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Income Taxes (Narrative) (Details) - USD ($)
12 Months Ended
Jan. 01, 2018
Dec. 22, 2017
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Valuation Allowance [Line Items]          
Statutory income tax rate 21.00% 35.00%      
Difference in transition tax before foreign tax credits     $ 1,100,000    
Transition tax liability after generated foreign tax credits         $ 0
Accrued interest related to uncertain tax positions     100,000 $ 100,000  
Unrecognized tax benefit     1,200,000 $ 800,000  
Blended tax rate       28.10%  
Income tax expense     3,725,000 $ 48,597,000 [1] 42,506,000 [1]
Income before income tax     (303,026,000) [2] 100,366,000 [1] 114,456,000 [1]
Foreign tax credits generated-United States     (944,000) (55,778,000) $ (3,345,000)
Deferred tax assets     2,255,000 8,973,000  
Unused foreign tax credits     0 0  
Valuation allowance, indirect foreign tax credits     881,000    
Changes in enacted tax rate       309,000  
Accrued penalties related to uncertain tax positions     200,000 200,000  
Cell C [Member]          
Valuation Allowance [Line Items]          
Fair value of capital losses related to investments     0    
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  
Additional valuation allowance       600,000  
Changes in enacted tax rate       $ 300,000  
South Africa [Member]          
Valuation Allowance [Line Items]          
Statutory income tax rate 28.00%   28.00% 28.00% 28.00%
Income before income tax     $ (267,637,000) $ 131,366,000 $ 129,786,000
South Korea [Member]          
Valuation Allowance [Line Items]          
Statutory income tax rate 22.00%        
Foreign Tax Credits [Member]          
Valuation Allowance [Line Items]          
Foreign tax credits generated-United States       $ 65,300,000  
Valuation allowance, indirect foreign tax credits        
[1] Certain amounts have been restated to correct the misstatement discussed in Note 1.
[2] Operating loss: Corporate/Eliminations includes $34.0 million related to the accrual referred to in Note 13.