Operating Segments (Revenue Based On Geographic Location) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 149,194	$ 162,721	$ 148,416	$ 152,558	$ 155,056	$ 147,944	$ 151,433	$ 155,633	$ 612,889	$ 610,066	$ 590,749
South Africa [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									433,421	434,124	422,022
South Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									153,314	153,403	158,609
Rest Of World [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									$ 26,154	$ 22,539	$ 10,118