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Summary Of Significant Accounting Policies (Schedule Of Amounts Reclassified Out Of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Accumulated other comprehensive loss at beginning of year |  | $ (8,936) |  | $ (11,350) |  |
Net gain (loss) arising during the period |  | 3,041 |  | 3,334 |  | $ (4,200)
Total other comprehensive income, before tax |  | 3,395 |  | 3,829 |  | (2,051)
Total tax expense |  | (829) |  | (1,415) |  | 758
Other comprehensive income, net of tax |  | 2,566 |  | 2,414 |  | (1,293)
Tax Cuts and Jobs Act of 2017, Reclassification from accumulated other comprehensive loss to retained earnings |  | (1,889) | [1] | 0 |  |
Accumulated other comprehensive loss at end of year |  | (8,259) |  | (8,936) |  | (11,350)
Defined Benefit Pension Plans [Member] |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Accumulated other comprehensive loss at beginning of year |  | (10,328) |  |  |  |
Net gain (loss) arising during the period |  | 2,987 |  | 3,339 |  |
Amortization of unrecognized net loss (gain) |  | 572 | [2] | 715 | [2] | $ 539
Accumulated other comprehensive loss at end of year |  | (9,825) |  | (10,328) |  |
Postretirement Benefit Plan [Member] |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Net gain (loss) arising during the period | [3] | 54 |  | (5) |  |
Amortization of unrecognized net loss (gain) | [3] | (36) |  | (38) |  |
Amortization of prior service credit | [3] | $ (182) |  | $ (182) |  |
[1] | See further discussion of this reclassification under the caption “Recently Adopted Accounting Standards” within Note 1.
[2] | Included in the computation of net periodic benefit income/cost. See Note 12 for additional information.
[3] | Additional disclosures for postretirement benefits are not included as they are not considered material.

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