Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Mar. 31, 2015 lb	Oct. 31, 2014 lawsuit	Mar. 31, 2014
Commitments and Contingencies
Class action lawsuits (more than 35)		35
Amount of propane in cylinders before reduction	17
Amount of propane in cylinders after reduction	15
PNG MGP
Commitments and Contingencies
Loss contingency, settlement agreement, terms	2 years
Environmental Matters | CPG MGP
Commitments and Contingencies
Environmental expenditures cap during calendar year	1.8
Environmental Matters | PNG MGP
Commitments and Contingencies
Environmental expenditures cap during calendar year	1.1
Environmental Matters | UGI Utilities
Commitments and Contingencies
Base year for determination of investigation and remediation cost (in years)	5 years
CPG and PNG COAs | UGI Utilities
Commitments and Contingencies
Accrual for environmental loss contingencies	9.6		$ 11.1