Goodwill And Intangible Assets, Net (Narrative) (Details)	3 Months Ended		9 Months Ended
	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2019 USD ($) item	Mar. 31, 2018 USD ($)
Impairment of intangible asset	$ 5,300,000		$ 5,300,000
Impairment of goodwill	0		$ (8,191,000)
Percentage of towers contructed by Cell C			22.00%
Amortization expense	$ 6,100,000	$ 3,000,000	$ 18,300,000	$ 8,800,000
DNI [Member]
Number of towers expected to be contructed by Cell C | item			1,000
International Transaction Processing [Member]
Impairment of goodwill		$ (19,900,000)	$ (7,011,000)	$ (19,900,000)
South African Transaction Processing [Member]
Impairment of goodwill			$ (1,180,000)