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Income Taxes (Narrative) (Details) - USD ($) | 12 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Income Tax Disclosure [Abstract] |  |  |  |
One-time benefit on re-measurement of net deferred tax liability |  | $ 9,500,000 |  |
Tax benefits recorded directly to common stock |  |  | $ 1,100,000 | $ 1,400,000
Gross tax contingency reserve |  | 1,298,000 | 1,808,000 | $ 1,599,000
Accrued tax liabilities included in the gross tax contingency reserve |  | 700,000 |  |
Accrued interest and penalties included in the gross tax contingency reserve |  | 605,000 | 683,000 |
Gross tax contingency reserve, classified as current liabilities |  | 0 |  |
Gross tax contingency reserve, classified as noncurrent liabilities |  | $ 1,298,000 | $ 1,241,000 |
Qualified manufacturing activities deduction percentage |  | 9.00% |  |
Income Tax Authority [Line Items] |  |  |  |
Federal statutory income tax rate |  | 28.10% | 35.00% | 35.00%
Federal [Member] |  |  |  |
Income Tax Authority [Line Items] |  |  |  |
Prepaid income taxes |  | $ 3,600,000 | $ 6,100,000 |
State and Local [Member] |  |  |  |
Income Tax Authority [Line Items] |  |  |  |
Prepaid income taxes |  | $ 900,000 | $ 900,000 |
Scenario, Forecast [Member] |  |  |  |
Income Tax Authority [Line Items] |  |  |  |
Federal statutory income tax rate | 21.00% |  |  |

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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- Definition The tax effect of items occurring during the period that have been charged or credited directly to components of shareholders' equity and are not otherwise defined. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=79507043&loc=d3e39076-109324 + Details
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