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Energy Services Accounts Receivable Securitization Facility - Narrative (Details) - USD ($) | 6 Months Ended
--- | ---
Oct. 31, 2017 | Apr. 30, 2017
Forecast | Maximum |  |
Accounts, Notes, Loans and Financing Receivable |  |
Receivables facility | $ 75,000,000 | $ 150,000,000

X
- Definition Receivable purchase facility size. + References No definition available. + Details
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Namespace Prefix: | ugi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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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- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |