Debt - Schedule of Undrawn Facilities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Mar. 31, 2021
Line of Credit Facility [Line Items]
Undrawn borrowing remaining	$ 4,969	$ 5,532
Standard Bank Limited | Overdraft
Line of Credit Facility [Line Items]
Percentage deducted from interest rate	1.20%	1.20%
Undrawn borrowing remaining	$ 2,093	$ 2,616
Standard Bank Limited | Vehicle and asset finance
Line of Credit Facility [Line Items]
Percentage deducted from interest rate	1.20%	1.20%
Undrawn borrowing remaining	$ 562	$ 570
Standard Bank Limited | Working capital facility
Line of Credit Facility [Line Items]
Percentage deducted from interest rate	0.25%	0.25%
Undrawn borrowing remaining	$ 1,653	$ 1,676
Nedbank Limited | Overdraft
Line of Credit Facility [Line Items]
Percentage deducted from interest rate	2.00%	2.00%
Undrawn borrowing remaining	$ 661	$ 670