Defined Benefit Pension Obligation - Components of Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive Loss (Details) - Defined benefit pension plan - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2021
Net Periodic Benefit Costs:
Service cost	$ 2,003	$ 1,865	$ 1,887
Interest cost	62	128	97
Expected returns on assets	(151)	(170)	(156)
Amortization of prior service cost	(2)	(55)	(44)
Amortization of net loss			11
Settlement charges	178
Net periodic benefit costs	2,090	1,768	1,795
Other Amounts Recognized in Other Comprehensive Loss:
Net (gain) loss arising during the year	(593)	801	(901)
Prior service cost	2		(105)
Amortization of prior service cost	1,005	55	44
Amortization of net gain			(11)
Effect of settlement	(178)
Total recognized in other comprehensive (gain) loss	236	856	(973)
Total recognized in net periodic benefit costs and other comprehensive loss	$ 2,326	$ 2,624	$ 822
Scenario Forecast
Amounts in accumulated other comprehensive loss that are expected to be recognized as components of net periodic benefit cost during fiscal year 2020
Net loss				$ 852
Prior service credit				506
Accumulated other comprehensive loss				$ 1,358