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Summary of Significant Accounting Policies - Refundable Tank and Cylinder Deposits (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Sep. 30, 2017
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Accounting Policies [Abstract] |  |
Customer paid deposits primarily on owned tanks and cylinders | $ 272.0 | $ 279.9

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- Definition Foreign subsidiary tank and cylinder customer deposits. + References No definition available. + Details
Name: | ugi_ForeignSubsidiaryCustomerDeposits
Namespace Prefix: | ugi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration