Commitments And Contingencies (Narrative) (Details) item in Millions, R in Millions, $ in Millions	1 Months Ended
	Feb. 28, 2018 ZAR (R)	Mar. 31, 2015 ZAR (R)	Jun. 30, 2014 ZAR (R) item	Mar. 31, 2018 ZAR (R)	Mar. 31, 2018 USD ($)
Guarantor Obligations [Line Items]
Maximum payment amount under guarantee				R 108.0	$ 9.1
Additional Implementation Costs [Member] | Excluding VAT [Member]
Guarantor Obligations [Line Items]
Proceeds received from SASSA			R 277.0
Counter Guarantee [Member]
Guarantor Obligations [Line Items]
Guarantee amount				R 108.0	$ 9.1
Payment Guarantee [Member] | Minimum [Member]
Guarantor Obligations [Line Items]
Charge rate				0.40%	0.40%
Payment Guarantee [Member] | Maximum [Member]
Guarantor Obligations [Line Items]
Charge rate				1.90%	1.90%
Nedbank [Member] | Guarantee [Member]
Guarantor Obligations [Line Items]
Guarantee amount				R 108.0	$ 9.1
CPS [Member] | Additional Implementation Costs [Member]
Guarantor Obligations [Line Items]
Number of additional registrations | item			11.0
Amount ordered to refund to SASSA	R 317.0
SASSA [Member] | Additional Implementation Costs [Member]
Guarantor Obligations [Line Items]
Amount to approve a payment to CPS		R 317.0
SASSA [Member] | Additional Implementation Costs [Member] | Excluding VAT [Member]
Guarantor Obligations [Line Items]
Amount to approve a payment to CPS		R 277.0