Property and equipment - Schedule of Owned Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Mar. 31, 2021
Property, Plant and Equipment [Line Items]
Less: accumulated depreciation and impairments	$ (44,637)	$ (42,955)
Owned equipment, net	22,261	17,370
Equipment, vehicles and other
Property, Plant and Equipment [Line Items]
Owned equipment, gross	7,614	6,877
In-vehicle devices
Property, Plant and Equipment [Line Items]
Owned equipment, gross	$ 59,284	$ 53,448

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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