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Long-Term Borrowings (Narrative) (Details)
₩ in Billions
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 29, 2018
ZAR (R)
Jun. 29, 2018
USD ($)
Mar. 09, 2018
ZAR (R)
Mar. 09, 2018
USD ($)
Mar. 08, 2018
ZAR (R)
Oct. 20, 2017
USD ($)
Sep. 29, 2017
item
Jul. 29, 2017
KRW (₩)
Jul. 29, 2017
USD ($)
Jul. 26, 2017
ZAR (R)
Jul. 26, 2017
USD ($)
Mar. 31, 2018
ZAR (R)
Mar. 31, 2018
USD ($)
Aug. 31, 2017
ZAR (R)
Aug. 31, 2017
USD ($)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2018
ZAR (R)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Mar. 09, 2018
USD ($)
South Africa [Member] | Facilities Agreement [Member]                                          
Debt Instrument [Line Items]                                          
Maximum borrowing capacity         R 210,000,000               $ 17,800,000     $ 17,800,000     $ 17,800,000    
Outstanding amount                         75,500,000     75,500,000     75,500,000    
Facilities fees paid                       R 2,400,000 $ 200,000 R 6,300,000 $ 600,000            
Interest expense                               1,900,000     5,500,000    
Amortization of fees, prepaid facility                               100,000     300,000    
Maturity date         Mar. 31, 2020                                
South Africa [Member] | Cell C [Member]                                          
Debt Instrument [Line Items]                                          
Percentage acquired in acquisition                   15.00% 15.00%                    
South Africa [Member] | Cell C [Member] | Facilities Agreement [Member]                                          
Debt Instrument [Line Items]                                          
Amount utilized from revolving credit facility                   R 1,250,000,000 $ 92,200,000                    
Repayment of facilities                                   R 562,500,000 44,400,000    
Number of quarter installments | item             12                            
South Africa [Member] | Cell C [Member] | Facilities Agreement [Member] | Forecast [Member]                                          
Debt Instrument [Line Items]                                          
Scheduled principal payment R 213,800,000 $ 18,100,000                                      
South Africa [Member] | Cell C [Member] | Unable To Acquire 6% In DNI [Member] | Facilities Agreement [Member] | Forecast [Member]                                          
Debt Instrument [Line Items]                                          
Scheduled principal payment R 324,000,000 $ 27,400,000                                      
South Africa [Member] | DNI [Member] | Facilities Agreement [Member]                                          
Debt Instrument [Line Items]                                          
Amount utilized from revolving credit facility     R 84,000,000 $ 7,100,000                                  
Percentage acquired in acquisition     4.00%                                   4.00%
Loan amount     R 126,000,000                                   $ 10,600,000
South Africa [Member] | JIBAR [Member] | Facilities Agreement [Member]                                          
Debt Instrument [Line Items]                                          
Margin added on rate         2.75%                                
South Africa [Member] | JIBAR [Member] | Facilities Agreement [Member] | Forecast [Member]                                          
Debt Instrument [Line Items]                                          
Interest rate 6.867% 6.867%                                      
South Korea [Member]                                          
Debt Instrument [Line Items]                                          
Interest expense                               300,000 $ 300,000   400,000 $ 900,000  
Amortization of fees, prepaid facility                               $ 30,000 $ 30,000   $ 100,000 $ 90,000  
South Korea [Member] | Facility C [Member]                                          
Debt Instrument [Line Items]                                          
Amount utilized from revolving credit facility               ₩ 0.3 $ 300,000                        
South Korea [Member] | Korean Senior Secured Loan Facility [Member]                                          
Debt Instrument [Line Items]                                          
Repayment of facilities           $ 16,600,000