Equity-Accounted Investments And Other Long-Term Assets (Summary Of Unrealized Gain (Loss) On Investments) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Mar. 31, 2019	Jun. 30, 2018
Schedule Of Equity And Held To Maturity Investments [Line Items]
Cost basis	$ 33,985	$ 10,395
Carrying value	33,985	10,395
MobiKwik [Member]
Schedule Of Equity And Held To Maturity Investments [Line Items]
Cost basis	26,993
Carrying value	26,993
Cedar Cellular [Member]
Schedule Of Equity And Held To Maturity Investments [Line Items]
Cost basis	6,992	10,395
Carrying value	$ 6,992	$ 10,395