Financial Instruments (Schedule Of Derivatives And Hedged Items In Fair Value Hedging Relationships) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) on Derivative Recognized in the Consolidated Statement of Income	$ 122
Amount of Gain or (Loss) on Hedged Item Recognized in the Consolidated Statement of Income	(122)
Operating Revenues [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) on Derivative Recognized in the Consolidated Statement of Income	696
Amount of Gain or (Loss) on Hedged Item Recognized in the Consolidated Statement of Income	(696)
Purchased Gas [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) on Derivative Recognized in the Consolidated Statement of Income	(574)
Amount of Gain or (Loss) on Hedged Item Recognized in the Consolidated Statement of Income	$ 574