Segment Information (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013 Reportable_Segments States	Sep. 30, 2012
Segment Reporting [Abstract]
Number of Reportable Segments		6
Number of states to which product sale with propane revenue		50
General Partner's interest in AmeriGas OLP		1.01%
Gains (Losses) On Unsettled Commodity Derivative Instruments, Net	$ (18.0)	$ 7.4	$ 15.1