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Commitments and Contingencies - Narrative (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |  |
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Mar. 31, 2014 lb | Mar. 31, 2014 PNG MGP | Mar. 31, 2014 Environmental Matters CPG MGP | Mar. 31, 2014 Environmental Matters PNG MGP | Mar. 31, 2014 Environmental Matters UGI Utilities | Mar. 31, 2014 CPG and PNG COAs UGI Utilities | Mar. 31, 2013 CPG and PNG COAs UGI Utilities
Commitments and Contingencies |  |  |  |  |  |  |
Environmental expenditures cap during calendar year |  |  | $ 1.8 | $ 1.1 |  |  |
Loss Contingency, Settlement Agreement, Terms |  | P2Y |  |  |  |  |
Accrual for environmental loss contingencies |  |  |  |  |  | $ 11.1 | $ 14.3
Base year for determination of investigation and remediation cost (in years) |  |  |  |  | 5 years |  |
Amount of propane in cylinders before reduction | 17 |  |  |  |  |  |
Amount of propane in cylinders after reduction | 15 |  |  |  |  |  |

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