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Commitments And Contingencies (Narrative) (Details)
R in Millions, $ in Millions
12 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2020
ZAR (R)
Jun. 30, 2019
USD ($)
Guarantor Obligations [Line Items]      
Outstanding capital commitments $ 0.1   $ 0.2
Purchase obligations $ 1.7   $ 3.5
Guarantee [Member] | Minimum [Member]      
Guarantor Obligations [Line Items]      
Guarantees commission fee percent per annum 0.40%    
Guarantee [Member] | Maximum [Member]      
Guarantor Obligations [Line Items]      
Guarantees commission fee percent per annum 1.94%    
Nedbank [Member] | Guarantee [Member]      
Guarantor Obligations [Line Items]      
Guarantee amount $ 5.4 R 93.6  
Maximum payment amount under guarantee $ 5.4 R 93.6