Accumulated Other Comprehensive Loss (Change In Accumulated Other Comprehensive (Loss) Income Per Component) (Details) - USD ($) $ in Thousands			3 Months Ended				9 Months Ended
		Dec. 31, 2019	Mar. 31, 2020		Mar. 31, 2019		Mar. 31, 2020		Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			$ (191,212)		$ (198,374)	[1]	$ (196,046)	[1],[2]	$ (184,538)	[1]
Movement in foreign currency translation reserve related to equity accounted investment			0		0	[1]	2,227		5,430	[1]
Movement in foreign currency translation reserve			(41,212)		(7,872)	[1]	(40,183)		(27,138)	[1]
Ending Balance		$ (191,212)	(218,196)		(200,405)	[1]	(218,196)		(200,405)	[1]
Net1 Korea [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Release of foreign currency translation reserve related to disposal	[1]		14,228				14,228
DNI [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Release of foreign currency translation reserve related to disposal			0		5,841	[1]	0		5,841	[1]
FIHRST [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Release of foreign currency translation reserve related to disposal		(1,578)	0	[1]	0	[1]	1,578	[1]	0	[1]
Accumulated Foreign Currency Translation Reserve [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(191,212)		(198,374)	[1]	(196,046)		(184,538)	[1]
Movement in foreign currency translation reserve related to equity accounted investment							2,227		5,430	[1]
Movement in foreign currency translation reserve			(41,212)		(7,872)	[1]	(40,183)		(27,138)	[1]
Ending Balance		$ (191,212)	(218,196)		(200,405)	[1]	(218,196)		(200,405)	[1]
Accumulated Foreign Currency Translation Reserve [Member] | Net1 Korea [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Release of foreign currency translation reserve related to disposal			$ 14,228				14,228
Accumulated Foreign Currency Translation Reserve [Member] | DNI [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Release of foreign currency translation reserve related to disposal	[1]				$ 5,841				$ 5,841
Accumulated Foreign Currency Translation Reserve [Member] | FIHRST [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Release of foreign currency translation reserve related to disposal							$ 1,578

[1] Refer to Note 1

[2] Derived from audited financial statements.