Income Taxes (Components Of Income Before Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019		Jun. 30, 2018
Income Tax [Line Items]
Loss before income tax	$ (65,016)	$ (319,443)	[1]	$ 94,558	[1]
South Africa [Member]
Income Tax [Line Items]
Loss before income tax	(26,230)	(273,265)		131,366
United States [Member]
Income Tax [Line Items]
Loss before income tax	(8,984)	(23,479)		(15,329)
Other Income Tax Segment [Member]
Income Tax [Line Items]
Loss before income tax	$ (12,283)	$ (22,699)		$ (21,479)

[1] Refer to Note 1