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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 | 12 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
UGI Performance Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Number of original awards granted (in shares) | 178,450 | 308,362 | 294,300
Fiscal year granted | 2014 | 2013 | 2012
Payment of awards: |  |  |
Shares of UGI Common Stock issued, net of shares withheld for taxes | 138,985 | 209,592 | 188,418
Cash paid | $ 10.9 | $ 13.9 | $ 13.3
UGI Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Number of original awards granted (in shares) | 43,699 | 51,037 | 67,419
Payment of awards: |  |  |
Shares of UGI Common Stock issued, net of shares withheld for taxes | 15,990 | 39,422 | 44,034
Cash paid | $ 0.3 | $ 0.7 | $ 0.8

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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=96867065&loc=d3e5070-113901 + 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=96867065&loc=d3e5070-113901 + Details
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