Income Taxes (Provision For Income Taxes By Location Of Taxing Jurisdiction) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020
Income Tax [Line Items]
Current income tax expense (benefit)	$ 2,309	$ 859	$ 1,652
Deferred taxation (benefit) charge	(2,044)	6,691	932
Foreign tax credits generated-United States	62	10	72
Income tax provision	327	7,560	2,656
South Africa [Member]
Income Tax [Line Items]
Current income tax expense (benefit)	2,309	866	1,552
Deferred taxation (benefit) charge	(2,154)	(2,039)	653
United States [Member]
Income Tax [Line Items]
Current income tax expense (benefit)	0	(75)	12
Deferred taxation (benefit) charge	0	9,136	0
Other Income Tax Segment [Member]
Income Tax [Line Items]
Current income tax expense (benefit)	0	68	88
Deferred taxation (benefit) charge	$ 110	$ (406)	$ 279