Accumulated Other Comprehensive Loss (Details) - USD ($)	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Accumulated Other Comprehensive (Loss) Income [Line Items]
Beginning Balance	$ 399,686,000
Other comprehensive income before reclassifications	19,000	$ (41,000)
Other comprehensive income (loss), net of tax:	19,000	(41,000)
Ending Balance	339,315,000
Reclassification from AOCI	0
Currency Translation Adjustments
Accumulated Other Comprehensive (Loss) Income [Line Items]
Beginning Balance	(339,000)	(234,000)
Other comprehensive income before reclassifications	4,000	(73,000)
Other comprehensive income (loss), net of tax:	4,000	(73,000)
Ending Balance	(335,000)	(307,000)
Net Unrealized Gains (Losses) on Available- for-Sale Securities
Accumulated Other Comprehensive (Loss) Income [Line Items]
Beginning Balance	(14,000)	(69,000)
Other comprehensive income before reclassifications	15,000	32,000
Other comprehensive income (loss), net of tax:	15,000	32,000
Ending Balance	1,000	(37,000)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive (Loss) Income [Line Items]
Beginning Balance	(353,000)	(303,000)
Ending Balance	$ (334,000)	$ (344,000)