Partnership Distributions and Common Unit Offering (Details) (USD $)	12 Months Ended			1 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Mar. 31, 2012 AmeriGas Partners [Member]	Sep. 30, 2013 Senior Notes [Member]	Mar. 31, 2012 Senior Notes [Member] 6.50% Pursuant o Tender Offer [Member] AmeriGas Partners [Member]
Distributions Made to Member or Limited Partner [Line Items]
Policy for distribution to partner	45 days after the end of each fiscal quarter in a total amount equal to its Available Cash (as defined in the Partnership Agreement) for such quarter
Approximate distributions day range to partners (in days)	45 days
Pre-Incentive distribution of the available cash to Limited Partners	98.00%
Pre-Incentive distribution of available cash to General Partners	2.00%
General Partner Interest in AmeriGas partners	1.00%
General Partner Interest in AmeriGas OLP	1.01%
Minimum quarterly distribution	$ 0.55
First target distribution	$ 0.055
Incentive distribution policy	When Available Cash exceeds $0.605 per Common Unit in any quarter, the General Partner will receive a greater percentage of the total Partnership distribution (the “incentive distribution”) but only with respect to the amount by which the distribution per Common Unit to limited partners exceeds $0.605
Minimum available cash for per common unit	$ 0.605
General Partners distribution based on ownership interest	$ 27,400,000	$ 19,700,000	$ 9,000,000
Incentive distributions received by the General partner	19,300,000	13,000,000	5,000,000
Units sold in public offering				7,000,000
Underwriteen public offering price per unit				41.25
Issuances of AmeriGas Partners Common Units	0	276,600,000	0	276,600,000
General partners' contributed capital				2,800,000
Aggregate principal amount						$ 200,000,000
Interest rate stated percentage					7.125%	6.50%