Consolidated Statements of Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Revenues	$ 884,333	$ 1,137,366	$ 1,169,539
Costs and expenses:
Cost of sales - gas, fuel and purchased power (excluding depreciation shown below)	459,079	678,500	730,502
Operating and administrative expenses	165,479	176,922	169,464
Operating and administrative expenses - related parties	9,326	12,125	14,209
Taxes other than income taxes	17,263	16,616	18,638
Depreciation	49,702	49,917	50,747
Amortization	3,090	2,629	2,729
Other income, net	(4,989)	(10,764)	(6,269)
Total costs and expenses	698,950	925,945	980,020
Operating income	185,383	211,421	189,519
Interest expense	42,412	42,728	42,336
Income before income taxes	142,971	168,693	147,183
Income taxes	55,073	63,497	56,925
Net income	$ 87,898	$ 105,196	$ 90,258