Acquisitions and Dispositions (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Finite Lived Intangible Asset Useful Life
Estimated useful life (in years)	15 years
Heritage Propane [Member]
Assets acquired:
Current assets		$ 301.4
Property, plant & equipment		890.2
Customer relationships (estimated useful life of 15 years)		418.9
Trademarks and tradenames		91.1	[1]
Goodwill		1,217.7	[1]
Other assets		9.9
Total assets acquired		2,929.2
Liabilities assumed:
Current liabilities		(238.1)
Long-term debt		(62.9)
Other noncurrent liabilities		(23.4)
Total liabilities assumed		(324.4)
Total		$ 2,604.8
Customer Relationships [Member] | Heritage Propane [Member]
Finite Lived Intangible Asset Useful Life
Estimated useful life (in years)	15 years	15 years

[1] During Fiscal 2013, the Partnership made a correcting adjustment to trademarks and tradenames and goodwill which is not reflected in the table above. See Note 12.