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Disclosure - Loans, financing, debentures and hedge derivative financial instruments - Summary of Debentures (Detail) | 1 Months Ended | 12 Months Ended
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Nov. 30, 2019 | Dec. 31, 2018 BRL (R$) | Mar. 31, 2018 | Oct. 31, 2017 BRL (R$) | Jul. 31, 2017 | Apr. 30, 2017 | May 31, 2016 | Dec. 31, 2020 BRL (R$)
Debentures first issue [member] | Tequimar [member] |  |  |  |  |  |  |  |
Summary of loans debentures and finance leases [line items] |  |  |  |  |  |  |  |
Simple nominative nonconvertible unsecured registered debentures | 90,000 |  |  |  |  |  |  |
Debentures fourth issue [member] | IPP [member] |  |  |  |  |  |  |  |
Summary of loans debentures and finance leases [line items] |  |  |  |  |  |  |  |
Simple nominative nonconvertible unsecured registered debentures |  |  |  |  |  |  | 500 |
Debentures fifth issue [member] | IPP [member] |  |  |  |  |  |  |  |
Summary of loans debentures and finance leases [line items] |  |  |  |  |  |  |  |
Second series simple nominative nonconvertible unsecured registered debentures |  |  |  |  |  | 352,361 |  |
Interest |  |  |  |  |  |  |  | 93.9% of DI
Debentures sixth issue [member] | IPP [member] |  |  |  |  |  |  |  |
Summary of loans debentures and finance leases [line items] |  |  |  |  |  |  |  |
Simple nominative nonconvertible unsecured registered debentures |  |  | 1,725,000 |  | 1,500,000 |  |  |
Debentures seventh issue [member] | IPP [member] |  |  |  |  |  |  |  |
Summary of loans debentures and finance leases [line items] |  |  |  |  |  |  |  |
Second series simple nominative nonconvertible unsecured registered debentures |  |  |  | 213,693 |  |  |  |
Amount: |  |  |  | R$ 944,077,000 |  |  |  |
Interest |  |  |  |  |  |  |  | 97.3% of DI
Debentures eighth issue [member] | IPP [member] |  |  |  |  |  |  |  |
Summary of loans debentures and finance leases [line items] |  |  |  |  |  |  |  |
Second series simple nominative nonconvertible unsecured registered debentures |  | 240,000 |  |  |  |  |  |
Amount: |  | R$ 900,000,000 |  |  |  |  |  |
Interest |  |  |  |  |  |  |  | 97.1% of DI
Debenture one [member] |  |  |  |  |  |  |  |
Summary of loans debentures and finance leases [line items] |  |  |  |  |  |  |  |
Face value unit |  |  |  |  |  |  |  | R$ 1,000,000,000
Final maturity |  |  |  |  |  |  |  | May 25, 2021
Payment of the face value |  |  |  |  |  |  |  | Annual as from May 2019
Interest |  |  |  |  |  |  |  | 105.0% of DI
Payment of interest |  |  |  |  |  |  |  | Semiannually
Reprice |  |  |  |  |  |  |  | Not applicable
Debenture two [member] |  |  |  |  |  |  |  |
Summary of loans debentures and finance leases [line items] |  |  |  |  |  |  |  |
Amount: |  |  |  |  |  |  |  | R$ 660,139,000
Face value unit |  |  |  |  |  |  |  | R$ 1,000,000
Final maturity |  |  |  |  |  |  |  | April 18, 2022
Payment of the face value |  |  |  |  |  |  |  | Lump sum at final maturity
Interest |  |  |  |  |  |  |  | 95.0% of DI
Payment of interest |  |  |  |  |  |  |  | Semiannually
Reprice |  |  |  |  |  |  |  | Not applicable
Debenture two [member] | Debentures fifth issue [member] | IPP [member] |  |  |  |  |  |  |  |
Summary of loans debentures and finance leases [line items] |  |  |  |  |  |  |  |
Second series simple nominative nonconvertible unsecured registered debentures |  |  |  |  |  | 660,139 |  |
Debenture three [member] |  |  |  |  |  |  |  |
Summary of loans debentures and finance leases [line items] |  |  |  |  |  |  |  |
Amount: |  |  |  |  |  |  |  | R$ 352,361,000
Face value unit |  |  |  |  |  |  |  | R$ 1,000,000
Final maturity |  |  |  |  |  |  |  | April 15, 2024
Payment of the face value |  |  |  |  |  |  |  | Lump sum at final maturity
Interest |  |  |  |  |  |  |  | IPCA + 4.68%
Payment of interest |  |  |  |  |  |  |  | Annually
Reprice |  |  |  |  |  |  |  | Not applicable
Debenture four [member] |  |  |  |  |  |  |  |
Summary of loans debentures and finance leases [line items] |  |  |  |  |  |  |  |
Face value unit |  |  |  |  |  |  |  | R$ 1,000,000
Final maturity |  |  |  |  |  |  |  | July 28, 2022
Payment of the face value |  |  |  |  |  |  |  | Annual as from July 2021
Interest |  |  |  |  |  |  |  | 105.0% of DI
Payment of interest |  |  |  |  |  |  |  | Annually
Reprice |  |  |  |  |  |  |  | Not applicable
Debenture five [member] |  |  |  |  |  |  |  |
Summary of loans debentures and finance leases [line items] |  |  |  |  |  |  |  |
Amount: |  |  |  |  |  |  |  | R$ 730,384,000
Face value unit |  |  |  |  |  |  |  | R$ 1,000,000
