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Income Taxes (Narrative) (Details) - USD ($)
12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Valuation Allowance [Line Items]        
Statutory income tax rate 21.00%      
Unrecognized tax benefit   $ 0 $ 0  
Income tax expense $ 7,560,000 2,656,000 [1] (5,072,000) [1]  
Loss before income tax (5,619,000) (65,016,000) [1] (319,443,000) [1]  
Foreign tax credits generated-United States 10,000 72,000 $ (944,000)  
Capital gains related to disposal of FIHRST and sale of DNI reduced by utilizing capital loss carryforwards   0    
Deferred tax assets $ 747,000 $ 478,000    
Effective tax rate (134.55%) (4.09%) 1.59%  
Changes in enacted tax rate   $ 0 $ 0 $ 0
Valuation allowance $ 118,777,000 $ 106,433,000    
Additional [Member]        
Valuation Allowance [Line Items]        
Foreign tax credits generated-United States     1,100,000  
Tax Cuts And Jobs Act [Member]        
Valuation Allowance [Line Items]        
Transition tax liability after generated foreign tax credits     $ 56,900,000 $ 55,800,000
South Africa [Member]        
Valuation Allowance [Line Items]        
Statutory income tax rate 28.00% 28.00% 28.00%  
Loss before income tax $ (30,825,000) $ (26,230,000) $ (273,265,000)  
Cell C [Member]        
Valuation Allowance [Line Items]        
Fair value of investment   0.0    
CPS [Member]        
Valuation Allowance [Line Items]        
Fair value of investment   $ 0.0    
[1] <div>Certain amounts have been restated to correct the misstatement discussed in Note 1.</div>