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, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss at beginning of period	$ (8,880)	$ (11,272)	$ (8,936)	$ (11,350)
Total other comprehensive income, before tax	88	123	177	248
Total tax expense	(33)	(45)	(66)	(92)
Other comprehensive income, net of tax	55	78	111	156
Accumulated other comprehensive loss at end of period	(8,825)	(11,194)	(8,825)	(11,194)
Defined Benefit Pension Plan [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of unrecognized net (gain) loss	143	178	286	357
Postretirement Benefit Plan [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of unrecognized net (gain) loss	(9)	(10)	(18)	(19)
Amortization of prior service credit	$ (46)	$ (45)	$ (91)	$ (90)