Defined Benefit Pension Obligation - Assumptions (Details) - Defined benefit pension plan	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Net Periodic Benefit Costs:
Discount rate (as a percent)	0.90%	0.70%	0.40%
Rate of compensation increase (as a percent)	1.50%	2.00%	2.00%
Expected long-term return on assets (as a percent)	1.40%	1.40%	1.40%
Benefit Obligation:
Discount rate (as a percent)	0.90%	1.40%
Rate of compensation increase (as a percent)	1.50%	2.00%