Regulatory Assets and Liabilities and Regulatory Matters (Tables)

12 Months Ended

Sep. 30, 2013

Regulated Operations [Abstract]

Regulatory assets and liabilities associated with Gas Utility and Electric Utility

The following regulatory assets and liabilities associated with Utilities are included in our accompanying Consolidated Balance Sheets at September 30:

	2013		2012
Regulatory assets:
Income taxes recoverable	$	106,069	$	103,172
Underfunded pension and postretirement plans	94,515		188,222
Environmental costs	17,054		16,812
Deferred fuel and power costs	8,283		11,602
Removal costs, net	13,333		12,718
Other	5,657		5,879
Total regulatory assets	$	244,911	$	338,405
Regulatory liabilities:
Postretirement benefits	$	16,497	$	13,147
Environmental overcollections	2,552		2,883
Deferred fuel and power refunds	8,283		4,435
State tax benefits — distribution system repairs	8,453		7,385
Other	1,502		494
Total regulatory liabilities	$	37,287	$	28,344