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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 |  |

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