Debt (Details) (USD $)	12 Months Ended									1 Months Ended							12 Months Ended		1 Months Ended		0 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2014 HOLP Senior Secured Notes	Sep. 30, 2013 HOLP Senior Secured Notes	Sep. 30, 2014 Line of Credit AmeriGas OLP Credit Agreement	Jun. 30, 2014 Line of Credit AmeriGas OLP Credit Agreement	Sep. 30, 2013 Line of Credit AmeriGas OLP Predecessor Credit Agreement	Jun. 30, 2014 Letter of Credit AmeriGas OLP Credit Agreement	Jun. 30, 2014 Federal Funds Rate Line of Credit Credit Agreement	Jun. 30, 2014 Minimum Line of Credit AmeriGas OLP Credit Agreement	Jun. 30, 2014 Minimum Base Rate Line of Credit Credit Agreement	Jun. 30, 2014 Minimum Eurodollar Line of Credit Credit Agreement	Jun. 30, 2014 Maximum Line of Credit AmeriGas OLP Credit Agreement	Jun. 30, 2014 Maximum Base Rate Line of Credit Credit Agreement	Jun. 30, 2014 Maximum Eurodollar Line of Credit Credit Agreement	Sep. 30, 2014 Senior Notes	Sep. 30, 2012 Senior Notes	Jun. 30, 2012 Senior Notes 7.00%, due May 2022	Jan. 12, 2012 Senior Notes 7.00%, due May 2022	Jan. 12, 2012 Senior Notes 6.75%, due May 2020	Mar. 28, 2012 Senior Notes 6.50%, due May 2021	Mar. 28, 2012 Senior Notes 6.50%, due May 2021
Debt Instrument
Principal repayments of long-term debt due in 2015	$ 10,999,000
Principal repayments of long-term debt due in 2016	7,602,000
Principal repayments of long-term debt due in 2017	5,588,000
Principal repayments of long-term debt due in 2018	4,887,000
Principal repayments of long-term debt due in 2019	454,523,000
Principal amount of senior notes issued																				1,000,000,000	550,000,000
Stated percentage rate																				7.00%	6.75%		6.50%
Early redemption percentage of Senior Notes with equity offering																					35.00%	105.00%
Guaranteed debt																	1,500,000,000
Debt holders of certain amount																							383,455,000
Percentage of aggregate amount outstanding tendered																						82.00%
Long-term debt																							470,000,000
Maximum Amount of Notes Offered for Cash Purchase																							200,000,000
Amount Redeemed on Tendered Notes																							199,999,000
Percentage of Proration Factor in Tendered Notes																							52.30%
Repayments of Long-term Debt	12,272,000	30,531,000	256,992,000																19,156,000
Gain (loss) on extinguishments of debt	0	0	(13,349,000)															(13,349,000)
HOLP Senior Secured Notes				26,497,000	32,001,000
Debt Instrument, Unamortized Premium				3,134,000	3,729,000
Face interest rate, minimum				7.89%
Face interest rate, maximum				8.87%
Effective interest rate				6.75%
Maximum borrowing capacity under revolving credit facility							525,000,000		125,000,000
Spread on variable interest rate										0.50%		0.50%	1.50%		1.50%	2.50%
Facility fee											0.30%			0.45%
Short-term bank loans and notes payable	109,000,000	116,900,000				109,000,000		116,900,000
Interest rate at period end						2.16%		2.69%
Letters of credit issued and outstanding						64,705,000		53,705,000
Fixed charge coverage ratio																	1.75
Cash distributions in a total amount																	75,000,000
Amount of net assets	$ 3,200,000,000