Summary Of Significant Accounting Policies (Schedule Of Amounts Reclassified Out Of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Mar. 31, 2018		Mar. 31, 2017	Mar. 31, 2018		Mar. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss at beginning of period	$ (8,825)		$ (11,194)	$ (8,936)		$ (11,350)
Total other comprehensive income, before tax	89		124	266		372
Total tax expense	(27)		(46)	(93)		(138)
Other comprehensive income, net of tax	62		78	173		234
Tax Cuts and Jobs Act of 2017, Reclassification from accumulated other comprehensive loss to retained earnings	(1,889)	[1]	0	(1,889)	[1]	0
Accumulated other comprehensive loss at end of period	(10,652)		(11,116)	(10,652)		(11,116)
Defined Benefit Pension Plan [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of unrecognized net (gain) loss	143		179	429		536
Postretirement Benefit Plan [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of unrecognized net (gain) loss	(9)		(9)	(27)		(28)
Amortization of prior service credit	$ (45)		$ (46)	$ (136)		$ (136)

[1] See further discussion of this reclassification under the caption “Recently Adopted Accounting Standards” within Note 1.