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Borrowings (Summary Of Short-Term Credit Facilities) (Details)
R in Millions
 12 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2021
ZAR (R)
Feb. 04, 2019
USD ($)
Sep. 14, 2018
USD ($)
Short-term Debt [Line Items]            
Utilized $ 360,083,000 $ 689,763,000 $ 822,754,000      
Overdraft Restricted As To Use For ATM Funding Only [Member]            
Short-term Debt [Line Items]            
Short-term facility available 101,391,000          
Balance as of September 30, 2019 14,245,000          
Overdraft Facility [Member]            
Short-term Debt [Line Items]            
Short-term facility available 112,338,000          
Balance as of June 30, 2019 14,814,000 84,990        
Utilized 360,083,000 689,763,000        
Repaid (365,440,000) (747,935,000)        
Foreign currency adjustment 4,788,000 (12,004,000)        
Balance as of September 30, 2019 14,245,000 14,814,000 84,990      
Overdraft Facility [Member] | Overdraft Restricted As To Use For ATM Funding Only [Member]            
Short-term Debt [Line Items]            
Balance as of June 30, 2019 14,814,000          
Balance as of September 30, 2019   14,814,000        
Overdraft Facility [Member] | No Restrictions As To Use [Member]            
Short-term Debt [Line Items]            
Balance as of June 30, 2019 0          
Balance as of September 30, 2019   0        
Indirect And Derivative Facilities [Member]            
Short-term Debt [Line Items]            
Short-term facility available 10,947,000          
Balance as of June 30, 2019 5,398,000 6,643,000        
Utilized 4,009          
Foreign currency adjustment 1,540,000 (1,245,000)        
Balance as of September 30, 2019 10,947,000 5,398,000 6,643,000      
South Africa [Member] | Amended July 2017 [Member] | Overdraft Restricted As To Use For ATM Funding Only [Member]            
Short-term Debt [Line Items]            
Short-term facility available 83,910,000          
Balance as of September 30, 2019 14,245,000          
South Africa [Member] | Amended July 2017 [Member] | Overdraft Facility [Member]            
Short-term Debt [Line Items]            
Short-term facility available 83,910,000          
Balance as of June 30, 2019 14,756,000 69,566        
Utilized 340,655,000 603,134,000        
Repaid (346,187,000) (647,990,000)        
Foreign currency adjustment 5,021,000 (9,954,000)        
Balance as of September 30, 2019 14,245,000 14,756,000 69,566      
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 June 30, 2019 14,756,000          
Balance as of September 30, 2019   14,756,000        
South Africa [Member] | Amended July 2017 [Member] | Overdraft Facility [Member] | No Restrictions As To Use [Member]            
Short-term Debt [Line Items]            
Balance as of June 30, 2019 0          
Balance as of September 30, 2019   0        
South Africa [Member] | Amended July 2017 [Member] | Indirect And Derivative Facilities [Member]            
Short-term Debt [Line Items]            
Short-term facility available 0          
Balance as of June 30, 2019 0 0        
Utilized 0          
Foreign currency adjustment 0 0        
Balance as of September 30, 2019 0 0 0      
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 17,481,000          
Balance as of September 30, 2019 0          
South Africa [Member] | Nedbank Limited [Member] | Overdraft Facility [Member]            
Short-term Debt [Line Items]            
Short-term facility available 17,500,000     R 250.0    
Balance as of June 30, 2019 58,000 5,880        
Utilized 19,428,000 69,245,000        
Repaid (19,253,000) (73,017,000)        
Foreign currency adjustment (233,000) (2,050,000)        
Balance as of September 30, 2019 0 58,000 5,880      
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 | R       R 250.0    
Balance as of June 30, 2019 58,000          
Balance as of September 30, 2019   58,000        
Total overdraft facilities withdrawn 200,000 0        
South Africa [Member] | Nedbank Limited [Member] | Overdraft Facility [Member] | No Restrictions As To Use [Member]            
Short-term Debt [Line Items]            
Balance as of June 30, 2019 0          
Balance as of September 30, 2019   0        
South Africa [Member] | Nedbank Limited [Member] | Indirect And Derivative Facilities [Member]            
Short-term Debt [Line Items]            
Short-term facility available 10,947,000          
Balance as of June 30, 2019 5,398,000 6,643,000        
Utilized 4,009,000          
Foreign currency adjustment 1,540,000 (1,245,000)        
Balance as of September 30, 2019 10,947,000 5,398,000 6,643,000      
United States [Member] | Bank Frick [Member] | Overdraft Facility [Member]            
Short-term Debt [Line Items]            
Balance as of June 30, 2019 0 9,544        
Utilized   17,384,000        
Repaid   (26,928,000)        
Foreign currency adjustment   0        
Balance as of September 30, 2019   0 9,544      
United States [Member] | Bank Frick [Member] | Indirect And Derivative Facilities [Member]            
Short-term Debt [Line Items]            
Balance as of September 30, 2019 $ 0          
United States [Member] | Bank Frick [Member] | Renewed [Member] | Overdraft Facility [Member]            
Short-term Debt [Line Items]            
Short-term facility available         $ 20,000,000.0 $ 10,000,000.0
Balance as of June 30, 2019   $ 9,500,000        
Balance as of September 30, 2019     $ 9,500,000