Nature of Operations (Details)	3 Months Ended
	Dec. 31, 2017 employee state
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of states in which the company has market share | state	50
General Partners Interest
Number of employees of the AmeriGas Partners and the Operating Partnership | employee	0
AmeriGas Propane Inc Partnership Interest in AmeriGas Partners
General Partners Interest
General partners ownership interest (as a percent)	1.00%
AmeriGas OLP
General Partners Interest
General partners ownership interest (as a percent)	1.01%
Limited partner interest held by AmeriGas Partners in AmeriGas OLP (as a percent)	98.99%