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, 2017	Jun. 30, 2016	Jun. 30, 2015
Net Periodic Benefit Costs:
Service cost	$ 1,996	$ 1,903	$ 980
Interest cost	49	76	107
Expected returns on assets	(132)	(102)	(92)
Amortization of prior service cost (credit)	(46)
Amortization of net loss	114	53	3
Net periodic benefit costs	1,981	1,930	998
Other Amounts Recognized in Other Comprehensive Loss:
Net (gain) loss arising during the year	(881)	1,093	953
Prior service cost (credit)	46	(491)
Amortization of net (gain) loss	(114)	(53)	(3)
Total recognized in other comprehensive loss	(949)	549	950
Total recognized in net periodic benefit costs and other comprehensive loss	1,032	$ 2,479	$ 1,948
Amounts in accumulated other comprehensive loss that are expected to be recognized as components of net periodic benefit cost during fiscal year 2018
Net loss	1,582
Prior service cost (credit)	(429)
Accumulated other comprehensive loss	$ (1,153)