Summary of significant accounting policies (Tables)

12 Months Ended

Mar. 31, 2022

Schedule of Cumulative Currency Translation Adjustments

The movement in the foreign currency translation adjustments is as follows (in thousands):


	As of March 31,
	2021		2022

Cumulative foreign currency translation adjustments, beginning of year	$	(11,070)	$	1,924

Foreign currency translation gains for the year, net of tax	12,994		1,985
Cumulative foreign currency translation adjustments, end of year	$	1,924	$	3,909

Schedule of Property and Equipment

Depreciation is calculated using the straight-line method to reduce the cost of the asset to its residual value over its estimated useful life, as follows:



Plant and equipment			1 - 8 years
Motor vehicles			3 - 7 years
Furniture, fixtures and equipment			1 - 10 years
Computer and radio equipment			1 - 7 years
In-vehicle devices installed			1 - 8 years

The cost and accumulated depreciation of owned assets are as follows (in thousands):


	As of March 31,
	2021		2022
Owned assets

Plant and equipment	719		791
Motor vehicles	993		1,938
Furniture, fixtures and equipment	1,519		1,553
Computer and radio equipment	3,639		4,036
In-vehicle devices	53,448		65,881
Assets in progress	7		332
Owned assets, gross	60,325		74,531
Less: accumulated depreciation and impairments	(42,955)		(46,597)

Owned assets, net	$	17,370	$	27,934

Goodwill Allocation and Sensitivity by Reporting Unit

The allocation of goodwill to reporting units is as follows (in thousands):


	As of March 31,
	2021		2022
Central Services Organization	$	6,913	$	7,116
Europe	8,993		8,591
Middle East and Australasia	4,364		4,365
Africa	23,668		24,362
	$	43,938	$	44,434

Sensitivity of goodwill to impairment as of March 31, 2022 was as follows:


	Central Services Organization		Africa		Europe		Middle East and Australasia
Fair value of reporting unit exceeded its carrying amount by	315.7	%	321.0	%	33.7	%	300.9	%
Post-tax discount rate used to determine fair value	14.6	%	14.6	%	10.8	%	8.4	%
Growth rate used to extrapolate cash flow beyond the budget period	4.6	%	4.6	%	3.4	%	2.5	%
The following mutually exclusive changes will result in nil headroom
Post-tax discount rate applied to the expected cash flow projections	32.5	%	39.2	%	13.1	%	27.3	%
Decrease in the cash flow projections of	75.9	%	76.2	%	25.2	%	75.1	%