Summary Of Significant Accounting Policies (Schedule Of Amounts Reclassified Out Of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss at beginning of period	$ (8,215)	$ (8,880)	$ (8,259)	$ (8,936)
Total other comprehensive income, before tax	57	88	114	177
Total tax expense	(14)	(33)	(27)	(66)
Other comprehensive income, net of tax	43	55	87	111
Accumulated other comprehensive loss at end of period	(8,172)	(8,825)	(8,172)	(8,825)
Defined Benefit Pension Plan [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of unrecognized net (gain) loss	112	143	224	286
Postretirement Benefit Plan [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of unrecognized net (gain) loss	(10)	(9)	(19)	(18)
Amortization of prior service credit	$ (45)	$ (46)	$ (91)	$ (91)