Condensed Consolidated Statements of Partners' Capital (unaudited) - USD ($)	Total	Total AmeriGas Partners, L.P. partners’ capital	Common units	General partner	Noncontrolling interest
Beginning Balance (in units) at Sep. 30, 2016			92,923,410
Beginning Balance at Sep. 30, 2016	$ 1,019,209,000	$ 984,221,000	$ 967,073,000	$ 17,148,000	$ 34,988,000
Increase (Decrease) in Partners' Capital
Net income including noncontrolling interest	93,615,000	91,954,000	80,602,000	11,352,000	1,661,000
Distributions	(100,501,000)	(99,091,000)	(87,351,000)	(11,740,000)	(1,410,000)
Unit-based compensation expense	239,000	239,000	$ 239,000
General Partner contribution to AmeriGas Propane, L.P.	1,602,000				1,602,000
Common Units issued in connection with employee and director plans, net of tax withheld (in units)			3,510
Common Units issued in connection with employee and director plans, net of tax withheld	(53,000)	(53,000)	$ (53,000)
Ending Balance (in units) at Dec. 31, 2016			92,926,920
Ending Balance at Dec. 31, 2016	1,014,111,000	977,270,000	$ 960,510,000	16,760,000	36,841,000
Beginning Balance (in units) at Sep. 30, 2017			92,958,586
Beginning Balance at Sep. 30, 2017	783,071,000	747,899,000	$ 733,104,000	14,795,000	35,172,000
Increase (Decrease) in Partners' Capital
Net income including noncontrolling interest	105,870,000	104,421,000	92,049,000	12,372,000	1,449,000
Distributions	(102,221,000)	(100,650,000)	(88,315,000)	(12,335,000)	(1,571,000)
Unit-based compensation expense	190,000	190,000	$ 190,000
General Partner contribution to AmeriGas Propane, L.P.	0
Common Units issued in connection with employee and director plans, net of tax withheld (in units)			4,754
Common Units issued in connection with employee and director plans, net of tax withheld	(62,000)	(62,000)	$ (62,000)
Ending Balance (in units) at Dec. 31, 2017			92,963,340
Ending Balance at Dec. 31, 2017	$ 786,848,000	$ 751,798,000	$ 736,966,000	$ 14,832,000	$ 35,050,000