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Summary Of Significant Accounting Policies (Schedule Of Amounts Reclassified Out Of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
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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) |

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