Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net change in accumulated other comprehensive (loss) income	$ (13,519,000)	$ 33,787,000
Foreign currency translation adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications	(13,519,000)	33,861,000
Deferred gains/(losses) on cash flow hedging instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications	0	39,000
Amounts reclassified into income	0	(106,000)
Amounts reclassified into income for deferred gains/(losses) on cash flow hedging instruments	0	132,000
Unrealized gain/(loss) on available for sale investment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications	0	(7,000)
Intra-entity foreign currency transactions [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications	$ (159,000)	$ 751,000