Summary of significant accounting policies - Schedule of Cumulative Currency Translation Adjustments (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 123,394
Foreign currency translation gains for the year, net of tax	1,984	$ 12,994	$ (13,163)
Ending balance	126,692	123,394
Cumulative Currency Translation Adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	1,924	(11,070)
Foreign currency translation gains for the year, net of tax	1,985	12,994
Ending balance	$ 3,909	$ 1,924	$ (11,070)