monetaryItemType
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- Definition

The amount of transfer to provision for short-term liabilities pertaining to joint ventures.

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No definition available.

+ Details

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