Accumulated Other Comprehensive (Loss) Income (Details) - USD ($)	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net change in accumulated other comprehensive (loss) income	$ (27,948,000)	$ 8,341,000	$ (41,467,000)	$ 42,128,000
Foreign currency translation adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications	(27,948,000)	8,336,000	(41,467,000)	42,197,000
Deferred gains/(losses) on cash flow hedging instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications	0	0	0	39,000
Amounts reclassified into income	0	0	0	(106,000)
Amounts reclassified into income for deferred gains/(losses) on cash flow hedging instruments	0	0	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	5,000	0	(2,000)
Intra-entity foreign currency transactions [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications	$ (313,000)	$ 315,000	$ (472,000)	$ 1,066,000