Commitments and Contingencies (Details) $ in Thousands	6 Months Ended
	Oct. 31, 2014 lawsuit lb	Dec. 31, 2017 USD ($)	Mar. 31, 2017 USD ($)
Loss Contingencies
Class action lawsuits (more than) | lawsuit	35
FTC Cylinder Investigation
Loss Contingencies
Amount of propane in cylinders before reduction (in pounds) | lb	17
Amount of propane in cylinders after reduction (in pounds) | lb	15
AmeriGas OLP | DEC Remediation Plan | Saranac Lake, New York
Loss Contingencies
Estimated remediation plan cost | $			$ 27,700
Liability accrued for potential remediation costs | $		$ 7,545