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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 | 9 Months Ended
--- | --- | ---
Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Mar. 31, 2023 | Mar. 31, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Accumulated other comprehensive loss at beginning of period | $ (10,982) |  | $ (11,172) | $ (8,170) |  | $ (8,253) | $ (11,172) | $ (8,253)
Total other comprehensive income, before tax | 125 |  |  | 56 |  |  | 374 | 165
Total tax expense | (28) | $ (30) | (29) | (13) | $ (13) | (13) | (87) | (39)
Other comprehensive income, net of tax | 97 | 95 | $ 95 | 43 | 41 | $ 42 | 287 | 126
Accumulated other comprehensive loss at end of period | (10,885) | $ (10,982) |  | (8,127) | $ (8,170) |  | (10,885) | (8,127)
Defined Benefit Pension Plan [Member] |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Amortization of unrecognized net (gain) loss | 181 |  |  | 107 |  |  | 544 | 321
Postretirement Benefit Plan [Member] |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Amortization of unrecognized net (gain) loss | (11) |  |  | (6) |  |  | (34) | (20)
Amortization of prior service credit | $ (45) |  |  | $ (45) |  |  | $ (136) | $ (136)

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