Borrowings (Narrative) (Details) $ in Thousands, R in Millions	Dec. 31, 2020 USD ($)	Dec. 31, 2020 ZAR (R)	Nov. 02, 2020 ZAR (R)	Nov. 01, 2020 ZAR (R)	Jun. 30, 2020 USD ($)	Jun. 30, 2020 ZAR (R)
Short-term Debt [Line Items]
Short-term facility available	$ 113,162
Overdraft Restricted As To Use For ATM Funding Only [Member]
Short-term Debt [Line Items]
Short-term facility available	98,904
Overdraft Facility [Member]
Short-term Debt [Line Items]
Short-term facility available	3,410
Indirect And Derivative Facilities [Member]
Short-term Debt [Line Items]
Short-term facility available	10,848
Nedbank Limited [Member] | Overdraft Facility [Member]
Short-term Debt [Line Items]
Short-term facility available	20,500	R 300.0
Nedbank Limited [Member] | Overdraft Facility [Member] | Overdraft Restricted As To Use For ATM Funding Only [Member]
Short-term Debt [Line Items]
Short-term facility available	17,100	250.0
Nedbank Limited [Member] | Overdraft Facility [Member] | General Banking Facility [Member]
Short-term Debt [Line Items]
Short-term facility available	3,400	50.0
Nedbank Limited [Member] | Indirect And Derivative Facilities [Member]
Short-term Debt [Line Items]
Short-term facility available	10,800	159.0
Nedbank Limited [Member] | South Africa [Member]
Short-term Debt [Line Items]
Aggregate amount of short-term borrowing	31,300	R 459.0
Nedbank Limited [Member] | South Africa [Member] | Overdraft Restricted As To Use For ATM Funding Only [Member]
Short-term Debt [Line Items]
Short-term facility available	17,052
Nedbank Limited [Member] | South Africa [Member] | Overdraft Facility [Member]
Short-term Debt [Line Items]
Short-term facility available	3,410
Nedbank Limited [Member] | South Africa [Member] | Overdraft Facility [Member] | Overdraft Restricted As To Use For ATM Funding Only [Member]
Short-term Debt [Line Items]
Short-term facility available	31,310
Nedbank Limited [Member] | South Africa [Member] | Indirect And Derivative Facilities [Member]
Short-term Debt [Line Items]
Short-term facility available	$ 10,848		R 159.0	R 150.0	$ 150,000	R 159.0