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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, 2020
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Accumulated other comprehensive loss at beginning of period $ (11,976) $ (12,070) $ (10,238) $ (10,308) $ (12,070) $ (10,308)
Total other comprehensive income, before tax 122   91   245 182
Total tax expense (28) (29) (22) (21) (57) (43)
Other comprehensive income, net of tax 94 94 69 70 188 139
Accumulated other comprehensive loss at end of period (11,882) $ (11,976) (10,169) $ (10,238) (11,882) (10,169)
Defined Benefit Pension Plan [Member]            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Amortization of unrecognized net (gain) loss 173   143   346 286
Postretirement Benefit Plan [Member]            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Amortization of unrecognized net (gain) loss (5)   (6)   (10) (13)
Amortization of prior service credit $ (46)   $ (46)   $ (91) $ (91)