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Commitments and Contingencies (Details) | 5 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 USD ($) lb | Sep. 30, 2015 USD ($) lawsuit | Sep. 30, 2014 USD ($) | Sep. 30, 2013 USD ($)
Commitments and Contingencies |  |  |  |
Aggregate rental expense for leases |  | $ 86,100,000 | $ 79,700,000 | $ 82,500,000
Accrued liabilities for environmental investigation and remediation costs related to CPG-COA and PNG-COA | $ 13,800,000 | $ 13,800,000 | $ 10,700,000 |
Class action lawsuits (more than 35) | 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 |  |  |  |
Commitments and Contingencies |  |  |  |
Base year for determination of investigation and remediation cost (in years) |  | 5 years |  |
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 |  |

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