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, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss at beginning of period	$ (11,194)	$ (8,631)	$ (11,350)	$ (10,057)
Total other comprehensive income, before tax	124	77	372	2,341
Total tax expense	(46)	(28)	(138)	(866)
Other comprehensive income, net of tax	78	49	234	1,475
Accumulated other comprehensive loss at end of period	(11,116)	(8,582)	(11,116)	(8,582)
Pension Benefits [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of unrecognized net (gain) loss	179	135	536	405
Postretirement Benefits [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of unrecognized net (gain) loss	(9)	(11)	(28)	(23)
Prior service credit arising during the period	0	0	0	2,038
Amortization of prior service credit	$ (46)	$ (47)	$ (136)	$ (79)