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, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss at beginning of period	$ (11,272)	$ (9,976)	$ (11,350)	$ (10,057)
Total other comprehensive income, before tax	123	2,134	248	2,264
Total tax expense	(45)	(789)	(92)	(838)
Other comprehensive income, net of tax	78	1,345	156	1,426
Accumulated other comprehensive loss at end of period	(11,194)	(8,631)	(11,194)	(8,631)
Pension Benefits [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of unrecognized net (gain) loss	178	135	357	270
Postretirement Benefits [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of unrecognized net (gain) loss	(10)	(8)	(19)	(12)
Prior service credit arising during the period	0	2,038	0	2,038
Amortization of prior service credit	$ (45)	$ (31)	$ (90)	$ (32)