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Summary Of Significant Accounting Policies (Schedule Of Amounts Reclassified Out Of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Accumulated other comprehensive loss at beginning of period | $ (8,253) | $ (12,070)
Total other comprehensive income, before tax | 55 | 123
Total tax expense | (13) | (29)
Other comprehensive income, net of tax | 42 | 94
Accumulated other comprehensive loss at end of period | (8,211) | (11,976)
Defined Benefit Pension Plan [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Amortization of unrecognized net (gain) loss | 107 | 173
Postretirement Benefit Plan [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Amortization of unrecognized net (gain) loss | (7) | (5)
Amortization of prior service credit | $ (45) | $ (45)

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