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Commitments And Contingencies (Narrative) (Details)
R in Millions, $ in Millions
Sep. 30, 2019
ZAR (R)
Sep. 30, 2019
USD ($)
Guarantor Obligations [Line Items]    
Maximum payment amount under guarantee R 93.6 $ 6.2
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 R 93.6 $ 6.2
Nedbank [Member] | Unsecured Counter Guarantee [Member]    
Guarantor Obligations [Line Items]    
Guarantee amount R 93.6 $ 6.2