CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Mar. 31, 2016	Sep. 30, 2015
ASSETS
Property, plant and equipment	$ 9,722,228	$ 9,240,100
Less accumulated depreciation and amortization	1,882,815	1,809,520
Net property, plant and equipment	7,839,413	7,430,580
Current assets
Cash and cash equivalents	47,918	28,653
Accounts receivable, net	361,582	295,160
Gas stored underground	190,961	236,603
Other current assets	52,451	65,890
Total current assets	652,912	626,306
Goodwill	742,702	742,702
Deferred charges and other assets	308,899	293,357
Total assets	9,543,926	9,092,945
Shareholders' equity
Common stock, no par value (stated at $.005 per share)	511	507
Additional paid-in capital	2,255,875	2,230,591
Accumulated other comprehensive income (loss)	(157,239)	(109,330)
Retained earnings	1,245,418	1,073,029
Shareholders' equity	3,344,565	3,194,797
Long-term debt	2,455,559	2,455,388
Total capitalization	5,800,124	5,650,185
Current liabilities
Accounts payable and accrued liabilities	226,641	238,942
Other current liabilities	373,783	457,954
Short-term debt	626,929	457,927
Total current liabilities	1,227,353	1,154,823
Deferred income taxes	1,557,790	1,411,315
Regulatory cost of removal obligation	426,756	427,553
Pension and postretirement liabilities	294,377	287,373
Deferred credits and other liabilities	237,526	161,696
Total shareholders' equity and liabilities	$ 9,543,926	$ 9,092,945