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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, 2020 | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Accumulated other comprehensive loss at beginning of period | $ (11,976) | $ (12,070) | $ (10,238) | $ (10,308) | $ (12,070) | $ (10,308)
Total other comprehensive income, before tax | 122 |  | 91 |  | 245 | 182
Total tax expense | (28) | (29) | (22) | (21) | (57) | (43)
Other comprehensive income, net of tax | 94 | 94 | 69 | 70 | 188 | 139
Accumulated other comprehensive loss at end of period | (11,882) | $ (11,976) | (10,169) | $ (10,238) | (11,882) | (10,169)
Defined Benefit Pension Plan [Member] |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Amortization of unrecognized net (gain) loss | 173 |  | 143 |  | 346 | 286
Postretirement Benefit Plan [Member] |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Amortization of unrecognized net (gain) loss | (5) |  | (6) |  | (10) | (13)
Amortization of prior service credit | $ (46) |  | $ (46) |  | $ (91) | $ (91)

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