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Common Stock And Equity Based Compensation - Schedule of Payment for UGI Performance Unit and UGI Stock Unit Awards in Shares and Cash (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
UGI Performance Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Number of original awards granted | 331,038 | 328,025 | 316,125
Fiscal year granted | 2011 | 2010 | 2009
Payment of awards: |  |  |
Shares of UGI Common Stock issued | 174,168 | 97,622 | 0
Cash paid | $ 3.1 | $ 1.6 | $ 0
UGI Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Number of original awards granted | 34,639 | 54,269 | 49,347
Payment of awards: |  |  |
Shares of UGI Common Stock issued | 22,604 | 35,274 | 32,636
Cash paid | $ 0.4 | $ 0.5 | $ 0.2

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- Definition Number of company original awards granted. + References No definition available. + Details
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Namespace Prefix: | ugi_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Details
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- Definition Shares based compensation arrangement by share based payment award granted fiscal period. + References No definition available. + Details
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Namespace Prefix: | ugi_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

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- Definition Aggregate cash paid by the entity during the period to settle equity instruments granted under equity-based payment arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Details
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- Definition Number of share instruments newly issued under a share-based compensation plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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