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Debt - Schedule of Short-term Debt (Footnotes) (Details) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) | Sep. 30, 2018 EUR (€) | Sep. 30, 2017 EUR (€) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
AmeriGas Credit Agreement | Federal Funds Effective Swap Rate |  |  |  |  |
Short-term Debt |  |  |  |  |
Basis spread on variable rate (percentage) | 0.50% |  |  |  |
AmeriGas Credit Agreement | Base Rate | Minimum |  |  |  |  |
Short-term Debt |  |  |  |  |
Basis spread on variable rate (percentage) | 0.50% |  |  |  |
AmeriGas Credit Agreement | Base Rate | Maximum |  |  |  |  |
Short-term Debt |  |  |  |  |
Basis spread on variable rate (percentage) | 1.75% |  |  |  |
AmeriGas Credit Agreement | Eurodollar | Minimum |  |  |  |  |
Short-term Debt |  |  |  |  |
Basis spread on variable rate (percentage) | 1.50% |  |  |  |
AmeriGas Credit Agreement | Eurodollar | Maximum |  |  |  |  |
Short-term Debt |  |  |  |  |
Basis spread on variable rate (percentage) | 2.75% |  |  |  |
Letter of Credit | AmeriGas Credit Agreement | Line of Credit |  |  |  |  |
Short-term Debt |  |  |  |  |
Total capacity | $ 150,000,000 |  |  |  |
Revolving Credit Facility | AmeriGas Credit Agreement | Line of Credit |  |  |  |  |
Short-term Debt |  |  |  |  |
Total capacity | 600,000,000 |  |  |  |
AmeriGas OLP |  |  |  |  |
Short-term Debt |  |  |  |  |
Total capacity |  |  |  | $ 600,000,000 | $ 525,000,000
AmeriGas OLP | Letter of Credit | AmeriGas Credit Agreement |  |  |  |  |
Short-term Debt |  |  |  |  |
Total capacity | $ 125,000,000 |  |  | 150,000,000 |
AmeriGas OLP | Line of Credit | AmeriGas Credit Agreement | Minimum |  |  |  |  |
Short-term Debt |  |  |  |  |
Facility fee (percentage) |  | 0.30% |  |  |
AmeriGas OLP | Line of Credit | AmeriGas Credit Agreement | Maximum |  |  |  |  |
Short-term Debt |  |  |  |  |
Facility fee (percentage) |  | 0.50% |  |  |
AmeriGas OLP | Line of Credit | AmeriGas Credit Agreement | Federal Funds Effective Swap Rate |  |  |  |  |
Short-term Debt |  |  |  |  |
Basis spread on variable rate (percentage) |  | 0.50% |  |  |
AmeriGas OLP | Line of Credit | AmeriGas Credit Agreement | Base Rate | Minimum |  |  |  |  |
Short-term Debt |  |  |  |  |
Basis spread on variable rate (percentage) |  | 0.50% |  |  |
AmeriGas OLP | Line of Credit | AmeriGas Credit Agreement | Base Rate | Maximum |  |  |  |  |
Short-term Debt |  |  |  |  |
Basis spread on variable rate (percentage) |  | 1.75% |  |  |
AmeriGas OLP | Line of Credit | AmeriGas Credit Agreement | Eurodollar | Minimum |  |  |  |  |
Short-term Debt |  |  |  |  |
Basis spread on variable rate (percentage) |  | 1.50% |  |  |
AmeriGas OLP | Line of Credit | AmeriGas Credit Agreement | Eurodollar | Maximum |  |  |  |  |
Short-term Debt |  |  |  |  |
Basis spread on variable rate (percentage) |  | 2.75% |  |  |
France SAS |  |  |  |  |
Short-term Debt |  |  |  |  |
Total capacity | € |  | € 60,000,000 | € 60,000,000 |  |
France SAS | 2015 Senior Facilities Agreement | EURIBOR |  |  |  |  |
Short-term Debt |  |  |  |  |
Basis spread on variable rate (percentage) |  | 1.75% | 1.90% |  |
France SAS | 2015 Senior Facilities Agreement | EURIBOR | Minimum |  |  |  |  |
Short-term Debt |  |  |  |  |
Basis spread on variable rate (percentage) |  | 1.60% |  |  |
France SAS | 2015 Senior Facilities Agreement | EURIBOR | Maximum |  |  |  |  |
Short-term Debt |  |  |  |  |
