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Common Stock and Equity-Based Compensation - AmeriGas Common Unit Based Awards in Common Units and Cash (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
AmeriGas Performance Unit
Share-based Compensation Arrangement by Share-based Payment Award
Number of Common Units subject to original awards granted (in shares)	44,800	55,750	41,251
Fiscal year granted	2013	2012	2011
Payment of awards:
AmeriGas Partners Common Units issued, net of units withheld for taxes (in shares)	23,017	0	0
Cash paid	$ 1.7	$ 0.0	$ 0.0
AmeriGas Partners Common Units
Share-based Compensation Arrangement by Share-based Payment Award
Number of Common Units subject to original awards granted (in shares)	20,336	42,532	72,023
Payment of awards:
AmeriGas Partners Common Units issued, net of units withheld for taxes (in shares)	9,272	21,509	40,842
Cash paid	$ 0.4	$ 0.8	$ 1.4

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Aggregate cash paid by the entity during the period to settle equity instruments granted under equity-based payment arrangements.

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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

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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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