Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net change in accumulated other comprehensive income (loss)	$ 8,341,000	$ (51,251,000)	$ 42,128,000	$ (83,422,000)
Foreign currency translation adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications	8,336,000	(51,222,000)	42,197,000	(82,958,000)
Deferred gains/(losses) on cash flow hedging instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications	0	45,000	39,000	101,000
Amounts reclassified into income	0	(55,000)	(106,000)	(506,000)
Amounts reclassified into income for deferred gains/(losses) on cash flow hedging instruments	0	530,000	132,000	1,150,000
Unrealized gain/(loss) on available for sale investment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications	5,000	(19,000)	(2,000)	(69,000)
Amounts reclassified into income	0	0	0	10,000
Amounts reclassified into income for deferred gains/(losses) on cash flow hedging instruments	0		0	16,000
Intra-entity foreign currency transactions [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications	$ 315,000	$ (12,908,000)	$ 1,066,000	$ (20,061,000)