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Borrowings (Summary Of Short-Term Credit Facilities) (Details)
R in Millions, ₩ in Billions
 12 Months Ended
Jun. 30, 2019
ZAR (R)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
 [1]
Jun. 30, 2019
USD ($)
Feb. 04, 2019
USD ($)
Jan. 01, 2019
KRW (₩)
Jan. 01, 2019
USD ($)
Sep. 14, 2018
USD ($)
Short-term Debt [Line Items]                  
Short-term facility available         $ 145,802,000        
Utilized   $ 822,754,000 $ 44,900,000 [1] $ 16,176,000          
Repaid   (740,969,000)              
Foreign currency adjustment [2]   3,205,000              
Balance as of June 30, 2019 [3]   84,990,000              
Overdraft Restricted As To Use For ATM Funding Only [Member]                  
Short-term Debt [Line Items]                  
Short-term facility available         102,954,000        
Balance as of June 30, 2019   75,446,000              
No Restrictions As To Use [Member]                  
Short-term Debt [Line Items]                  
Balance as of June 30, 2019   9,544,000              
Overdraft Facility [Member]                  
Short-term Debt [Line Items]                  
Short-term facility available         32,198,000        
Indirect And Derivative Facilities [Member]                  
Short-term Debt [Line Items]                  
Short-term facility available         10,650,000        
Balance as of June 30, 2018   7,871,000              
Guarantees cancelled   (1,075,000)              
Utilized   46,000              
Foreign currency adjustment [2]   (199,000)              
Balance as of June 30, 2019   6,643,000 7,871,000            
South Africa [Member] | Amended July 2017 [Member]                  
Short-term Debt [Line Items]                  
Short-term facility available         85,203,000        
Utilized   722,375,000              
Repaid   (655,612,000)              
Foreign currency adjustment [2]   2,803,000              
Balance as of June 30, 2019 [3]   69,566,000              
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         85,203,000        
Balance as of June 30, 2019   69,566,000              
South Africa [Member] | Nedbank Limited [Member]                  
Short-term Debt [Line Items]                  
Short-term facility available         31,951,000        
Utilized   85,843,000              
Repaid   (80,365,000)              
Foreign currency adjustment [2]   402,000              
Balance as of June 30, 2019 [3]   5,880,000              
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         17,751,000        
Balance as of June 30, 2019   5,880,000              
South Africa [Member] | Nedbank Limited [Member] | Overdraft Facility [Member]                  
Short-term Debt [Line Items]                  
Short-term facility available         3,550,000        
Total overdraft facilities withdrawn   8,600,000              
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 250.0       17,800,000        
Utilized 82.8 5,900,000              
South Africa [Member] | Nedbank Limited [Member] | Overdraft Facility [Member] | Nedbank Short-Term Credit Facility [Member]                  
Short-term Debt [Line Items]                  
Short-term facility available R 300.0       21,300,000        
Total overdraft facilities withdrawn   8,600,000              
South Africa [Member] | Nedbank Limited [Member] | Indirect And Derivative Facilities [Member]                  
Short-term Debt [Line Items]                  
Short-term facility available         10,650,000        
Balance as of June 30, 2018   7,871,000              
Guarantees cancelled   (1,075,000)              
Utilized   46,000              
Foreign currency adjustment [2]   (199,000)              
Balance as of June 30, 2019   6,643,000 $ 7,871,000            
United States [Member] | Bank Frick [Member]                  
Short-term Debt [Line Items]                  
Short-term facility available         20,000,000        
Utilized   14,536,000              
Repaid   (4,992,000)              
Balance as of June 30, 2019 [3]   9,544,000              
United States [Member] | Bank Frick [Member] | No Restrictions As To Use [Member]                  
Short-term Debt [Line Items]                  
Balance as of June 30, 2019   9,544,000              
United States [Member] | Bank Frick [Member] | Overdraft Facility [Member]                  
Short-term Debt [Line Items]                  
Short-term facility available         20,000,000 $ 20,000,000      
Utilized   9,500,000              
United States [Member] | Bank Frick [Member] | Renewed [Member] | Overdraft Facility [Member]                  
Short-term Debt [Line Items]                  
Short-term facility available                 $ 10,000,000
South Korea [Member] | Hana Bank [Member]                  
Short-term Debt [Line Items]                  
Short-term facility available         8,648,000        
South Korea [Member] | Hana Bank [Member] | Overdraft Facility [Member]                  
Short-term Debt [Line Items]                  
Short-term facility available         $ 8,648,000   ₩ 10 $ 8,600,000  
Utilized   $ 0              
[1] Certain amounts have been restated to correct the misstatement discussed in Note 1.
[2] Represents the effects of the fluctuations between the ZAR and the U.S. dollar.
[3] Nedbank as of June 30, 2019, of $5.9 million comprises the net of total overdraft facilities withdrawn of $8.6 million offset against funds in bank accounts with Nedbank of $2.7 million.