STATEMENTS OF CONSOLIDATED CASH FLOWS (UNAUDITED) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Operating Activities:
Net Income	$ 62,394	$ 63,291
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation, amortization, and accretion	34,721	30,900
Deferred income taxes and investment tax credits	13,208	22,448
Other - net	1,753	(425)
Changes in assets and liabilities:
Accounts receivable - net	1,685	(2,699)
Unamortized purchased gas adjustments	34,444	16,561
Deferred purchased gas costs	12,160	(25,429)
Accounts payable	21,717	(15,025)
Delayed customer billings - net	(36,465)	(9,005)
Taxes accrued	16,562	568
Natural gas stored underground	33,558	59,978
Other assets and liabilities	(28,693)	(12,964)
Net cash provided by (used in) operating activities	167,044	128,199
Investing Activities:
Capital expenditures	(96,816)	(76,780)
Other investments	(2,558)	(1,388)
Net cash used in investing activities	(99,374)	(78,168)
Financing Activities:
Issuance of long-term debt	125,000	0
Maturity of first mortgage bonds	(25,000)	0
Repayment of short-term debt - net	(40,100)	(46,000)
Non-employee directors' restricted stock awards	0	(565)
Changes in book overdrafts	(1,139)	223
Issuance of common stock	431,329	3,162
Dividends paid	(28,651)	(27,599)
Employees' taxes paid associated with restricted shares withheld upon vesting	(736)	(1,171)
Excess tax benefits from stock-based compensation	1,135	208
Other	(476)	(43)
Net cash provided by financing activities	461,362	(71,785)
Net Increase (Decrease) in Cash and Cash Equivalents	529,032	(21,754)
Cash and Cash Equivalents at Beginning of Period	27,457	43,277
Cash and Cash Equivalents at End of Period	556,489	21,523
Supplemental Disclosure of Cash Paid (Refunded) During the Period for:
Interest	22,666	21,811
Income taxes	$ (2,844)	$ 7,064