Cash and Cash Equivalents and Financial Investments - Financial investments (Detail) - BRL (R$) R$ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Cash and cash equivalents and financial investments details1 [abstract]
Financial investments in local currency, fixed-income securities and funds	R$ 2,537,315	R$ 1,153,040
Financial investments in foreign currency, fixed-income securities and funds	154,811	129,131
Currency and interest rate hedging instruments	363,329	85,753
Total financial investments	3,055,455	1,367,924
Current	2,853,106	1,283,498
Non-current	R$ 202,349	R$ 84,426

A financial asset is any asset that is: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favorable to the entity; or (d) a contract that will or may be settled in the entity's own equity instruments and is: (i) a non-derivative for which the entity is or may be obliged to receive a variable number of the entity's own equity instruments; or (ii) a derivative that will or may be settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity's own equity instruments.

No definition available.

Name:	ugp_FinancialInvestments
Namespace Prefix:	ugp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant