Commitments and Contingencies (Details)	6 Months Ended
	Mar. 31, 2016 USD ($) subsidiary lb	Oct. 31, 2014 lawsuit	Mar. 31, 2015 USD ($)
Commitments and Contingencies
Class action lawsuits (more than 35) | lawsuit		35
Amount of propane in cylinders before reduction (in pounds) | lb	17
Amount of propane in cylinders after reduction (in pounds) | lb	15
UGI Utilities | Environmental Matters
Commitments and Contingencies
Base year for determination of investigation and remediation cost (in years)	5 years
UGI Utilities | CPG and PNG COAs
Commitments and Contingencies
Accrual for environmental loss contingencies	$ 11,800,000		$ 9,600,000
CPG MGP | Environmental Matters
Commitments and Contingencies
Environmental expenditures cap during calendar year	$ 1,800,000.0
PNG MGP
Commitments and Contingencies
Loss contingency, settlement agreement, terms	2 years
PNG MGP | Environmental Matters
Commitments and Contingencies
Environmental expenditures cap during calendar year	$ 1,100,000.0
UGI Gas MGP Properties | Environmental Matters
Commitments and Contingencies
Expected environmental expenditures cap during calendar year	2,500,000
UGI Gas-COA | UGI Utilities
Commitments and Contingencies
Accrual for environmental loss contingencies	$ 43,800,000
PNG and CPG | UGI Utilities
Commitments and Contingencies
Number of subsidiaries acquired with similar histories | subsidiary	2