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Summary of Significant Accounting Policies - Estimated Useful Lives by Type (Details) | 12 Months Ended
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Sep. 30, 2018
Buildings and improvements | Minimum |
Property, Plant and Equipment |
Useful life (in years) | 10 years
Buildings and improvements | Maximum |
Property, Plant and Equipment |
Useful life (in years) | 40 years
Equipment, primarily cylinders and tanks | Minimum |
Property, Plant and Equipment |
Useful life (in years) | 5 years
Equipment, primarily cylinders and tanks | Maximum |
Property, Plant and Equipment |
Useful life (in years) | 30 years
Electricity generation facilities | Minimum |
Property, Plant and Equipment |
Useful life (in years) | 25 years
Electricity generation facilities | Maximum |
Property, Plant and Equipment |
Useful life (in years) | 40 years
Pipeline and related assets | Minimum |
Property, Plant and Equipment |
Useful life (in years) | 25 years
Pipeline and related assets | Maximum |
Property, Plant and Equipment |
Useful life (in years) | 40 years
Transportation equipment and office furniture and fixtures | Minimum |
Property, Plant and Equipment |
Useful life (in years) | 3 years
Transportation equipment and office furniture and fixtures | Maximum |
Property, Plant and Equipment |
Useful life (in years) | 10 years
Computer software | Minimum |
Property, Plant and Equipment |
Useful life (in years) | 1 year
Computer software | Maximum |
Property, Plant and Equipment |
Useful life (in years) | 10 years

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingAndBuildingImprovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=ugi_EquipmentPrimarilyCylindersAndTanksMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_ElectricGenerationTransmissionAndDistributionEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_PipelinesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=ugi_TransportationEquipmentAndOfficeFurnitureAndFixturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_SoftwareAndSoftwareDevelopmentCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |