Summary Of Significant Accounting Policies (Schedule Of Amounts Reclassified Out Of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands		12 Months Ended
		Jun. 30, 2018		Jun. 30, 2017		Jun. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss at beginning of year		$ (8,936)		$ (11,350)
Net gain (loss) arising during the period		3,041		3,334		$ (4,200)
Total other comprehensive income, before tax		3,395		3,829		(2,051)
Total tax expense		(829)		(1,415)		758
Other comprehensive income, net of tax		2,566		2,414		(1,293)
Tax Cuts and Jobs Act of 2017, Reclassification from accumulated other comprehensive loss to retained earnings		(1,889)	[1]	0
Accumulated other comprehensive loss at end of year		(8,259)		(8,936)		(11,350)
Defined Benefit Pension Plans [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss at beginning of year		(10,328)
Net gain (loss) arising during the period		2,987		3,339
Amortization of unrecognized net loss (gain)		572	[2]	715	[2]	$ 539
Accumulated other comprehensive loss at end of year		(9,825)		(10,328)
Postretirement Benefit Plan [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net gain (loss) arising during the period	[3]	54		(5)
Amortization of unrecognized net loss (gain)	[3]	(36)		(38)
Amortization of prior service credit	[3]	$ (182)		$ (182)

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

[2] Included in the computation of net periodic benefit income/cost. See Note 12 for additional information.

[3] Additional disclosures for postretirement benefits are not included as they are not considered material.