Revenue Recognition (Revenue Disaggregated By Major Revenue Streams) (Details) $ in Thousands	3 Months Ended
	Sep. 30, 2018 USD ($)
Disaggregation of Revenue [Line Items]
Revenue	$ 125,884
South African Transaction Processing [Member]
Disaggregation of Revenue [Line Items]
Revenue	34,463
International Transaction Processing [Member]
Disaggregation of Revenue [Line Items]
Revenue	39,387
Financial Inclusion And Applied Technologies [Member]
Disaggregation of Revenue [Line Items]
Revenue	52,034
Processing Fees [Member] | South African Transaction Processing [Member]
Disaggregation of Revenue [Line Items]
Revenue	30,229
Processing Fees [Member] | International Transaction Processing [Member]
Disaggregation of Revenue [Line Items]
Revenue	37,244
Welfare Benefit Distributions Fees [Member] | South African Transaction Processing [Member]
Disaggregation of Revenue [Line Items]
Revenue	3,086
Telecom Products And Services [Member] | Financial Inclusion And Applied Technologies [Member]
Disaggregation of Revenue [Line Items]
Revenue	19,147
Account Holder Fees [Member] | Financial Inclusion And Applied Technologies [Member]
Disaggregation of Revenue [Line Items]
Revenue	10,605
Lending Revenue [Member] | Financial Inclusion And Applied Technologies [Member]
Disaggregation of Revenue [Line Items]
Revenue	9,977
Technology Products [Member] | Financial Inclusion And Applied Technologies [Member]
Disaggregation of Revenue [Line Items]
Revenue	4,268
Insurance Revenue [Member] | Financial Inclusion And Applied Technologies [Member]
Disaggregation of Revenue [Line Items]
Revenue	2,515
Other [Member] | South African Transaction Processing [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,148
Other [Member] | International Transaction Processing [Member]
Disaggregation of Revenue [Line Items]
Revenue	2,143
Other [Member] | Financial Inclusion And Applied Technologies [Member]
Disaggregation of Revenue [Line Items]
Revenue	5,522
South Africa [Member]
Disaggregation of Revenue [Line Items]
Revenue	86,497
South Africa [Member] | South African Transaction Processing [Member]
Disaggregation of Revenue [Line Items]
Revenue	34,463
South Africa [Member] | Financial Inclusion And Applied Technologies [Member]
Disaggregation of Revenue [Line Items]
Revenue	52,034
South Africa [Member] | Processing Fees [Member] | South African Transaction Processing [Member]
Disaggregation of Revenue [Line Items]
Revenue	30,229
South Africa [Member] | Welfare Benefit Distributions Fees [Member] | South African Transaction Processing [Member]
Disaggregation of Revenue [Line Items]
Revenue	3,086
South Africa [Member] | Telecom Products And Services [Member] | Financial Inclusion And Applied Technologies [Member]
Disaggregation of Revenue [Line Items]
Revenue	19,147
South Africa [Member] | Account Holder Fees [Member] | Financial Inclusion And Applied Technologies [Member]
Disaggregation of Revenue [Line Items]
Revenue	10,605
South Africa [Member] | Lending Revenue [Member] | Financial Inclusion And Applied Technologies [Member]
Disaggregation of Revenue [Line Items]
Revenue	9,977
South Africa [Member] | Technology Products [Member] | Financial Inclusion And Applied Technologies [Member]
Disaggregation of Revenue [Line Items]
Revenue	4,268
South Africa [Member] | Insurance Revenue [Member] | Financial Inclusion And Applied Technologies [Member]
Disaggregation of Revenue [Line Items]
Revenue	2,515
South Africa [Member] | Other [Member] | South African Transaction Processing [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,148
South Africa [Member] | Other [Member] | Financial Inclusion And Applied Technologies [Member]
Disaggregation of Revenue [Line Items]
Revenue	5,522
South Korea [Member]
Disaggregation of Revenue [Line Items]
Revenue	36,551
South Korea [Member] | International Transaction Processing [Member]
Disaggregation of Revenue [Line Items]
Revenue	36,551
South Korea [Member] | Processing Fees [Member] | International Transaction Processing [Member]
Disaggregation of Revenue [Line Items]
Revenue	34,589
South Korea [Member] | Other [Member] | International Transaction Processing [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,962
Rest Of World [Member]
Disaggregation of Revenue [Line Items]
Revenue	2,836
Rest Of World [Member] | International Transaction Processing [Member]
Disaggregation of Revenue [Line Items]
Revenue	2,836
Rest Of World [Member] | Processing Fees [Member] | International Transaction Processing [Member]
Disaggregation of Revenue [Line Items]
Revenue	2,655
Rest Of World [Member] | Other [Member] | International Transaction Processing [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 181