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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Taxes [Line Items]
Federal statutory income tax rate (percent)	31.40%			30.40%
Effective income tax rate	32.60%			46.90%
Transition tax on repatriation of foreign earnings		$ 9,300
Provisional income tax expense		5,800
Gross unrecognized tax benefits	$ 2,100			$ 2,100			$ 2,200
Unrecognized tax benefits that would impact effective tax rate if recognized	1,400			1,400
Income tax penalties and interest accrued	1,200			1,200			$ 1,100
Income (loss) before income taxes	15,792		$ 19,571	$ 42,883	$ 78,075
Minimum [Member]
Income Taxes [Line Items]
Open tax year				2013
Internal Revenue Service (IRS) [Member]
Income Taxes [Line Items]
Provisional income tax expense (benefit) due to remeasurement of deferred tax liabilities		(3,500)
Administration of the Treasury, Belgium [Member]
Income Taxes [Line Items]
Provisional income tax expense (benefit) due to remeasurement of deferred tax liabilities		$ 900
Income (loss) before income taxes	$ (1,500)			$ (3,200)
Scenario, Forecast [Member]
Income Taxes [Line Items]
Federal statutory income tax rate (percent)						28.00%

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