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Nature of Operations (Details) $ in Millions | 6 Months Ended
--- | ---
Mar. 31, 2018 USD ($) county | Mar. 31, 2017 USD ($)
Investment [Line Items] |  |
General Partner incentive distribution | $ | $ 22.7 | $ 20.9
Number of counties of operation | county | 1 |
Amerigas Propane | AmeriGas Partners |  |
Investment [Line Items] |  |
General Partner held a general partner interest in AmeriGas Partners | 1.00% |
Percentage of limited partnership interest in AmeriGas Partners | 25.30% |
General public as limited partner interests in AmeriGas Partners | 73.70% |
Amerigas Propane | AmeriGas OLP |  |
Investment [Line Items] |  |
Effective ownership interest in AmeriGas OLP | 27.00% |

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