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Fair Value Of Financial Instruments (Narrative) (Details)
3 Months Ended 9 Months Ended
Mar. 31, 2021
USD ($)
shares
Mar. 31, 2020
USD ($)
Mar. 31, 2021
USD ($)
shares
Mar. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Derivatives, Fair Value [Line Items]          
Fair value measurement asset transfers into Level 3 $ 0 $ 0 $ 0 $ 0  
Fair value measurement asset transfers out of Level 3 0 0 0 0  
Transfers into or out of Level 3 $ 0 $ 0 $ 0 $ 0  
Foreign Exchange Contracts [Member]          
Derivatives, Fair Value [Line Items]          
Outstanding foreign exchange contracts 0   0   0
Cell C [Member]          
Derivatives, Fair Value [Line Items]          
Investment amount owned $ 0.0   $ 0.0   $ 0.0
Equity method investment, percentage of ownership interest 0.00%   0.00%    
Cell C [Member] | Net1 SA [Member] | Class A [Member]          
Derivatives, Fair Value [Line Items]          
Investment shares owned | shares 75,000,000   75,000,000