Intangible Assets - Balances of goodwill (Parenthetical) (Detail) - BRL (R$) R$ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Disclosure of foreign subsidiaries [line items]
Goodwill	R$ 931,808	R$ 931,808
at Ultrapar [member]
Disclosure of foreign subsidiaries [line items]
Goodwill	R$ 246,163

An entity shall disclose the carrying amount of goodwill allocated to the unit (group of units).

No definition available.

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