Deferred revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Change in Contract with Customer Liability Roll Forward [Roll Forward]
Opening balance	$ 5,788	$ 5,077
Increases during the year	53,267	33,009
Recognized as revenue	(52,486)	(33,210)
Foreign currency translation difference	123	912
Closing balance	6,692	5,788
Revenue recognized that is included in the deferred revenue beginning balance	$ 3,800	$ 3,100