Defined Benefit Pension Obligation - Obligations and Funded Status (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Change in benefit obligation:
Actuarial gain	$ (900)
Amounts recognized within the consolidated balance sheets:
Assets	378,727	$ 406,464
Defined benefit pension plan
Change in benefit obligation:
Benefit obligation—beginning of fiscal year	13,979	12,435
Service cost	1,887	1,996	$ 1,903
Interest cost	97	49	76
Plan participants’ contributions	1,878	1,945
Plan amendment	(108)
Actuarial gain	(935)	(846)
Foreign currency changes	(470)	265
Benefit and expense payments	(2,074)	(1,865)
Benefit obligation—end of fiscal year	14,254	13,979	12,435
Change in plan assets:
Plan assets—beginning of fiscal year	11,293	9,572
Employer contributions	1,347	1,283	1,200
Actual return on plan assets	141	137
Plan participants’ contributions	1,878	1,945
Foreign currency changes	(393)	221
Benefit and expense payments	(2,074)	(1,865)
Plan assets—end of fiscal year	12,192	11,293	$ 9,572
Funded status	(2,062)	(2,686)
Amounts recognized within the consolidated balance sheets:
Long-term other liabilities	2,062	2,686
Net amount recognized	$ 2,062	$ 2,686