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Intangible Assets - Amortization expenses (Detail) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Intangible assets details 2 [abstract] |  |  |
Inventories and cost of products and services sold | R$ 9,575 | R$ 11,183 | R$ 15,044
Selling and marketing | 7,825 | 3,872 | 8,920
General and administrative | 165,281 | 105,437 | 75,370
Amortization expense | R$ 182,681 | R$ 120,492 | R$ 99,334

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- Definition The amount of amortisation expense. Amortisation is the systematic allocation of depreciable amounts of intangible assets over their useful lives. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of amortisation expense recognized as General and administrative. + References No definition available. + Details
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Namespace Prefix: | ugp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Intangible assets details 2. + References No definition available. + Details
Name: | ugp_IntangibleAssetsDetails2Abstract
Namespace Prefix: | ugp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of amortisation expense recognized as Inventories and cost of products and services sold. + References No definition available. + Details
Name: | ugp_InventoriesAndCostOfProductsAndServicesSoldAmortisation
Namespace Prefix: | ugp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of amortisation expense recognized as Selling and marketing. + References No definition available. + Details
Name: | ugp_SellingAndMarketingAmortisation
Namespace Prefix: | ugp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration