CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($)	Jun. 30, 2017	Sep. 30, 2016
ASSETS
Property, plant and equipment	$ 10,952,422,000	$ 10,142,506,000
Less accumulated depreciation and amortization	2,028,041,000	1,873,900,000
Net property, plant and equipment	8,924,381,000	8,268,606,000
Current assets
Cash and cash equivalents	69,777,000	47,534,000
Accounts receivable, net	250,224,000	215,880,000
Gas stored underground	151,656,000	179,070,000
Current assets held for sale	0	151,117,000
Other current assets	62,725,000	88,085,000
Total current assets	534,382,000	681,686,000
Goodwill	729,673,000	726,962,000
Noncurrent assets held for sale	0	28,616,000
Deferred charges and other assets	310,339,000	305,019,000
Total assets	10,498,775,000	10,010,889,000
Shareholders' equity
Common stock, no par value (stated at $.005 per share)	530,000	520,000
Additional paid-in capital	2,525,752,000	2,388,027,000
Accumulated other comprehensive income (loss)	(104,599,000)	(188,022,000)
Retained earnings	1,480,027,000	1,262,534,000
Shareholders' equity	3,901,710,000	3,463,059,000
Long-term debt	3,066,734,000	2,188,779,000
Total capitalization	6,968,444,000	5,651,838,000
Current liabilities
Accounts payable and accrued liabilities	164,365,000	196,485,000
Current liabilities held for sale	0	72,900,000
Other current liabilities	322,721,000	439,085,000
Short-term debt	258,573,000	829,811,000
Current maturities of long-term debt	0	250,000,000
Total current liabilities	745,659,000	1,788,281,000
Deferred income taxes	1,853,564,000	1,603,056,000
Regulatory cost of removal obligation	457,060,000	424,281,000
Pension and postretirement liabilities	304,919,000	297,743,000
Noncurrent liabilities held for sale	0	316,000
Deferred credits and other liabilities	169,129,000	245,374,000
Total shareholders' equity and liabilities	$ 10,498,775,000	$ 10,010,889,000