Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net change in accumulated other comprehensive income (loss)	$ 37,767,000	$ 14,663,000	$ 79,895,000	$ (68,760,000)
Foreign currency translation adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications	37,868,000	14,630,000	80,065,000	(68,329,000)
Deferred gains/(losses) on cash flow hedging instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications	0	2,000	39,000	103,000
Amounts reclassified into income	0	(19,000)	(106,000)	(525,000)
Amounts reclassified into income for deferred gains/(losses) on cash flow hedging instruments	0	23,000	132,000	1,173,000
Unrealized gain/(loss) on available for sale investment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications	(101,000)	47,000	(103,000)	(22,000)
Amounts reclassified into income	0	3,000	0	13,000
Amounts reclassified into income for deferred gains/(losses) on cash flow hedging instruments	0	5,000	0	21,000
Intra-entity foreign currency transactions [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications	$ 670,000	$ (2,017,000)	$ 1,736,000	$ 18,043,000