Accumulated Other Comprehensive Loss (Change In Accumulated Other Comprehensive (Loss) Income Per Component) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019		Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (198,272)	$ (123,359)	$ (184,436)	[1]	$ (162,569)
Movement in foreign currency translation reserve related to equity accounted investment			5,430		(227)	[2]
Release of foreign currency translation reserve related to disposal of DNI (Note 2)	1,806		1,806
Movement in foreign currency translation reserve	(7,872)	20,512	(27,138)		59,949
Ending Balance	(204,338)	(102,847)	(204,338)		(102,847)
Accumulated Foreign Currency Translation Reserve [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(198,272)	(123,359)	(184,436)		(162,569)
Movement in foreign currency translation reserve related to equity accounted investment			5,430		(227)
Release of foreign currency translation reserve related to disposal of DNI (Note 2)	1,806		1,806
Movement in foreign currency translation reserve	(7,872)	20,512	(27,138)		59,949
Ending Balance	$ (204,338)	$ (102,847)	$ (204,338)		$ (102,847)

[1] Derived from audited financial statements filed on Form 10-K/A on December 6, 2018 (Note 1)

[2] Refer to Note 1.