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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, 2020 | Jun. 30, 2019 | Jun. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Accumulated other comprehensive loss at beginning of year |  | $ (10,308) |  | $ (8,259) |  |
Net loss arising during the period |  | (2,662) |  | (2,902) |  | $ 3,041
Total other comprehensive loss, before tax |  | (2,298) |  | (2,674) |  | 3,395
Total tax benefit |  | 536 |  | 625 |  | (829)
Other comprehensive loss, net of tax |  | (1,762) |  | (2,049) |  | 2,566
Accumulated other comprehensive loss at end of year |  | (12,070) |  | (10,308) |  | (8,259)
Defined Benefit Pension Plans [Member] |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Accumulated other comprehensive loss at beginning of year |  | (11,606) |  |  |  |
Net loss arising during the period |  | (2,597) |  | (2,771) |  |
Amortization of unrecognized net loss (gain) |  | 572 | [1] | 447 | [1] | $ 572
Accumulated other comprehensive loss at end of year |  | (13,157) |  | (11,606) |  |
Postretirement Benefit Plan [Member] |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Net loss arising during the period | [2] | (65) |  | (131) |  |
Amortization of unrecognized net loss (gain) | [2] | (26) |  | (37) |  |
Amortization of prior service credit | [2] | $ (182) |  | $ (182) |  |
[1] | Included in the computation of net periodic benefit income/cost. See Note 12 for additional information.
[2] | Additional disclosures for postretirement benefits are not included as they are not considered material.

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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