Acquisitions (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended			0 Months Ended		12 Months Ended				12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Jan. 12, 2012 Heritage Propane	Jan. 12, 2012 Heritage Propane Customers gal	Sep. 30, 2012 Heritage Propane	Jan. 12, 2012 Energy Transfer Partners LP States	Jan. 12, 2012 Heritage Operating LP	Jan. 12, 2012 Titan Energy GP LLC	Sep. 30, 2014 AmeriGas OLP	Sep. 30, 2013 AmeriGas OLP	Sep. 30, 2012 AmeriGas OLP
Business Acquisition
Total consideration				$ 2,604,827
Cash included in the acquisition of propane operations				1,472,199
Common units issued					29,567,362
Common units included in the acquisition of propane operations				1,132,628
Number of states included in the propane operations (in states)							41
Annual delivery of propane by subsidiary (over 500 million gallons)					500,000,000
Retail propane customers (more than 1 million retail propane customers)					1,000,000
Percentage of contribution by contributor in form of limited partner interest								99.999%	99.99%
Percentage of contribution by contributor in form of membership interest								100.00%	100.00%
Percentage of remaining contribution by contributor in form of general partner interest								0.001%	0.01%
Contributed Common Units to the partnership				934,327
Fair value of Common Units contributed					41,680
Operating and administrative expenses						5,252
Cash consideration for acquisition of retail propane distribution business	15,746	19,946	1,425,002							15,746	19,946	13,518
Liabilities incurred										$ 4,491	$ 3,969	$ 4,844