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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)