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Equity Instruments Issued Pursuant To BEE Transactions (Details) - 2014 Transaction [Member] - USD ($)
$ in Millions
12 Months Ended
Apr. 16, 2014
Jun. 30, 2015
Business Acquisition, Equity Interests Issued or Issuable [Line Items]    
Expected volatility rate   21.04%
Risk free rate   7.90%
Expected term, in years   5 years
Estimated expected volatility calculation period, in days   30 days
Common Stock [Member]    
Business Acquisition, Equity Interests Issued or Issuable [Line Items]    
Number of shares, issued 4,400,000  
Fair value of option $ 11.3