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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, 2023
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Dec. 31, 2023
Dec. 31, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Accumulated other comprehensive loss at beginning of period $ (9,289) $ (9,365) $ (11,077) $ (11,172) $ (9,365) $ (11,172)
Total other comprehensive income, before tax 98   125   197 249
Total tax expense (23) (23) (30) (29) (46) (59)
Other comprehensive income, net of tax 75 76 95 95 151 190
Accumulated other comprehensive loss at end of period (9,214) $ (9,289) (10,982) $ (11,077) (9,214) (10,982)
Defined Benefit Pension Plan [Member]            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Amortization of unrecognized net (gain) loss 158   182   317 363
Postretirement Benefit Plan [Member]            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Amortization of unrecognized net (gain) loss (15)   (11)   (30) (23)
Amortization of prior service credit $ (45)   $ (46)   $ (90) $ (91)