Commitments and Contingencies (Details) $ in Millions	1 Months Ended		6 Months Ended
	Sep. 30, 2016 USD ($)	Jan. 31, 2015 USD ($)	Mar. 31, 2017 USD ($) subsidiary lb	Oct. 31, 2014 lawsuit	Mar. 31, 2016 USD ($)
Loss Contingencies
Amount awarded		$ 18.0
Adjustment to litigation accrual	$ 15.0
Class action lawsuits (more than) | 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 Gas | Environmental Matters
Loss Contingencies
Environmental expenditures cap during calendar year			$ 2.5
CPG MGP | Environmental Matters
Loss Contingencies
Environmental expenditures cap during calendar year			1.8
PNG MGP | Environmental Matters
Loss Contingencies
Environmental expenditures cap during calendar year			$ 1.1
PNG-COA
Loss Contingencies
Loss contingency, settlement agreement, terms			2 years
UGI Utilities | CPG, PNG and UGI Gas COAs
Loss Contingencies
Accrual for environmental loss contingencies	$ 55.1		$ 55.7		$ 55.5
UGI Utilities | PNG and CPG
Loss Contingencies
Number of subsidiaries acquired with similar histories | subsidiary			2