Employee Benefit Plans (Schedule Of Amounts Recognized In Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Pension Benefits [Member]
Net loss (gain)	$ 2,829	$ 4,091	$ 1,371
Amortization of net loss	(314)	(104)	(35)
Amortization of prior service cost	0	0	0
Total recognized in other comprehensive income	2,515	3,987	1,336
Total recognized in net periodic benefit cost and other comprehensive income	2,959	4,165	1,526
Other Postretirement Benefit Plans Defined Benefit [Member]
Net loss (gain)	55	30	(102)
Amortization of net loss	0	0	0
Amortization of prior service cost	0	111	111
Total recognized in other comprehensive income	55	141	9
Total recognized in net periodic benefit cost and other comprehensive income	$ 169	$ 139	$ 5