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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, 2019 | Sep. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Accumulated other comprehensive loss at beginning of period | $ (10,308) | $ (8,259)
Total other comprehensive income, before tax | 91 | 57
Total tax expense | (21) | (13)
Other comprehensive income, net of tax | 70 | 44
Accumulated other comprehensive loss at end of period | (10,238) | (8,215)
Defined Benefit Pension Plan [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Amortization of unrecognized net (gain) loss | 143 | 112
Postretirement Benefit Plan [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Amortization of unrecognized net (gain) loss | (7) | (9)
Amortization of prior service credit | $ (45) | $ (46)

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