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Fair Value Of Financial Instruments And Equity-Accounted Investments (Narrative) (Details) (USD $)
3 Months Ended 9 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Mar. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Significant fluctuation of US Dollar to ZAR exchange rate, in years     2 years  
Transfers in or out of Level 3 $ 0 $ 0 $ 0 $ 0
Impairment charges 0 0 0 0
Nonrecurring [Member]
       
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Liabilities $ 0   $ 0  
Finbond [Member]
       
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity method investment, shares 156,788,712   156,788,712  
Fair value of securities representing percentage of total assets, percent 1.00%   1.00%