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Summary Of Significant Accounting Policies (Schedule Of Amounts Reclassified Out Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2025 | Sep. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Mar. 31, 2025 | Mar. 31, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |
Accumulated other comprehensive income (loss) at beginning of period | $ 1,010 | $ (8,640) | $ (9,214) |  | $ (9,365) | $ (8,640) | $ (9,365)
Net loss arising during the period | 0 |  | 0 |  |  | (1,549) | 0
Settlement charge | 0 |  | 0 |  |  | 13,968 | 0
Total other comprehensive (loss) income, before tax | (60) |  | 98 |  |  | 12,533 | 295
Total tax benefit (expense) | 14 | (20) | (23) | $ (23) | (23) | (2,929) | (69)
Other comprehensive (loss) income, net of tax | (46) | $ 67 | 75 | 75 | $ 76 | 9,604 | 226
Accumulated other comprehensive income (loss) at end of period | 964 |  | (9,139) | $ (9,214) |  | 964 | (9,139)
Defined Benefit Pension Plan [Member] |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |
Net loss arising during the period | 0 |  | 0 |  |  | (1,549) | 0
Settlement charge | 0 |  | 0 |  |  | 13,968 | 0
Amortization of unrecognized net (gain) loss | 0 |  | 158 |  |  | 294 | 475
Postretirement Benefit Plan [Member] |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |
Amortization of unrecognized net (gain) loss | (15) |  | (15) |  |  | (44) | (45)
Amortization of prior service credit | $ (45) |  | $ (45) |  |  | $ (136) | $ (135)

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