CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Dec. 31, 2015	Sep. 30, 2015
ASSETS
Property, plant and equipment	$ 9,502,944	$ 9,240,100
Less accumulated depreciation and amortization	1,849,657	1,809,520
Net property, plant and equipment	7,653,287	7,430,580
Current assets
Cash and cash equivalents	78,903	28,653
Accounts receivable, net	456,904	295,160
Gas stored underground	236,017	236,603
Other current assets	91,446	70,569
Total current assets	863,270	630,985
Goodwill	742,702	742,702
Deferred charges and other assets	295,394	288,678
Total assets	9,554,653	9,092,945
Shareholders' equity
Common stock, no par value (stated at $.005 per share)	510	507
Additional paid-in capital	2,242,307	2,230,591
Accumulated other comprehensive income (loss)	(102,962)	(109,330)
Retained earnings	1,132,254	1,073,029
Shareholders' equity	3,272,109	3,194,797
Long-term debt	2,455,474	2,455,388
Total capitalization	5,727,583	5,650,185
Current liabilities
Accounts payable and accrued liabilities	280,487	238,942
Other current liabilities	471,333	457,954
Short-term debt	763,236	457,927
Total current liabilities	1,515,056	1,154,823
Deferred income taxes	1,441,325	1,411,315
Regulatory cost of removal obligation	425,555	427,553
Pension and postretirement liabilities	289,939	287,373
Deferred credits and other liabilities	155,195	161,696
Total shareholders' equity and liabilities	$ 9,554,653	$ 9,092,945