Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012
ASSETS
Property, Plant and Equipment	$ 6,954,180	$ 6,615,813
Less - Accumulated Depreciation, Depletion and Amortization	2,007,535	1,876,010
Property, Plant and Equipment, Net, Total	4,946,645	4,739,803
Current Assets
Cash and Temporary Cash Investments	112,413	74,494
Hedging Collateral Deposits	750	364
Receivables - Net of Allowance for Uncollectible Accounts of $38,996 and $30,317, Respectively	203,099	115,818
Unbilled Utility Revenue	41,735	19,652
Gas Stored Underground	14,443	49,795
Materials and Supplies - at average cost	31,538	28,577
Other Current Assets	51,731	56,121
Deferred Income Taxes	34,241	10,755
Total Current Assets	489,950	355,576
Other Assets
Recoverable Future Taxes	150,721	150,941
Unamortized Debt Expense	17,698	13,409
Other Regulatory Assets	556,310	546,851
Deferred Charges	7,829	7,591
Other Investments	92,746	86,774
Goodwill	5,476	5,476
Fair Value of Derivative Financial Instruments	6,471	27,616
Other	843	1,105
Total Other Assets	838,094	839,763
Total Assets	6,274,689	5,935,142
Capitalization:
Common Stock, $1 Par Value Authorized - 200,000,000 Shares; Issued and Outstanding - 83,521,745 Shares and 83,330,140 Shares, Respectively	83,522	83,330
Paid in Capital	676,615	669,501
Earnings Reinvested in the Business	1,398,999	1,306,284
Accumulated Other Comprehensive Loss	(117,023)	(99,020)
Total Comprehensive Shareholders' Equity	2,042,113	1,960,095
Long-Term Debt, Net of Current Portion	1,649,000	1,149,000
Total Capitalization	3,691,113	3,109,095
Current and Accrued Liabilities
Notes Payable to Banks and Commercial Paper	0	171,000
Current Portion of Long-Term Debt	0	250,000
Accounts Payable	95,095	87,985
Amounts Payable to Customers	18,239	19,964
Dividends Payable	30,486	30,416
Interest Payable on Long-Term Debt	30,741	29,491
Customer Advances	145	24,055
Customer Security Deposits	17,138	17,942
Other Accruals and Current Liabilities	140,056	79,099
Fair Value of Derivative Financial Instruments	41,498	24,527
Total Current and Accrued Liabilities	373,398	734,479
Deferred Credits
Deferred Income Taxes	1,179,594	1,065,757
Taxes Refundable to Customers	65,066	66,392
Unamortized Investment Tax Credit	1,792	2,005
Cost of Removal Regulatory Liability	149,651	139,611
Other Regulatory Liabilities	31,904	21,014
Pension and Other Post-Retirement Liabilities	500,946	516,197
Asset Retirement Obligations	125,328	119,246
Other Deferred Credits	155,897	161,346
Total Deferred Credits	2,210,178	2,091,568
Commitments and Contingencies	0	0
Total Capitalization and Liabilities	$ 6,274,689	$ 5,935,142