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Utility Regulatory Assets and Liabilities and Regulatory Matters (Details) - USD ($) $ in Millions |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2016 | Apr. 01, 2016 | Jan. 19, 2016 | Apr. 01, 2015 | Mar. 31, 2016 | Mar. 31, 2016 | Jun. 30, 2016 | Sep. 30, 2014 | Sep. 30, 2015 | Jun. 30, 2015
UGI Utilities |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |
Capitalized project costs |  |  |  |  | $ 5.8 | $ 5.8 |  |  |  |
Project costs expensed in prior periods |  |  |  |  |  | 5.4 |  |  |  |
UGI Utilities | Pennsylvania Public Utility Commission |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |
Requested operating revenue increase |  |  | $ 58.6 |  |  |  |  |  |  |
Operating revenue increase | $ 27.0 |  |  |  |  |  |  |  |  |
Maximum period since petition to file a general rate filing |  |  |  |  |  |  | 5 years |  |  |
DSIC, percent of amount billed to customers |  |  |  |  |  |  |  | 0.00% |  |
UGI Utilities | Pennsylvania Public Utility Commission | Maximum |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |
DSIC, percent of amount billed to customers |  |  |  |  | 5.00% |  | 5.00% |  |  |
UGI Utilities | Pennsylvania Public Utility Commission | PNG |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |
DSIC, percent of amount billed to customers |  |  |  | 0.00% |  |  |  |  |  |
UGI Utilities | Pennsylvania Public Utility Commission | PNG | Maximum |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |
DSIC, percent of amount billed to customers |  |  |  |  | 10.00% |  |  |  |  |
UGI Utilities | Pennsylvania Public Utility Commission | CPG |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |
DSIC, percent of amount billed to customers |  | 0.00% |  |  |  |  |  |  |  |
UGI Utilities | Pennsylvania Public Utility Commission | CPG | Maximum |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |
DSIC, percent of amount billed to customers |  |  |  |  | 10.00% |  |  |  |  |
UGI Utilities | Information Technology |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |
Associated increase to utility property, plant and equipment |  |  |  |  | $ 2.7 | 2.7 |  |  |  |
Gas Utility |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |
Fair value of unrealized gains (losses) | $ 5.5 |  |  |  |  |  | $ 5.5 |  | $ (3.3) | $ (0.7)
Electric Utility Electric Supply Contracts |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |
Fair value of unrealized gains (losses) |  |  |  |  |  |  |  |  | $ (0.5) | $ (1.4)
Deferred Project Costs | UGI Utilities |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |
Associated increases to utility regulatory assets |  |  |  |  | $ 3.1 | $ 3.1 |  |  |  |

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