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Commitments and Contingencies (Details)	1 Months Ended		6 Months Ended	12 Months Ended
Commitments and Contingencies (Details)	Sep. 30, 2016 USD ($)	Jan. 31, 2015 USD ($)	Oct. 31, 2014 lawsuit	Sep. 30, 2016 USD ($) lb	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2016 subsidiary
Commitments and Contingencies
Aggregate rental expense for leases				$ 102,000,000	$ 86,100,000	$ 79,700,000
Accrued liabilities for environmental investigation and remediation costs related to CPG-COA and PNG-COA	$ 11,300,000			$ 11,300,000	$ 13,800,000
Amount awarded		$ 18,000,000
Adjustment to litigation accrual	15,000,000
Class action lawsuits (more than) \| lawsuit			35
Amount of propane in cylinders being sold \| lb				17
Reduced amount of propane in cylinders being sold \| lb				15
PNG MGP
Commitments and Contingencies
Loss contingency, settlement agreement, terms				2 years
Environmental Issue \| UGI Gas MGP Properties
Commitments and Contingencies
Expected environmental expenditures cap during calendar year				$ 2,500,000.0
Environmental Issue \| CPG MGP
Commitments and Contingencies
Environmental expenditures cap during calendar year				1,800,000
Environmental Issue \| PNG MGP
Commitments and Contingencies
Environmental expenditures cap during calendar year				$ 1,100,000
Maximum \| Gas Utility
Commitments and Contingencies
Term of contracts				16 months
Maximum \| Midstream and Marketing
Commitments and Contingencies
Term of contracts				2 years
Maximum \| Partnership
Commitments and Contingencies
Term of contracts				3 years
Maximum \| UGI International
Commitments and Contingencies
Term of contracts				3 years
The Partnership and UGI International \| Minimum
Commitments and Contingencies
Contract terms subject to annual price and quantity adjustments (in years)				1 year
The Partnership and UGI International \| Maximum
Commitments and Contingencies
Contract terms subject to annual price and quantity adjustments (in years)				3 years
UGI Utilities \| UGI Gas-COA
Commitments and Contingencies
Accrued liabilities for environmental investigation and remediation costs related to CPG-COA and PNG-COA	$ 43,700,000			$ 43,700,000
UGI Utilities \| PNG and CPG
Commitments and Contingencies
Number of subsidiaries acquired with similar histories \| subsidiary							2