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Equity-Accounted Investments And Other Long-Term Assets (Narrative) (Details)
R / shares in Units, item in Millions, customer in Millions, SFr in Millions, R in Millions
1 Months Ended 9 Months Ended
Apr. 23, 2018
USD ($)
Apr. 20, 2018
shares
Mar. 31, 2018
ZAR (R)
R / shares
shares
Mar. 09, 2018
ZAR (R)
shares
Feb. 09, 2018
CHF (SFr)
Feb. 09, 2018
USD ($)
Oct. 02, 2017
CHF (SFr)
Oct. 02, 2017
USD ($)
Jul. 27, 2017
ZAR (R)
shares
Jul. 17, 2017
shares
Jul. 13, 2017
ZAR (R)
shares
Jul. 13, 2017
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Aug. 31, 2017
Jun. 30, 2017
USD ($)
Aug. 31, 2016
USD ($)
Mar. 31, 2018
USD ($)
customer
item
Apr. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
shares
Mar. 09, 2018
USD ($)
shares
Aug. 02, 2017
ZAR (R)
shares
Aug. 02, 2017
USD ($)
shares
Jul. 27, 2017
USD ($)
shares
Oct. 07, 2016
ZAR (R)
Oct. 07, 2016
USD ($)
Market value of holding                             $ 27,862,000 [1]       $ 185,023,000            
Acquisition of shares                                 $ 133,431,000                
Exercisable option date         Oct. 02, 2019 Oct. 02, 2019                                      
Available for sale or held to maturity investments                             $ 0       $ 216,739,000            
OneFi [Member]                                                  
Equity-accounted investments, ownership percentage     25.00%                       25.00%       25.00%            
OneFi [Member] | Convertible Debt [Member]                                                  
Maximum borrowing capacity                                     $ 10,000,000            
Outstanding amount                             $ 2,000,000       $ 2,000,000            
OneFi [Member] | Additional [Member] | Convertible Debt [Member] | Subsequent Event [Member]                                                  
Outstanding amount                                   $ 1,000,000              
Finbond [Member]                                                  
Maximum borrowing capacity                                               R 139.2 $ 10,000,000
Investment shares owned | shares     205,483,967                               205,483,967            
Share Price | R / shares     R 4.00                                            
Market value of holding     R 821.9                               $ 69,500,000            
Number of additional shares acquired | shares                     3,600,000 3,600,000                          
Acquisition of shares                                 $ 1,941,000                
Shares received as a capitalization share issue in lieu of a dividend | shares                   4,361,532                              
Equity-accounted investments, ownership percentage     26.00%                       26.00%       26.00%            
Finbond [Member] | Subsequent Event [Member]                                                  
Acquisition of shares $ 261,069,481                                                
Equity-accounted investments, ownership percentage 27.60%                                                
Finbond [Member] | LIBOR [Member]                                                  
Margin added on rate                                 2.31175%                
Finbond [Member] | LIBOR Plus Margin [Member]                                                  
Margin added on rate                                 12.00%                
Finbond [Member] | Additional [Member]                                                  
Acquisition of shares                     R 11.2 $ 800,000                          
Finbond [Member] | Rights Offering [Member] | Subsequent Event [Member]                                                  
Number of additional shares acquired | shares   55,585,514                                              
Cedar Cellular [Member]                                                  
Purchased notes amount                         $ 9,000,000                        
Face value                         $ 20,500,000                        
Equity-accounted investments, ownership percentage     7.625%                       7.625%       7.625%            
Interest rate     8.625%                       8.625%       8.625%            
Maturity date                         Aug. 02, 2022                        
Available for sale or held to maturity investments                                     $ 9,769,000            
Bank Frick [Member]                                                  
Percentage of ownership interest under purchase agreement             30.00% 30.00%                                  
Equity acquisition amount under purchase agreement             SFr 39.8 $ 40,900,000                                  
Bank Frick [Member] | Additional [Member]                                                  
Percentage of ownership interest under purchase agreement             35.00% 35.00%                                  
Equity-accounted investments, ownership percentage         5.00% 5.00%                                      
Cell C [Member] | Cedar Cellular [Member] | Class A [Member]                                                  
Investment shares owned | shares                         59,000,000                        
DNI [Member]                                                  
Ordinary A shares subscribed in strategic investments | shares                 44,999,999                           44,999,999    
Percentage of voting and economic interest under share subscription                 45.00%                                
Subscription of shares, value                 R 945.0                           $ 72,000,000    
DNI [Member] | Additional Payment in Cash Subject to Achievement Of Certain Performance Targets [Member]                                                  
Subscription of shares, value                 R 360.0                           $ 30,400,000    
DNI [Member] | Additional [Member]                                                  
Ordinary A shares subscribed in strategic investments | shares       4,000,000                               4,000,000          
Percentage of voting and economic interest under share subscription     49.00%                                            
Subscription of shares, value       R 89.3                               $ 7,500,000          
DNI [Member] | Scenario, Plan [Member]                                                  
Ordinary A shares subscribed in strategic investments | shares       6,000,000                               6,000,000          
Percentage of voting and economic interest under share subscription       55.00%                                          
Subscription of shares, value       R 126.0                             $ 10,700,000            
MobiKwik [Member]                                                  
Percentage of ownership interest under purchase agreement                             13.50%                    
Premium percentage from issuance of additional shares to new shareholder                           90.00%                      
Percentage of ownership diluted     12.00%                                            
MobiKwik [Member] | Minimum [Member]                                                  
Number of users | customer                                 65                
Number of merchants | item                                 2                
Equity investment acquisition period                                 24 months                
MobiKwik [Member] | Maximum [Member]                                                  
Equity acquisition amount under purchase agreement                                 $ 40,000,000                
Net1 SA [Member] | Cell C [Member] | Class A [Member]                                                  
Investment shares owned | shares     75,000,000                               75,000,000            
Frick Foundation [Member] | Facilitate Development Of Bank Frick's Fintech And Blockchain [Member]                                                  
Contribute amount         SFr 3.8 $ 4,100,000                                      
Frick Foundation [Member] | Bank Frick [Member]                                                  
Equity acquisition amount under purchase agreement         SFr 10.4 $ 11,100,000                                      
Subscription Agreement [Member] | DNI [Member] | Additional [Member]                                                  
Subscription of shares, value     R 380.0                               $ 32,100,000            
Subscription Agreement [Member] | MobiKwik [Member]                                                  
Equity acquisition amount under purchase agreement                             $ 10,600,000 $ 15,000,000                  
Subscription Agreement [Member] | Net1 SA [Member] | Cell C [Member]                                                  
Subscription of shares, value                                         R 2,000.0 $ 151,000,000,000      
Subscription Agreement [Member] | Net1 SA [Member] | Cell C [Member] | Class A [Member]                                                  
Investment shares owned | shares                                         75,000,000 75,000,000      
[1] Derived from audited financial statements