CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($)	Dec. 31, 2016	Sep. 30, 2016
ASSETS
Property, plant and equipment	$ 10,492,625,000	$ 10,142,506,000
Less accumulated depreciation and amortization	1,939,663,000	1,873,900,000
Net property, plant and equipment	8,552,962,000	8,268,606,000
Current assets
Cash and cash equivalents	44,624,000	47,534,000
Accounts receivable, net	458,813,000	215,880,000
Gas stored underground	163,763,000	179,070,000
Current assets held for sale	235,482,000	151,117,000
Other current assets	76,750,000	88,085,000
Total current assets	979,432,000	681,686,000
Goodwill	729,673,000	726,962,000
Noncurrent assets held for sale	0	28,616,000
Deferred charges and other assets	317,088,000	305,019,000
Total assets	10,579,155,000	10,010,889,000
Shareholders' equity
Common stock, no par value (stated at $.005 per share)	526,000	520,000
Additional paid-in capital	2,451,277,000	2,388,027,000
Accumulated other comprehensive income (loss)	(92,654,000)	(188,022,000)
Retained earnings	1,339,826,000	1,262,534,000
Shareholders' equity	3,698,975,000	3,463,059,000
Long-term debt	2,314,199,000	2,188,779,000
Total capitalization	6,013,174,000	5,651,838,000
Current liabilities
Accounts payable and accrued liabilities	268,647,000	196,485,000
Current liabilities held for sale	109,298,000	72,900,000
Other current liabilities	381,123,000	439,085,000
Short-term debt	940,747,000	829,811,000
Current maturities of long-term debt	250,000,000	250,000,000
Total current liabilities	1,949,815,000	1,788,281,000
Deferred income taxes	1,725,433,000	1,603,056,000
Regulatory cost of removal obligation	430,407,000	424,281,000
Pension and postretirement liabilities	301,715,000	297,743,000
Noncurrent liabilities held for sale	0	316,000
Deferred credits and other liabilities	158,611,000	245,374,000
Total shareholders' equity and liabilities	$ 10,579,155,000	$ 10,010,889,000