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Common Stock (Narrative) (Details)
ZAR / shares in Units, $ in Thousands, ZAR in Millions
 12 Months Ended
Jun. 06, 2014
shares
Jun. 05, 2014
ZAR / shares
Apr. 16, 2014
shares
Dec. 06, 2013
ZAR / shares
shares
Oct. 10, 2013
item
Jun. 30, 2015
ZAR
item
ZAR / shares
shares
Jun. 30, 2015
USD ($)
item
shares
Jun. 30, 2014
USD ($)
shares
Jun. 30, 2015
USD ($)
Jun. 04, 2014
ZAR / shares
Class of Stock [Line Items]                    
Number of votes per common share | item           1 1      
Stock repurchase program, authorized amount                 $ 100,000  
Treasury shares acquired, value             $ 9,151 $ 24,858    
Treasury shares acquired, shares | shares               2,428,122    
Common stock price per share | ZAR / shares                   ZAR 120.00
Share price benchmark, entire outstanding principal amount is required due | ZAR / shares           ZAR 120.00        
Share price benchmark, trigger event for repurchase of shares | ZAR / shares           ZAR 60.00        
Failed arbitration, trigger event, days           7 days 7 days      
Period of trading days to the trigger events           30 days 30 days      
Common stock repurchase per share | ZAR / shares   ZAR 109.98                
Restricted resale period from date of issuance           5 years 5 years      
Gain (loss) from non-controlling interests             $ 1,407      
KSNET [Member]                    
Class of Stock [Line Items]                    
Business acquisition, cost of acquired entity, cash paid             $ 2,000      
Difference in amount, fair value of consideration paid and non-controlling interest adjustment               $ 1,500    
Gain (loss) from non-controlling interests               $ 0    
Common Stock [Member]                    
Class of Stock [Line Items]                    
Treasury shares acquired, shares | shares           0 0 0    
Black Economic Empowerment [Member]                    
Class of Stock [Line Items]                    
Loan agreement term, in years           5 years 5 years      
Basis points added to rate           3.00% 3.00%      
Percent of outstanding principal amount due for first and second payments           10.00% 10.00%      
Number of transactions | item         2          
Percent of outstanding principal amount due for third and fourth payments           15.00% 15.00%      
Black Economic Empowerment [Member] | Common Stock [Member]                    
Class of Stock [Line Items]                    
Treasury shares acquired, shares | shares 2,400,000                  
Number of shares, issued | shares     4,400,000 4,400,000            
Common stock price per share | ZAR / shares       ZAR 60.00            
Calculated percentage of the closing price of common stock       75.00%            
Percentage of discount       25.00%            
Business Venture Investment [Member]                    
Class of Stock [Line Items]                    
Treasury shares acquired, value           ZAR 97.4 $ 9,200      
Treasury shares acquired, shares | shares           1,837,432 1,837,432      
Cash Paymaster Services [Member]                    
Class of Stock [Line Items]                    
Percent of subscription shares           12.50% 12.50%      
Subscription of shares, value           ZAR 15.0     $ 1,400