STATEMENTS OF INCOME (UNAUDITED) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Operating Revenues:
Utility	$ 363,912	$ 298,623	$ 614,703	$ 549,525
Other	233	274	1,376	1,355
Total Operating Revenues	364,145	298,897	616,079	550,880
Utility
Natural and propane gas	238,148	180,221	382,482	326,972
Other operation expenses	35,269	38,043	69,191	75,608
Maintenance	5,924	5,761	11,655	11,069
Depreciation and amortization	11,258	10,175	22,223	20,264
Taxes, other than income taxes	21,751	20,093	36,557	34,760
Total Utility Operating Expenses	312,350	254,293	522,108	468,673
Other	1,104	51	1,228	132
Total Operating Expenses	313,454	254,344	523,336	468,805
Operating Income	50,691	44,553	92,743	82,075
Other Income and (Income Deductions) - Net	988	1,378	2,076	3,317
Interest Charges:
Interest on long-term debt	5,483	5,740	10,884	11,479
Other interest charges	515	596	1,039	1,215
Total Interest Charges	5,998	6,336	11,923	12,694
Income Before Income Taxes	45,681	39,595	82,896	72,698
Income Tax Expense	15,906	13,670	27,379	25,076
Net Income	$ 29,775	$ 25,925	$ 55,517	$ 47,622