Summary Of Significant Accounting Policies (Schedule Of Amounts Reclassified Out Of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands		12 Months Ended
		Jun. 30, 2020		Jun. 30, 2019		Jun. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss at beginning of year		$ (10,308)		$ (8,259)
Net loss arising during the period		(2,662)		(2,902)		$ 3,041
Total other comprehensive loss, before tax		(2,298)		(2,674)		3,395
Total tax benefit		536		625		(829)
Other comprehensive loss, net of tax		(1,762)		(2,049)		2,566
Accumulated other comprehensive loss at end of year		(12,070)		(10,308)		(8,259)
Defined Benefit Pension Plans [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss at beginning of year		(11,606)
Net loss arising during the period		(2,597)		(2,771)
Amortization of unrecognized net loss (gain)		572	[1]	447	[1]	$ 572
Accumulated other comprehensive loss at end of year		(13,157)		(11,606)
Postretirement Benefit Plan [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net loss arising during the period	[2]	(65)		(131)
Amortization of unrecognized net loss (gain)	[2]	(26)		(37)
Amortization of prior service credit	[2]	$ (182)		$ (182)

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

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