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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 | 6 Months Ended
--- | --- | ---
Dec. 31, 2021 | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Accumulated other comprehensive loss at beginning of period | $ (8,211) | $ (8,253) | $ (11,976) | $ (12,070) | $ (8,253) | $ (12,070)
Total other comprehensive income, before tax | 54 |  | 122 |  | 109 | 245
Total tax expense | (13) | (13) | (28) | (29) | (26) | (57)
Other comprehensive income, net of tax | 41 | 42 | 94 | 94 | 83 | 188
Accumulated other comprehensive loss at end of period | (8,170) | $ (8,211) | (11,882) | $ (11,976) | (8,170) | (11,882)
Defined Benefit Pension Plan [Member] |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Amortization of unrecognized net (gain) loss | 107 |  | 173 |  | 214 | 346
Postretirement Benefit Plan [Member] |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Amortization of unrecognized net (gain) loss | (7) |  | (5) |  | (14) | (10)
Amortization of prior service credit | $ (46) |  | $ (46) |  | $ (91) | $ (91)

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