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Operating Segments (Long-Lived Assets Based On Geographical Location) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived assets $ 377,286 $ 790,473 [1] $ 342,639 [2]
Correction [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived assets   1,976 1,927
South Africa [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived assets 143,924 496,442 [1] 72,443 [2]
South Korea [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived assets 149,390 177,388 [1] 192,473 [2]
Rest Of World [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived assets $ 83,972 $ 116,643 [1] $ 77,723 [2]
[1] The South Africa and total amounts have been restated by $1,976 to correct the misstatement discussed in Note 1.
[2] The South Africa and total amounts have been restated by $1,927 to correct the misstatement discussed in Note 1.