Accumulated Other Comprehensive (Loss) Income (Change In Accumulated Other Comprehensive (Loss) Income Per Component) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2018		Jun. 30, 2017		Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (162,569)	[1]	$ (189,700)		$ (139,181)
Movement in foreign currency translation reserve	(19,441)		29,828		(49,479)
Movement in foreign currency translation reserve related to equity accounted investment	(2,426)		(2,697)
Unrealized income on asset available for sale, net of tax	25,199				692
Release of gain on asset available for sale, net of taxes					(1,732)
Ending Balance	(159,237)		(162,569)	[1]	(189,700)
Accumulated Foreign Currency Translation Reserve [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(162,569)		(189,700)		(140,221)
Movement in foreign currency translation reserve	(19,441)		29,828		(49,479)
Movement in foreign currency translation reserve related to equity accounted investment	(2,426)		(2,697)
Unrealized income on asset available for sale, net of tax
Release of gain on asset available for sale, net of taxes
Ending Balance	(184,436)		(162,569)		(189,700)
Accumulated Net Unrealized Income (Loss) On Asset Available For Sale, Net Of Tax [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance					1,040
Movement in foreign currency translation reserve
Movement in foreign currency translation reserve related to equity accounted investment
Unrealized income on asset available for sale, net of tax	25,199				692
Release of gain on asset available for sale, net of taxes					(1,732)
Ending Balance	$ 25,199
Unrealized income on asset available for sale, tax			7,274		159
Release of gain on asset available for sale, tax			$ 444		$ 444

[1] Refer to Note 1.