Accumulated Other Comprehensive Loss (Summary Of Reclassifications Out Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Provision for income taxes		$ (71)	$ (52)	$ (213)	$ (153)
Total net of tax		(119)	(85)	(357)	(257)
Total net of tax			(195)		(187)
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	137	570	410
Total before tax	[1]	190	137	570	410
Provision for income taxes	[1]	71	52	213	153
Total net of tax	[1]	119	85	357	257
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]		(288)		(393)
Total before tax			(288)		(393)
Provision for income taxes	[3]		(43)		(59)
Total net of tax			$ (245)		$ (334)

[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