Income Taxes (Narrative) (Details) - USD ($)	12 Months Ended
	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%