Summary Of Significant Accounting Policies (Schedule Of Amounts Reclassified Out Of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss at beginning of year	$ (11,172)	$ (8,253)
Net gain (loss) arising during the period	1,859	(4,029)	$ 4,490
Total other comprehensive income (loss), before tax	2,357	(3,809)	4,981
Total tax (expense) benefit	(550)	890	(1,164)
Other comprehensive income (loss), net of tax	1,807	(2,919)	3,817
Accumulated other comprehensive loss at end of year	(9,365)	(11,172)	(8,253)
Defined Benefit Pension Plans [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss at beginning of year	(12,336)
Net gain (loss) arising during the period	1,527	(4,388)
Amortization of unrecognized net loss (gain)	725	428	$ 692
Accumulated other comprehensive loss at end of year	(10,610)	(12,336)
Postretirement Benefit Plan [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net gain (loss) arising during the period	332	359
Amortization of unrecognized net loss (gain)	(46)	(27)
Amortization of prior service credit	$ (181)	$ (181)