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Property, Plant And Equipment, Net (Schedule Of Property Plant And Equipment Net) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Jun. 30, 2018
Property, Plant and Equipment [Line Items]    
Cost $ 136,420 $ 151,763
Accumulated depreciation 117,866 126,026
Carrying amount 18,554 25,737 [1]
Land [Member]    
Property, Plant and Equipment [Line Items]    
Cost 849 880
Accumulated depreciation
Carrying amount 849 880
Building And Structures [Member]    
Property, Plant and Equipment [Line Items]    
Cost 419 483
Accumulated depreciation 158 193
Carrying amount 261 290
Computer Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Cost 109,217 124,160
Accumulated depreciation 94,988 103,297
Carrying amount 14,229 20,863
Furniture And Office Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Cost 9,788 8,886
Accumulated depreciation 7,738 6,933
Carrying amount 2,050 1,953
Motor Vehicles [Member]    
Property, Plant and Equipment [Line Items]    
Cost 16,147 17,354
Accumulated depreciation 14,982 15,603
Carrying amount $ 1,165 $ 1,751
[1] Certain amounts have been restated to correct the misstatement discussed in Note 1.