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Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Jun. 30, 2018
Income Taxes [Line Items]
Federal statutory income tax rate (percent)						28.00%
Income tax expense (benefit), reversal of unrecognized tax benefit				$ (700)
Tax Cuts and Jobs Act of 2017, income tax expense (benefit)		$ (200)
Effective income tax rate				25.40%
Transition tax on repatriation of foreign earnings				$ 9,400		$ 9,600
Gross unrecognized tax benefits	$ 1,200			1,200		2,100
Unrecognized tax benefits that would impact effective tax rate if recognized	1,000			1,000
Income tax penalties and interest accrued	1,000			1,000		1,200
Income (loss) before income taxes	15,795		$ 15,792	$ 61,670	$ 42,883
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						(1,600)
Administration of the Treasury, Belgium [Member]
Income Taxes [Line Items]
Provisional income tax expense (benefit) due to remeasurement of deferred tax liabilities						$ 1,000
Income (loss) before income taxes	$ (800)			$ 700

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