Employee Benefit Plans (Schedule Of Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 353	$ 393	$ 705	$ 785
Expected return on plan assets	(387)	(374)	(775)	(747)
Amortization of net gain (loss)	190	140	380	281
Net periodic benefit cost	156	159	310	319
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	16	15	32	30
Interest cost	8	9	17	19
Amortization of net gain (loss)		(4)		(8)
Net periodic benefit cost	$ 24	$ 20	$ 49	$ 41