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Defined Benefit Pension and Other Postretirement Plans (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract] |  |
Contribution made to Pension Plan | $ 2.8 us-gaap_DefinedBenefitPlanContributionsByEmployer | $ 3.5 us-gaap_DefinedBenefitPlanContributionsByEmployer
Expected contribution to pensions plans during remainder of fiscal year | 8.3 us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInCurrentFiscalYear |
Net cost to sponsor unfunded and non-qualified supplemental executive retirement plans | $ 0.7 ugi_NetCostsForUnfundedAndNonQualifiedSupplementalExecutiveRetirementPlans | $ 0.8 ugi_NetCostsForUnfundedAndNonQualifiedSupplementalExecutiveRetirementPlans

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- Definition Net costs for unfunded and non-qualified supplemental executive retirement plans. + References No definition available. + Details
Name: | ugi_NetCostsForUnfundedAndNonQualifiedSupplementalExecutiveRetirementPlans
Namespace Prefix: | ugi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanContributionsByEmployer
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration