Revenue - Summary of Revenue by Region based on the Shipping Address of Customers (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Disaggregation Of Revenue [Line Items]
Revenue	$ 219,638	$ 299,489	$ 271,893
Revenue | Geographic Concentration Risk
Disaggregation Of Revenue [Line Items]
Concentration risk, percentage	100.00%	100.00%	100.00%
United States
Disaggregation Of Revenue [Line Items]
Revenue	$ 180,153	$ 217,242	$ 192,438
United States | Revenue | Geographic Concentration Risk
Disaggregation Of Revenue [Line Items]
Concentration risk, percentage	82.00%	73.00%	71.00%
UK
Disaggregation Of Revenue [Line Items]
Revenue	$ 24,280	$ 63,023	$ 58,477
UK | Revenue | Geographic Concentration Risk
Disaggregation Of Revenue [Line Items]
Concentration risk, percentage	11.00%	21.00%	22.00%
Canada
Disaggregation Of Revenue [Line Items]
Revenue	$ 10,565	$ 13,581	$ 14,293
Canada | Revenue | Geographic Concentration Risk
Disaggregation Of Revenue [Line Items]
Concentration risk, percentage	5.00%	4.00%	5.00%
Other regions
Disaggregation Of Revenue [Line Items]
Revenue	$ 4,640	$ 5,643	$ 6,685
Other regions | Revenue | Geographic Concentration Risk
Disaggregation Of Revenue [Line Items]
Concentration risk, percentage	2.00%	2.00%	2.00%