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Derivative Instruments and Hedging Activities - Narrative (Details) - USD ($) | Jun. 30, 2019 | Nov. 30, 2018 | Oct. 25, 2018 | Oct. 18, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Sep. 30, 2017
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Derivative [Line Items] |  |  |  |  |  |  |
Amount of net losses associated with interest rate hedges to be reclassified with interest rate hedges during the next 12 months | $ 3,500,000 |  |  |  |  |  |
Amount of net gains associated with currency rate risk to be reclassified into earnings during the next 12 months | 0 |  |  |  |  |  |
Restricted cash | 42,300,000 |  |  |  | $ 9,600,000 | $ 7,700,000 | $ 10,300,000
Interest Rate Protection Agreements |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Notional amount | $ 0 |  |  |  | $ 0 | $ 0 |
UGI International LLC | 3.25% Senior Unsecured Notes Due November 2025 | Senior Notes |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Stated interest rate |  |  | 3.25% |  |  |  |
UGI International LLC | EURIBOR | UGI International Credit Agreement | Revolving Credit Facility | Line of Credit |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, fixed interest rate |  | 0.34% |  | 0.34% |  |  |
Maximum | UGI Utilities | Unsecured Debt |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, fixed interest rate | 3.00% |  |  |  |  |  |

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