Accumulated Other Comprehensive Loss (Summary Of Reclassifications Out Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Provision for income taxes		$ (71)	$ (76)	$ (142)	$ (101)
Total net of tax		(119)	(128)	(238)	(172)
Total net of tax			83		8
Reclassification out of Accumulated Other Comprehensive Income (loss) [Member] | Pension And Postretirement Plans [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of net loss	[1]	190	204	380	273
Total before tax	[1]	190	204	380	273
Provision for income taxes	[1]	71	76	142	101
Total net of tax	[1]	119	128	238	172
Reclassification out of Accumulated Other Comprehensive Income (loss) [Member] | Unrealized Gains and Losses on Available-for-Sale Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Realized gains on available-for-sale securities into earnings	[2]				(105)
Total before tax					(105)
Provision for income taxes	[3]				(16)
Total net of tax					$ (89)

[1] These accumulated other comprehensive loss components are included in the computation of net periodic benefit costs (refer to Note 5 of the Notes to Consolidated Financial Statements for additional details regarding employee benefit plans).

[2] This amount is reported in Interest Expense, net on the Consolidated Statements of Operations

[3] This amount is reported in Income Tax Expense (Benefit) on the Consolidated Statements of Operations