Basis spread on variable rate (percentage) |  | 2.70% |  |  |
France SAS | Revolving Credit Facility | 2015 Senior Facilities Agreement | EURIBOR | Minimum |  |  |  |  |
Short-term Debt |  |  |  |  |
Basis spread on variable rate (percentage) |  | 1.45% |  |  |
France SAS | Revolving Credit Facility | 2015 Senior Facilities Agreement | EURIBOR | Maximum |  |  |  |  |
Short-term Debt |  |  |  |  |
Basis spread on variable rate (percentage) |  | 2.55% |  |  |
Flaga |  |  |  |  |
Short-term Debt |  |  |  |  |
Total capacity | € |  | € 55,000,000 | € 55,000,000 |  |
Flaga | Flaga Credit Facility Agreement | Overdraft Facility |  |  |  |  |
Short-term Debt |  |  |  |  |
Total capacity | € |  | 5,000,000 |  |  |
Flaga | Flaga Credit Facility Agreement | Guarantee Facility |  |  |  |  |
Short-term Debt |  |  |  |  |
Total capacity | € |  | 25,000,000 |  |  |
Flaga | Revolving Credit Facility | Flaga Credit Facility Agreement | Line of Credit |  |  |  |  |
Short-term Debt |  |  |  |  |
Total capacity | € |  | € 25,000,000 |  |  |
Facility fee (percentage) |  | 30.00% |  |  |
Flaga | Revolving Credit Facility | Flaga Credit Facility Agreement | EURIBOR | Minimum | Line of Credit |  |  |  |  |
Short-term Debt |  |  |  |  |
Basis spread on variable rate (percentage) |  | 1.45% |  |  |
Flaga | Revolving Credit Facility | Flaga Credit Facility Agreement | EURIBOR | Maximum | Line of Credit |  |  |  |  |
Short-term Debt |  |  |  |  |
Basis spread on variable rate (percentage) |  | 3.65% |  |  |
Energy Services |  |  |  |  |
Short-term Debt |  |  |  |  |
Total capacity |  |  |  | $ 240,000,000 | 240,000,000
Energy Services | Energy Services Credit Agreement |  |  |  |  |
Short-term Debt |  |  |  |  |
Maximum ratio of Total Indebtedness to EBITDA, after dividend payment |  | 3.00 |  | 3.00 |
Energy Services | Energy Services Credit Agreement | Minimum | Line of Credit |  |  |  |  |
Short-term Debt |  |  |  |  |
Basis spread on variable rate (percentage) |  | 0.75% |  |  |
Energy Services | Energy Services Credit Agreement | Maximum | Line of Credit |  |  |  |  |
Short-term Debt |  |  |  |  |
Basis spread on variable rate (percentage) |  | 2.25% |  |  |
Energy Services | Energy Services Credit Agreement | LIBOR | Line of Credit |  |  |  |  |
Short-term Debt |  |  |  |  |
Basis spread on variable rate (percentage) |  | 1.00% |  |  |
Energy Services | Energy Services Credit Agreement | Federal Funds Rate | Line of Credit |  |  |  |  |
Short-term Debt |  |  |  |  |
Basis spread on variable rate (percentage) |  | 0.50% |  |  |
Energy Services | Letter of Credit | Energy Services Credit Agreement | Line of Credit |  |  |  |  |
Short-term Debt |  |  |  |  |
Total capacity |  |  |  | $ 50,000,000 |
UGI Utilities |  |  |  |  |
Short-term Debt |  |  |  |  |
Total capacity |  |  |  | 450,000,000 | $ 300,000,000
UGI Utilities | Letter of Credit | 2015 UGI Utilities Credit Agreement |  |  |  |  |
Short-term Debt |  |  |  |  |
Total capacity |  |  |  | $ 100,000,000 |
UGI Utilities | Line of Credit | 2015 UGI Utilities Credit Agreement | LIBOR | Minimum |  |  |  |  |
Short-term Debt |  |  |  |  |
Basis spread on variable rate (percentage) |  | 0.00% |  |  |
UGI Utilities | Line of Credit | 2015 UGI Utilities Credit Agreement | LIBOR | Maximum |  |  |  |  |
Short-term Debt |  |  |  |  |
Basis spread on variable rate (percentage) |  | 1.75% |  |  |

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