Borrowings (Summary Of Short-Term Credit Facilities) (Details) $ in Thousands, R in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2021 USD ($)	Mar. 31, 2021 ZAR (R)	Mar. 31, 2020 USD ($)	Mar. 31, 2021 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	$ 111,887		$ 111,887
Utilized	55,280	$ 193,723	261,759		$ 585,273
Overdraft Restricted As To Use For ATM Funding Only [Member]
Short-term Debt [Line Items]
Short-term facility available	97,789		97,789
Overdraft Facility [Member]
Short-term Debt [Line Items]
Short-term facility available	3,372		3,372
Balance as of June 30, 2020			14,814
Utilized			261,759
Repaid			(268,303)
Foreign currency adjustment			3,125
Balance as of March 31, 2021	11,395		11,395
Overdraft Facility [Member] | Overdraft Restricted As To Use For ATM Funding Only [Member]
Short-term Debt [Line Items]
Balance as of March 31, 2021	11,395		11,395
Indirect And Derivative Facilities [Member]
Short-term Debt [Line Items]
Short-term facility available	10,726		10,726
Balance as of June 30, 2020			5,398
Foreign currency adjustment			1,251
Balance as of March 31, 2021	10,558		10,558
Nedbank Limited [Member] | Overdraft Facility [Member]
Short-term Debt [Line Items]
Short-term facility available	20,200		20,200			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	16,900		16,900			250.0
Nedbank Limited [Member] | Indirect And Derivative Facilities [Member]
Short-term Debt [Line Items]
Short-term facility available	10,700		10,700			R 159.0
South Africa [Member] | Indirect And Derivative Facilities [Member]
Short-term Debt [Line Items]
Utilized			3,909
South Africa [Member] | Amended July 2017 [Member] | Overdraft Facility [Member] | Overdraft Restricted As To Use For ATM Funding Only [Member]
Short-term Debt [Line Items]
Balance as of March 31, 2021	$ 10,519		$ 10,519
South Africa [Member] | Nedbank Limited [Member] | Prime Rate [Member]
Short-term Debt [Line Items]
Debt instrument, interest rate	5.85%		5.85%			5.85%
Percentage used to calculate interest rate on short-term facilities	1.15%		1.15%			1.15%
South Africa [Member] | Nedbank Limited [Member] | Overdraft Restricted As To Use For ATM Funding Only [Member]
Short-term Debt [Line Items]
Short-term facility available	$ 16,860		$ 16,860
South Africa [Member] | Nedbank Limited [Member] | Overdraft Facility [Member]
Short-term Debt [Line Items]
Short-term facility available	3,372		3,372
Balance as of June 30, 2020			58
Utilized			17,525
Repaid			(16,401)
Foreign currency adjustment			(306)
Balance as of March 31, 2021	876		876
South Africa [Member] | 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	30,958		30,958
Balance as of March 31, 2021	876		876
South Africa [Member] | Nedbank Limited [Member] | Indirect And Derivative Facilities [Member]
Short-term Debt [Line Items]
Short-term facility available	10,726		10,726				R 159.0	R 150.0	$ 150,000	R 159.0
Balance as of June 30, 2020			5,398
Utilized			3,909
Foreign currency adjustment			1,251
Balance as of March 31, 2021	10,558		10,558
South Africa [Member] | Nedbank Limited [Member] | Indirect And Derivative Facilities [Member] | Nedbank Short-Term Credit Facility [Member]
Short-term Debt [Line Items]
Balance as of June 30, 2020			5,400	R 93.6
Balance as of March 31, 2021	10,600		10,600	R 156.6
South Africa [Member] | RMB [Member]
Short-term Debt [Line Items]
Short-term facility available	$ 80,929		$ 80,929
South Africa [Member] | RMB [Member] | Prime Rate [Member]
Short-term Debt [Line Items]
Debt instrument, interest rate	7.00%		7.00%			7.00%
South Africa [Member] | RMB [Member] | Overdraft Restricted As To Use For ATM Funding Only [Member]
Short-term Debt [Line Items]
Short-term facility available	$ 80,929		$ 80,929
South Africa [Member] | RMB [Member] | Overdraft Facility [Member]
Short-term Debt [Line Items]
Short-term facility available	0		0
Balance as of June 30, 2020			14,756
Utilized			244,234
Repaid			(251,902)
Foreign currency adjustment			3,431
Balance as of March 31, 2021	10,519		10,519
South Africa [Member] | RMB [Member] | Indirect And Derivative Facilities [Member]
Short-term Debt [Line Items]
Short-term facility available	0		0
Balance as of June 30, 2020			0
Utilized			0
Foreign currency adjustment			0
Balance as of March 31, 2021	$ 0		$ 0