Summary Of Significant Accounting Policies (Schedule Of Amounts Reclassified Out Of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss at beginning of year	$ (12,070)	$ (10,308)
Net gain (loss) arising during the period	4,490	(2,662)	$ (2,902)
Total other comprehensive income (loss), before tax	4,981	(2,298)	(2,674)
Total tax (expense) benefit	(1,164)	536	625
Other comprehensive income (loss), net of tax	3,817	(1,762)	(2,049)
Accumulated other comprehensive loss at end of year	(8,253)	(12,070)	(10,308)
Defined Benefit Pension Plans [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss at beginning of year	(13,157)
Net gain (loss) arising during the period	4,340	(2,597)
Amortization of unrecognized net loss (gain)	692	572	$ 447
Accumulated other comprehensive loss at end of year	(9,301)	(13,157)
Postretirement Benefit Plan [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net gain (loss) arising during the period	150	(65)
Amortization of unrecognized net loss (gain)	(20)	(26)
Amortization of prior service credit	$ (181)	$ (182)