Revenue - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Revenue recognized from unreturned kits	$ 4.4	$ 6.8	$ 13.4	$ 17.8
Remaining performance obligations	$ 21.6		$ 21.6
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Disaggregation of Revenue [Line Items]
Revenue to be recognized, percentage	28.00%		28.00%
Remaining performance obligation, expected timing of satisfaction, period	12 months		12 months
Consumer services
Disaggregation of Revenue [Line Items]
Deferred revenue for customer services	$ 74.7		$ 74.7		$ 48.6
Revenue recognized	5.3		36.8
Research services
Disaggregation of Revenue [Line Items]
Deferred revenue for customer services	20.7		20.7		14.0
Revenue recognized	0.1		13.7
Research services | Related Party
Disaggregation of Revenue [Line Items]
Deferred revenue for customer services	$ 20.0		20.0		$ 11.8
Revenue recognized			$ 11.8