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Summary Of Significant Accounting Policies (Tables) | 12 Months Ended
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Jun. 30, 2018
Accounting Policies [Abstract] |
Schedule Of Construction In Progress In Accounts Payable | Purchases of property, plant and equipment included in Accounts Payable and excluded from the property additions and the change in accounts payable in the Consolidated Statements of Cash Flows at June 30 were as follows:
| 2018 |  | 2017 |  | 2016
Construction in progress in Accounts Payable | $ | 2,070 |  |  | $ | 622 |  |  | $ | 1,000 |
Schedule Of Depreciation Expense | The following table sets forth depreciation expense in each of the years ended June 30:
| 2018 |  | 2017 |  | 2016
Depreciation expense | $ | 22,168 |  |  | $ | 20,430 |  |  | $ | 20,114 |
Schedule Of Advertising Expense As A Percentage Of Net Sales | The following table summarizes advertising expense as a percentage of net sales in each of the years ended June 30:
| 2018 |  | 2017 |  | 2016
Advertising expense as a percentage of net sales | 2 | % |  | 3 | % |  | 3 | %
Schedule Of Basic And Diluted Net Income Per Common Share Calculations | Basic and diluted net income per common share were calculated as follows:
| 2018 |  | 2017 |  | 2016
Net income | $ | 135,314 |  |  | $ | 115,314 |  |  | $ | 121,764 |
Net income available to participating securities | (271 | ) |  | (196 | ) |  | (242 | )
Net income available to common shareholders | $ | 135,043 |  |  | $ | 115,118 |  |  | $ | 121,522 |
Weighted average common shares outstanding - basic | 27,403 |  |  | 27,376 |  |  | 27,336 |
Incremental share effect from: |  |  |  |  |
Nonparticipating restricted stock | 3 |  |  | 3 |  |  | 3 |
Stock-settled stock appreciation rights | 53 |  |  | 61 |  |  | 34 |
Weighted average common shares outstanding - diluted | 27,459 |  |  | 27,440 |  |  | 27,373 |
Net income per common share - basic | $ | 4.93 |  |  | $ | 4.21 |  |  | $ | 4.45 |
Net income per common share - diluted | $ | 4.92 |  |  | $ | 4.20 |  |  | $ | 4.44 |
Schedule Of Amounts Reclassified Out Of Accumulated Other Comprehensive Loss | The following table presents the amounts reclassified out of accumulated other comprehensive loss by component:
| 2018 |  | 2017
Accumulated other comprehensive loss at beginning of year | $ | (8,936 | ) |  | $ | (11,350 | )
Defined Benefit Pension Plan Items: |  |  |
Net gain arising during the period | 2,987 |  |  | 3,339 |
Amortization of unrecognized net loss (1) | 572 |  |  | 715 |
Postretirement Benefit Plan Items: (2) |  |  |
Net gain (loss) arising during the period | 54 |  |  | (5 | )
Amortization of unrecognized net gain | (36 | ) |  | (38 | )
Amortization of prior service credit | (182 | ) |  | (182 | )
Total other comprehensive income, before tax | 3,395 |  |  | 3,829 |
Total tax expense | (829 | ) |  | (1,415 | )
Other comprehensive income, net of tax | 2,566 |  |  | 2,414 |
Tax Cuts and Jobs Act of 2017, Reclassification from accumulated other comprehensive loss to retained earnings (3) | (1,889 | ) |  | — |
Accumulated other comprehensive loss at end of year | $ | (8,259 | ) |  | $ | (8,936 | )
(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.
(3) | See further discussion of this reclassification under the caption “Recently Adopted Accounting Standards” within Note 1.

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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