OTHER INCOME AND (INCOME DEDUCTIONS) - NET (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Other Nonoperating Income (Expense) [Abstract]
Interest income	$ 240	$ 304	$ 631	$ 641
Net investment (loss) gain	832	1,173	771	2,214
Other income	5	11	73	11
Other income deductions	(89)	(110)	601	451
Other Income and (Income Deductions) - Net	$ 988	$ 1,378	$ 2,076	$ 3,317