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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, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Mar. 31, 2022 | Mar. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Accumulated other comprehensive loss at beginning of period | $ (8,170) |  | $ (8,253) | $ (11,882) |  | $ (12,070) | $ (8,253) | $ (12,070)
Total other comprehensive income, before tax | 56 |  |  | 122 |  |  | 165 | 367
Total tax expense | (13) | $ (13) | (13) | (28) | $ (28) | (29) | (39) | (85)
Other comprehensive income, net of tax | 43 | 41 | $ 42 | 94 | 94 | $ 94 | 126 | 282
Accumulated other comprehensive loss at end of period | (8,127) | $ (8,170) |  | (11,788) | $ (11,882) |  | (8,127) | (11,788)
Defined Benefit Pension Plan [Member] |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Amortization of unrecognized net (gain) loss | 107 |  |  | 172 |  |  | 321 | 518
Postretirement Benefit Plan [Member] |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Amortization of unrecognized net (gain) loss | (6) |  |  | (5) |  |  | (20) | (15)
Amortization of prior service credit | $ (45) |  |  | $ (45) |  |  | $ (136) | $ (136)

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