Common Stock And Equity Based Compensation (Details 8) (AmeriGas Performance Unit [Member], USD $) In Millions, except Share data	12 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
AmeriGas Performance Unit [Member]
AmeriGas Common Unit based awards in common Units and cash
Number of common units subject to original awards granted	41,064	49,650	38,350
Fiscal year granted	2008	2007	2006
Payment of Awards:
AmeriGas Partners common Units issued	35,787	42,121	36,437
Cash Paid	$ 1.2	$ 1.2	$ 0.9

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