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Utility Regulatory Assets and Liabilities and Regulatory Matters - Narrative (Details) - USD ($) $ in Millions |  |  |  |  |  |  |  |  | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 11, 2019 | Jan. 28, 2019 | Oct. 27, 2018 | Oct. 25, 2018 | May 17, 2018 | Jan. 26, 2018 | Jun. 30, 2017 | Oct. 19, 2016 | Jun. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Regulatory asset, amortization period |  |  | 20 years |  |  |  |  |  |  |  |
UGI South |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
PUC temporary rates order, percent of reduction in base rate revenues |  |  |  |  | 4.71% |  |  |  |  |  |
UGI North |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
PUC temporary rates order, percent of reduction in base rate revenues |  |  |  |  | 2.87% |  |  |  |  |  |
UGI Central |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
PUC temporary rates order, percent of reduction in base rate revenues |  |  |  |  | 6.34% |  |  |  |  |  |
Pennsylvania Public Utility Commission | UGI Gas |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Requested operating revenue increase |  | $ 71.1 |  |  |  |  |  |  |  |  |
Proposed negative surcharge |  | 4.50% |  |  |  |  |  |  |  |  |
Tax benefit to be returned |  |  |  |  |  |  |  |  | $ 24.0 |  |
Pennsylvania Public Utility Commission | Electric Utility |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Requested operating revenue increase |  |  |  | $ 3.2 |  | $ 7.7 |  |  |  |  |
Requested annual base distribution revenue increase |  |  |  |  |  | $ 9.2 |  |  |  |  |
Tax Cuts and Jobs Act Of 2017, customer billing credit |  |  | $ 0.2 |  |  |  |  |  |  |  |
Pennsylvania Public Utility Commission | PNG |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Base distribution rate increase |  |  |  |  |  |  | $ 11.3 |  |  |  |
Postretirement benefit overcollections |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Regulatory liability, amortization period |  |  |  |  |  |  |  | 10 years |  |  |
Gas Utility |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fair value of unrealized gains (losses) |  |  |  |  |  |  |  |  |  | $ (2.2) | $ 2.9
Minimum |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Average remaining depreciable lives of the associated property |  |  |  |  |  |  |  |  |  | 1 year |
Maximum |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Average remaining depreciable lives of the associated property |  |  |  |  |  |  |  |  |  | 65 years |
Maximum | Removal Costs, Net |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Regulatory asset, amortization period |  |  |  |  |  |  |  |  |  | 5 years |
Subsequent Event | Pennsylvania Public Utility Commission | UGI Gas |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Energy Efficiency and Conservation and Growth extension tariff, extension term | 5 years |  |  |  |  |  |  |  |  |  |
Base distribution rate increase | $ 30.0 |  |  |  |  |  |  |  |  |  |

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