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Debt - Schedule of Short-term Debt (Footnotes) (Details) | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2019 EUR (€) | Aug. 13, 2019 USD ($) | Aug. 12, 2019 USD ($) | Jun. 27, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2018 EUR (€)
Energy Services Credit Agreement | Minimum |  |  |  |  |  |  |
Short-term Debt |  |  |  |  |  |  |
Basis spread on variable rate (percentage) | 0.75% |  |  |  |  |  |
Energy Services Credit Agreement | Maximum |  |  |  |  |  |  |
Short-term Debt |  |  |  |  |  |  |
Basis spread on variable rate (percentage) | 2.25% |  |  |  |  |  |
Energy Services Credit Agreement | Federal Funds Effective Swap Rate |  |  |  |  |  |  |
Short-term Debt |  |  |  |  |  |  |
Basis spread on variable rate (percentage) | 0.50% |  |  |  |  |  |
Energy Services Credit Agreement | LIBOR |  |  |  |  |  |  |
Short-term Debt |  |  |  |  |  |  |
Basis spread on variable rate (percentage) | 1.00% |  |  |  |  |  |
UGI International LLC |  |  |  |  |  |  |
Short-term Debt |  |  |  |  |  |  |
Borrowing | $ 210,000,000.0 | € 192,700,000 |  |  |  |  | € 0
Total capacity | € |  | € 300,000,000.0 |  |  |  |  | € 300,000,000.0
UGI Utilities |  |  |  |  |  |  |
Short-term Debt |  |  |  |  |  |  |
Borrowing | 166,000,000.0 |  |  |  |  | $ 189,500,000 |
Total capacity | $ 350,000,000.0 |  |  |  |  | 450,000,000.0 |
UGI Utilities | 2019 Credit Agreement | Line of Credit |  |  |  |  |  |  |
Short-term Debt |  |  |  |  |  |  |
Total capacity |  |  |  |  | $ 350,000,000 |  |
UGI Utilities | 2019 Credit Agreement | Minimum | Line of Credit |  |  |  |  |  |  |
Short-term Debt |  |  |  |  |  |  |
Basis spread on variable rate (percentage) | 0.00% |  |  |  |  |  |
UGI Utilities | 2019 Credit Agreement | Maximum | Line of Credit |  |  |  |  |  |  |
Short-term Debt |  |  |  |  |  |  |
Basis spread on variable rate (percentage) | 1.75% |  |  |  |  |  |
UGI Utilities | Letter of Credit | 2019 Credit Agreement | Line of Credit |  |  |  |  |  |  |
Short-term Debt |  |  |  |  |  |  |
Total capacity | $ 50,000,000 |  |  |  | $ 100,000,000 |  |
Energy Services |  |  |  |  |  |  |
Short-term Debt |  |  |  |  |  |  |
Borrowing | 45,000,000.0 |  |  |  |  | 0 |
Total capacity | $ 200,000,000.0 |  | $ 200,000,000 | $ 240,000,000 |  | $ 240,000,000.0 |

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