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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, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Mar. 31, 2021 | Mar. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Accumulated other comprehensive loss at beginning of period | $ (11,882) |  | $ (12,070) | $ (10,169) |  | $ (10,308) | $ (12,070) | $ (10,308)
Total other comprehensive income, before tax | 122 |  |  | 91 |  |  | 367 | 273
Total tax expense | (28) | $ (28) | (29) | (21) | $ (22) | (21) | (85) | (64)
Other comprehensive income, net of tax | 94 | 94 | $ 94 | 70 | 69 | $ 70 | 282 | 209
Accumulated other comprehensive loss at end of period | (11,788) | $ (11,882) |  | (10,099) | $ (10,169) |  | (11,788) | (10,099)
Defined Benefit Pension Plan [Member] |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Amortization of unrecognized net (gain) loss | 172 |  |  | 143 |  |  | 518 | 429
Postretirement Benefit Plan [Member] |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Amortization of unrecognized net (gain) loss | (5) |  |  | (7) |  |  | (15) | (20)
Amortization of prior service credit | $ (45) |  |  | $ (45) |  |  | $ (136) | $ (136)

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