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Income Taxes (Narrative) (Details) - USD ($) | 12 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Income Tax Disclosure [Abstract] |  |  |  |
Federal statutory income tax rate | 21.00% | 21.00% | 28.10% | 35.00%
One-time benefit on re-measurement of net deferred tax liability |  |  | $ 9,500,000 |
Gross tax contingency reserve | $ 968,000 | $ 1,670,000 | $ 1,298,000 |
Accrued tax liabilities included in the gross tax contingency reserve | 500,000 |  |  |
Accrued interest and penalties included in the gross tax contingency reserve | 481,000 | 669,000 |  |
Gross tax contingency reserve, classified as current liabilities | 0 |  |  |
Gross tax contingency reserve, classified as noncurrent liabilities | 968,000 | 942,000 |  |
Federal [Member] |  |  |  |
Income Tax Authority [Line Items] |  |  |  |
Prepaid income taxes | $ 5,300,000 | $ 5,200,000 |  |

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- Definition Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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