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Commitments And Contingencies (Narrative) (Details)
R in Millions, $ in Millions
Mar. 31, 2020
USD ($)
Mar. 31, 2020
ZAR (R)
Guarantor Obligations [Line Items]    
Maximum payment amount under guarantee $ 5.2 R 93.6
Unsecured Counter Guarantee [Member]    
Guarantor Obligations [Line Items]    
Guarantee amount $ 5.2 R 93.6
Payment Guarantee [Member] | Minimum [Member]    
Guarantor Obligations [Line Items]    
Commission charge rate 0.40% 0.40%
Payment Guarantee [Member] | Maximum [Member]    
Guarantor Obligations [Line Items]    
Commission charge rate 1.94% 1.94%
Nedbank [Member] | Guarantee [Member]    
Guarantor Obligations [Line Items]    
Guarantee amount $ 5.2 R 93.6