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Utility Regulatory Assets and Liabilities and Regulatory Matters - Narrative (Details) - USD ($) $ in Millions |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 20, 2017 | Jul. 01, 2017 | Jan. 19, 2017 | Jan. 01, 2017 | Oct. 19, 2016 | Oct. 14, 2016 | Jun. 30, 2016 | Apr. 01, 2016 | Jan. 19, 2016 | Apr. 01, 2015 | Mar. 31, 2016 | Sep. 30, 2017 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2016
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Associated increase to utility property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  | $ 5,564.6 |  |  | $ 5,346.4
UGI Utilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalized project costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.8
Project costs expensed in prior periods |  |  |  |  |  |  |  |  |  |  |  |  | $ 5.4 |  |
UGI Utilities | Information Technology |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Associated increase to utility property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.7
Pennsylvania Public Utility Commission |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum period since petition to file a general rate filing |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |
DSIC, percent of amount billed to customers |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% |
Pennsylvania Public Utility Commission | PNG |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested operating revenue increase |  |  | $ 21.7 |  |  |  |  |  |  |  |  |  |  |  |
DSIC, percent of amount billed to customers |  | 7.50% |  |  |  |  |  |  |  | 0.00% |  |  |  |  |
Pennsylvania Public Utility Commission | PNG | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved operating revenue increase | $ 11.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pennsylvania Public Utility Commission | UGI Gas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved operating revenue increase |  |  |  |  |  | $ 27.0 |  |  |  |  |  |  |  |  |
Pennsylvania Public Utility Commission | CPG |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DSIC, percent of amount billed to customers |  | 7.50% |  |  |  |  |  | 0.00% |  |  |  |  |  |  |
Pennsylvania Public Utility Commission | UGI Utilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested operating revenue increase |  |  |  |  |  |  |  |  | $ 58.6 |  |  |  |  |  |
Amount of operating revenue increase |  |  |  |  |  |  | $ 27.0 |  |  |  |  |  |  |  |
Gas Utility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of unrealized gains (losses) |  |  |  |  |  |  |  |  |  |  |  | $ 0.1 |  |  | 4.3
Deferred Project Costs | UGI Utilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Associated increase to utility regulatory assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3.1
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 | Pennsylvania Public Utility Commission |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DSIC, percent of amount billed to customers |  |  |  | 5.00% |  |  |  |  |  |  | 5.00% |  |  |  |
Maximum | Pennsylvania Public Utility Commission | PNG |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DSIC, percent of amount billed to customers |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |
Maximum | Pennsylvania Public Utility Commission | CPG |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DSIC, percent of amount billed to customers |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |
Maximum | Postretirement benefit overcollections |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory liability, period overcollections will be refunded to customers |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |
Maximum | Removal Costs, Net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory asset, amortization period |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |

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