Revenue Recognition (Revenue Disaggregated By Major Revenue Streams) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Mar. 31, 2019	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 86,484	$ 309,518
South African Transaction Processing [Member]
Disaggregation of Revenue [Line Items]
Revenue	16,074	71,340
International Transaction Processing [Member]
Disaggregation of Revenue [Line Items]
Revenue	34,358	111,869
Financial Inclusion And Applied Technologies [Member]
Disaggregation of Revenue [Line Items]
Revenue	36,052	126,309
Processing Fees [Member] | South African Transaction Processing [Member]
Disaggregation of Revenue [Line Items]
Revenue	14,166	63,426
Processing Fees [Member] | International Transaction Processing [Member]
Disaggregation of Revenue [Line Items]
Revenue	33,020	107,189
Welfare Benefit Distribution 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	17,409	54,576
Account Holder Fees [Member] | Financial Inclusion And Applied Technologies [Member]
Disaggregation of Revenue [Line Items]
Revenue	2,445	16,190
Lending Revenue [Member] | Financial Inclusion And Applied Technologies [Member]
Disaggregation of Revenue [Line Items]
Revenue	6,075	22,021
Technology Products [Member] | Financial Inclusion And Applied Technologies [Member]
Disaggregation of Revenue [Line Items]
Revenue	5,357	15,396
Insurance Revenue [Member] | Financial Inclusion And Applied Technologies [Member]
Disaggregation of Revenue [Line Items]
Revenue	755	4,580
Other [Member] | South African Transaction Processing [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,908	4,828
Other [Member] | International Transaction Processing [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,338	4,680
Other [Member] | Financial Inclusion And Applied Technologies [Member]
Disaggregation of Revenue [Line Items]
Revenue	4,011	13,546
South Africa [Member]
Disaggregation of Revenue [Line Items]
Revenue	52,126	197,649
South Africa [Member] | South African Transaction Processing [Member]
Disaggregation of Revenue [Line Items]
Revenue	16,074	71,340
South Africa [Member] | Financial Inclusion And Applied Technologies [Member]
Disaggregation of Revenue [Line Items]
Revenue	36,052	126,309
South Africa [Member] | Processing Fees [Member] | South African Transaction Processing [Member]
Disaggregation of Revenue [Line Items]
Revenue	14,166	63,426
South Africa [Member] | Welfare Benefit Distribution 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	17,409	54,576
South Africa [Member] | Account Holder Fees [Member] | Financial Inclusion And Applied Technologies [Member]
Disaggregation of Revenue [Line Items]
Revenue	2,445	16,190
South Africa [Member] | Lending Revenue [Member] | Financial Inclusion And Applied Technologies [Member]
Disaggregation of Revenue [Line Items]
Revenue	6,075	22,021
South Africa [Member] | Technology Products [Member] | Financial Inclusion And Applied Technologies [Member]
Disaggregation of Revenue [Line Items]
Revenue	5,357	15,396
South Africa [Member] | Insurance Revenue [Member] | Financial Inclusion And Applied Technologies [Member]
Disaggregation of Revenue [Line Items]
Revenue	755	4,580
South Africa [Member] | Other [Member] | South African Transaction Processing [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,908	4,828
South Africa [Member] | Other [Member] | Financial Inclusion And Applied Technologies [Member]
Disaggregation of Revenue [Line Items]
Revenue	4,011	13,546
South Korea [Member]
Disaggregation of Revenue [Line Items]
Revenue	32,056	104,007
South Korea [Member] | International Transaction Processing [Member]
Disaggregation of Revenue [Line Items]
Revenue	32,056	104,007
South Korea [Member] | Processing Fees [Member] | International Transaction Processing [Member]
Disaggregation of Revenue [Line Items]
Revenue	30,895	99,866
South Korea [Member] | Other [Member] | International Transaction Processing [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,161	4,141
Rest Of World [Member]
Disaggregation of Revenue [Line Items]
Revenue	2,302	7,862
Rest Of World [Member] | International Transaction Processing [Member]
Disaggregation of Revenue [Line Items]
Revenue	2,302	7,862
Rest Of World [Member] | Processing Fees [Member] | International Transaction Processing [Member]
Disaggregation of Revenue [Line Items]
Revenue	2,125	7,323
Rest Of World [Member] | Other [Member] | International Transaction Processing [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 177	$ 539