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Utility Regulatory Assets and Liabilities and Regulatory Matters (Details) - USD ($) $ in Millions							1 Months Ended	3 Months Ended	12 Months Ended
	Oct. 19, 2016	Oct. 14, 2016	Jun. 30, 2016	Apr. 01, 2016	Jan. 19, 2016	Apr. 01, 2015	Mar. 31, 2016	Mar. 31, 2016	Sep. 30, 2016	Sep. 30, 2014	Sep. 30, 2015
Regulatory Assets and Liabilities
Associated increase to utility property, plant and equipment									$ 5,346.4		$ 5,075.6
UGI Utilities
Regulatory Assets and Liabilities
Capitalized project costs							$ 5.8	$ 5.8
Project costs expensed in prior periods								5.4
UGI Utilities | Pennsylvania Public Utility Commission
Regulatory Assets and Liabilities
Requested operating revenue increase					$ 58.6
Amount of 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 | PNG
Regulatory Assets and Liabilities
DSIC, percent of amount billed to customers						0.00%
UGI Utilities | Pennsylvania Public Utility Commission | CPG
Regulatory Assets and Liabilities
DSIC, percent of amount billed to customers				0.00%
UGI Utilities | Information Technology
Regulatory Assets and Liabilities
Associated increase to utility property, plant and equipment							$ 2.7	2.7
Subsequent Event | UGI Utilities | Pennsylvania Public Utility Commission
Regulatory Assets and Liabilities
Approved operating revenue increase		$ 27.0
Minimum
Regulatory Assets and Liabilities
Average remaining depreciable lives of the associated property									1 year
Maximum
Regulatory Assets and Liabilities
Average remaining depreciable lives of the associated property									65 years
Maximum | UGI Utilities | Pennsylvania Public Utility Commission
Regulatory Assets and Liabilities
DSIC, percent of amount billed to customers							5.00%		5.00%
Maximum | UGI Utilities | Pennsylvania Public Utility Commission | PNG
Regulatory Assets and Liabilities
DSIC, percent of amount billed to customers							10.00%
Maximum | UGI Utilities | Pennsylvania Public Utility Commission | CPG
Regulatory Assets and Liabilities
DSIC, percent of amount billed to customers							10.00%
Maximum | Postretirement Benefit Overcollections | Subsequent Event
Regulatory Assets and Liabilities
Regulatory liability, period overcollections will be refunded to customers	10 years
Removal Costs, Net | Maximum
Regulatory Assets and Liabilities
Regulatory asset, amortization period									5 years
Gas Utility
Regulatory Assets and Liabilities
Fair value of unrealized gains (losses)									$ 4.3		$ (3.3)
Other Regulatory Assets | Minimum
Regulatory Assets and Liabilities
Regulatory asset, amortization period									1 year
Other Regulatory Assets | Maximum
Regulatory Assets and Liabilities
Regulatory asset, amortization period									20 years
Deferred Project Costs | UGI Utilities
Regulatory Assets and Liabilities
Associated increase to utility regulatory assets							$ 3.1	$ 3.1

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