Defined Benefit Pension Obligation - Obligations and Funded Status (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Change in benefit obligation:
Actuarial (gain)/loss	$ (600)
Amounts recognized within the consolidated balance sheets:
Assets	490,927	$ 438,181
Defined benefit pension plan
Change in benefit obligation:
Benefit obligation—beginning of fiscal year	17,577	14,254
Service cost	2,003	1,865	$ 1,887
Interest cost	62	128	97
Plan participants’ contributions	2,886	1,818
Plan amendment	975
Actuarial (gain)/loss	(615)	742
Foreign currency changes	545	250
Benefit and expense payments	(5,007)	(1,480)
Benefit obligation—end of fiscal year	18,426	17,577	14,254
Change in plan assets:
Plan assets—beginning of fiscal year	14,228	12,192
Employer contributions	1,327	1,373	1,300
Actual return on plan assets	112	122
Plan participants’ contributions	2,885	1,818
Foreign currency changes	413	203
Benefit and expense payments	(5,007)	(1,480)
Plan assets—end of fiscal year	13,958	14,228	$ 12,192
Funded status	(4,468)	(3,349)
Amounts recognized within the consolidated balance sheets:
Long-term other liabilities	4,468	3,349
Net amount recognized	$ 4,468	$ 3,349