CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)	Jun. 30, 2019	Sep. 30, 2018
ASSETS
Property, plant and equipment	$ 13,687,833,000	$ 12,567,373,000
Less accumulated depreciation and amortization	2,347,237,000	2,196,226,000
Net property, plant and equipment	11,340,596,000	10,371,147,000
Current assets
Cash and cash equivalents	46,163,000	13,771,000
Accounts receivable, net	285,433,000	253,295,000
Gas stored underground	106,014,000	165,732,000
Other current assets	65,924,000	46,055,000
Total current assets	503,534,000	478,853,000
Goodwill	730,419,000	730,419,000
Deferred charges and other assets	306,549,000	294,018,000
Total assets	12,881,098,000	11,874,437,000
Shareholders’ equity
Common stock, no par value (stated at $0.005 per share)	591,000	556,000
Additional paid-in capital	3,599,724,000	2,974,926,000
Accumulated other comprehensive loss	(115,663,000)	(83,647,000)
Retained earnings	2,157,344,000	1,878,116,000
Shareholders’ equity	5,641,996,000	4,769,951,000
Long-term debt	3,529,135,000	2,493,665,000
Total capitalization	9,171,131,000	7,263,616,000
Current liabilities
Accounts payable and accrued liabilities	206,500,000	217,283,000
Other current liabilities	494,932,000	547,068,000
Short-term debt	74,942,000	575,780,000
Current maturities of long-term debt	125,000,000	575,000,000
Total current liabilities	901,374,000	1,915,131,000
Deferred income taxes	1,280,307,000	1,154,067,000
Regulatory excess deferred taxes (See Note 13)	709,974,000	739,670,000
Regulatory Cost of Removal Liability, Noncurrent	464,855,000	466,405,000
Pension and postretirement liabilities	177,602,000	177,520,000
Deferred credits and other liabilities	175,855,000	158,028,000
Total shareholders' equity and liabilities	$ 12,881,098,000	$ 11,874,437,000