Property, Plant And Equipment, Net (Schedule Of Property Plant And Equipment Net) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 30, 2017
Property, Plant and Equipment [Line Items]
Cost	$ 156,239	$ 159,623
Accumulated depreciation	129,185	120,212
Carrying amount	27,054	39,411	[1]
Land [Member]
Property, Plant and Equipment [Line Items]
Cost	880	858
Accumulated depreciation
Carrying amount	880	858
Building And Structures [Member]
Property, Plant and Equipment [Line Items]
Cost	483	471
Accumulated depreciation	193	171
Carrying amount	290	300
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Cost	125,241	131,589
Accumulated depreciation	104,185	97,475
Carrying amount	21,056	34,114
Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Cost	9,438	8,769
Accumulated depreciation	7,221	6,804
Carrying amount	2,217	1,965
Vehicles [Member]
Property, Plant and Equipment [Line Items]
Cost	20,197	17,936
Accumulated depreciation	17,586	15,762
Carrying amount	$ 2,611	$ 2,174

[1] Refer to Note 1.