Segment information - Schedule of Long-Lived Assets by Geographical Location (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information [Line Items]
Long-lived assets	$ 97,168	$ 85,704
South Africa
Segment Reporting Information [Line Items]
Long-lived assets	75,621	63,832
Europe
Segment Reporting Information [Line Items]
Long-lived assets	10,161	10,366
America
Segment Reporting Information [Line Items]
Long-lived assets	5,192	5,178
Middle East and Australia
Segment Reporting Information [Line Items]
Long-lived assets	5,099	5,474
Brazil
Segment Reporting Information [Line Items]
Long-lived assets	$ 1,095	$ 854