Final maturity |  |  |  |  |  |  |  | October 24, 2022
Payment of the face value |  |  |  |  |  |  |  | Lump sum at final maturity
Interest |  |  |  |  |  |  |  | 95.0% of DI
Payment of interest |  |  |  |  |  |  |  | Semiannually
Reprice |  |  |  |  |  |  |  | Not applicable
Debenture five [member] | Debentures seventh issue [member] | IPP [member] |  |  |  |  |  |  |  |
Summary of loans debentures and finance leases [line items] |  |  |  |  |  |  |  |
Second series simple nominative nonconvertible unsecured registered debentures |  |  |  | 730,384 |  |  |  |
Debenture six [member] |  |  |  |  |  |  |  |
Summary of loans debentures and finance leases [line items] |  |  |  |  |  |  |  |
Amount: |  |  |  |  |  |  |  | R$ 213,693,000
Face value unit |  |  |  |  |  |  |  | R$ 1,000,000
Final maturity |  |  |  |  |  |  |  | October 24, 2024
Payment of the face value |  |  |  |  |  |  |  | Lump sum at final maturity
Interest |  |  |  |  |  |  |  | IPCA + 4.34%
Payment of interest |  |  |  |  |  |  |  | Annually
Reprice |  |  |  |  |  |  |  | Not applicable
Debenture seven [member] |  |  |  |  |  |  |  |
Summary of loans debentures and finance leases [line items] |  |  |  |  |  |  |  |
Face value unit |  |  |  |  |  |  |  | R$ 1,000,000
Final maturity |  |  |  |  |  |  |  | March 5, 2023
Payment of the face value |  |  |  |  |  |  |  | Lump sum at final maturity
Interest |  |  |  |  |  |  |  | 105.25% of DI
Payment of interest |  |  |  |  |  |  |  | Semiannually
Reprice |  |  |  |  |  |  |  | Not applicable
Debenture eight [member] |  |  |  |  |  |  |  |
Summary of loans debentures and finance leases [line items] |  |  |  |  |  |  |  |
Amount: |  |  |  |  |  |  |  | R$ 660,000,000
Face value unit |  |  |  |  |  |  |  | R$ 1,000,000
Final maturity |  |  |  |  |  |  |  | December 18, 2023
Payment of the face value |  |  |  |  |  |  |  | Lump sum at final maturity
Interest |  |  |  |  |  |  |  | 97.5% of DI
Payment of interest |  |  |  |  |  |  |  | Semiannually
Reprice |  |  |  |  |  |  |  | Not applicable
Debenture eight [member] | Debentures eighth issue [member] | IPP [member] |  |  |  |  |  |  |  |
Summary of loans debentures and finance leases [line items] |  |  |  |  |  |  |  |
Second series simple nominative nonconvertible unsecured registered debentures |  | 660,000 |  |  |  |  |  |
Debenture nine [member] |  |  |  |  |  |  |  |
Summary of loans debentures and finance leases [line items] |  |  |  |  |  |  |  |
Amount: |  |  |  |  |  |  |  | R$ 240,000,000
Face value unit |  |  |  |  |  |  |  | R$ 1,000,000
Final maturity |  |  |  |  |  |  |  | December 15, 2025
Payment of the face value |  |  |  |  |  |  |  | Lump sum at final maturity
Interest |  |  |  |  |  |  |  | IPCA + 4.61%
Payment of interest |  |  |  |  |  |  |  | Annually
Reprice |  |  |  |  |  |  |  | Not applicable
Debenture ten [member] |  |  |  |  |  |  |  |
Summary of loans debentures and finance leases [line items] |  |  |  |  |  |  |  |
Face value unit |  |  |  |  |  |  |  | R$ 1,000,000
Final maturity |  |  |  |  |  |  |  | November 19, 2024
Payment of the face value |  |  |  |  |  |  |  | Lump sum at final maturity
Interest |  |  |  |  |  |  |  | 6.47%
Payment of interest |  |  |  |  |  |  |  | Semiannually
Reprice |  |  |  |  |  |  |  | Not applicable

X
- Definition Amount of Face value. + References No definition available. + Details
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Namespace Prefix: | ugp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition long-term consolidated debt had the following principal maturity schedule. + References No definition available. + Details
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Namespace Prefix: | ugp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Interest schedule. + References No definition available. + Details
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- Definition Percentage of payment of the face value. + References No definition available. + Details
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- Definition Payment of interest. + References No definition available. + Details
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Balance Type: | na
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- Definition Number of debentures distributed through public offer. + References No definition available. + Details
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- Definition Summary of loans debentures and finance leases. + References No definition available. + Details
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