Regulatory Assets and Liabilities and Regulatory Matters - Schedule of Regulatory Assets and Liabilities Associated With Gas Utility and Electric Utility (Details) - USD ($) $ in Thousands		Jun. 30, 2016	Sep. 30, 2015	Jun. 30, 2015
Regulatory Assets and Liabilities
Regulatory Assets		$ 345,300	$ 304,208	$ 254,242
Regulatory Liabilities	[1]	69,856	71,004	77,522
Postretirement benefits
Regulatory Assets and Liabilities
Regulatory Liabilities		19,671	19,975	19,687
Deferred fuel and power refunds
Regulatory Assets and Liabilities
Regulatory Liabilities		34,432	36,638	45,564
State tax benefits — distribution system repairs
Regulatory Assets and Liabilities
Regulatory Liabilities		14,604	13,266	10,894
Other
Regulatory Assets and Liabilities
Regulatory Liabilities		1,149	1,125	1,377
Income taxes recoverable
Regulatory Assets and Liabilities
Regulatory Assets		119,604	115,946	111,807
Underfunded pension and postretirement plans
Regulatory Assets and Liabilities
Regulatory Assets		133,356	140,762	103,250
Environmental costs
Regulatory Assets and Liabilities
Regulatory Assets	[2]	60,716	19,983	14,441
Removal costs, net
Regulatory Assets and Liabilities
Regulatory Assets		22,444	21,223	19,635
Other
Regulatory Assets and Liabilities
Regulatory Assets		$ 9,180	$ 6,294	$ 5,109

[1] Regulatory liabilities, other than deferred fuel and power refunds, are recorded in other current and other noncurrent liabilities in the Condensed Consolidated Balance Sheets.

[2] Environmental costs at June 30, 2016, include amounts probable of recovery recorded in conjunction with UGI Gas’ Consent Order and Agreement with the Pennsylvania Department of Environmental Protection (see Note 7).