Revenue - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Disaggregation Of Revenue [Line Items]
Revenue recognized from unreturned kits	$ 22.1	$ 27.7	$ 21.9
Revenue recognized	$ 41.1	46.6
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01
Disaggregation Of Revenue [Line Items]
Revenue recognize percentage	50.00%
Revenue, remaining performance obligation, satisfaction, period	12 months
Consumer services
Disaggregation Of Revenue [Line Items]
Deferred revenue for customer services	$ 52.3	48.6	51.3
Research services
Disaggregation Of Revenue [Line Items]
Deferred revenue for customer services	22.5	14.0	$ 11.6
Revenue recognized	13.8	9.7
Remaining performance obligations	27.5
Research services | Related Party
Disaggregation Of Revenue [Line Items]
Deferred revenue for customer services	21.0	11.8
Revenue recognized	$ 11.8	$ 9.2